Global potential of soil carbon sequestration to mitigate the greenhouse effect

Critical Reviews in Plant Sciences

Volumn 22, Issue 2, 2003, Pages 151-184

  Lal, R ^a  

^a OHIO STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0037249727     PISSN: 07352689     EISSN: None     Source Type: Journal    
DOI: 10.1080/713610854     Document Type: Review

References (242)

1. Alvarez, R., Russo, M.E., Prystupa, P., Scheiner, J.D., and Blotta, L. 1998. Soil carbon pools under conventional and no-tillage systems in the Argentine Rolling Pampa. Agric. J. 90: 138-143.
2. Andrews, S.S., Mitchell, J.P., Mancinelli, R., Karlen, D.L., Hartz, T.K., Horwath, W.R., Pettygrove, G.S., Scow, K.M., and Munk, D.S. 2002. On-farm assessment of soil quality in California's central valley. Agron. J. 94: 12-23.
3. Aoyama, M. and Kumakura, N. 2001. Quantitative and qualitative changes of organic matter in an Ando soil induced by mineral fertilizer and cattle manure applications for 20 years. Soil Sci. Plant Nut. 47: 241-252.
4. Babev, A.G. (Ed.) 2000. Desert Problems and Desertification in Central Asia. Springer-Verlag, Berlin, 293pp.
5. Barber, R.G. and Navarro, F. 1994. Evaluation of the characteristics of 14 cover crops used in a soil rehabilitation trial. Land Deg. Rehab. 5: 201-214.
6. Barkle, G.F., Stenger, R., Singleton, P.L., and Painter, D.J. 2000. Effect of regular irrigation with dairy farm effluent on soil organic matter and soil microbial biomass. Aust. J. Soil Res. 38: 1087-1097.
7. Batjes, N.H. 1996. The total C and N in soils of the world. Europ. J. Soil Sci. 47: 151-163.
8. Battelle 2000. Global energy technology strategy: addressing climate change. Initial findings from an international public-private collaboration, Washington, D.C., 60pp.
9. Bayer, C., Mielniczuk, J., Amado, T.J.C., Martin-Neto, L., and Femandes, S.V. 2000. Organic matter storage in a sandy loam Acrisol affected by tillage and cropping systems in southern Brazil. Soil Till. Res. 54: 101-109.
10. Bayer, C., Martin-Neo, L., Mielniczuk, J., and Ceretta, C.A. 2000. Effect of no-till cropping systems on soil organic matter in a sandy clay loam Acrisol from Southern Brazil monitored by electron spin resonance and nuclear magnetic resonance. Soil Till. Res. 53: 95-104.
11. Bayer, C., Martin-Neto, L., Mielniczuk, J., Pillon, C.N., and Sangoi, L. 2001. Changes in soil organic matter fractions under subtropical no-till cropping systems. Soil Sci. Soc. Am. J. 65: 1473-1478.
12. Bergstrom, D.W., Monreal, C.M., and St. Jacques, E. 2001. Influence of tillage practice on carbon sequestration is scale-dependent. Can. J. Soil Sci. 81: 63-70.
13. 2 emission from mineral soils following land-cover change in Brazil. Global Change Biol. 7: 779-787.
14. Bezdicek, D.F., Papendick, R.I., and Lal, R. 1996. Importance of soil health to sustainable land management. In: Methods for Assessing Soil Quality. pp. 1-8. Doran, J.W., and Jones, A.J., Eds., Soil Sci. Soc. Am. Special Publ. #49, Madison, WI.
15. Bhojvaid, P.P. and Timmer, V.R. 1998. Soil dynamics in an age sequence of Prosopis juliflora planted for sodic soil restoration in India. For. Ecol. Manage. 106: 181-193.
16. Binder, C. and Patzel, N. 2001. Preserving tropical soil organic matter at watershed level. A possible contribution of urban organic wastes. Nut. Cycl. Agroeco. 61: 171-181.
17. 13C abundance in particle size fractions of forested and cultivated Oxisols. Soil Biol. Biochem. 24: 275-277.
18. Bordovsky, D.G., Choudhary, M., and Gerard, C.J. 1999. Effect of tillage, cropping and residue management on soil properties in the Texas Rolling Plains. Soil Sci. 164: 331-340.
19. Bowman, R.A. and Halvorson, A.D. 1998. Soil chemical changes after 9 years of differential N fertilization in a not ill dryland wheat-corn fallow rotation. Soil Sci. 163: 241-247.
20. Bowman, R.A., Vigil, M.F., Nielsen, D.C and Anderson, R.L. 1999. Soil organic matter changes in intensively cropped dryland systems. Soil Sci. Soc. Am. J. 63: 186-191.
21. Buresh, R.J. and Tian, G. 1997. Soil improvement by trees in sub-Saharan Africa. Agrofor. Syst. 38: 51-76.
22. Buringh, P. 1984. Organic carbon in soils of the world. In: The Role of Terrestrial Vegetation in the Global Carbon Cycle: Measurement by Remote Sensing. pp. 91-109. Woodwell, G.M., Ed., Wiley, New York.
23. Burke, I.C., Lauenroth, W.K., and Coffin, D.P. 1995. Soil organic matter recovery in semi-arid grasslands-implications for the conservation reserve program. Eco. Appl. 5: 793-801.
24. 13C) and nitrogen mineralization potential of particulate light soil organic matter after rainforest clearing. Soil Biol. Biochem. 28: 1555-1567.
25. Carter, M.R. 2002. Soil quality for sustainable land management: organic matter and aggregation interactions that maintain soil functions. Agron. J. 94: 38-47.
26. Cerri, C.C., Moraes, J.F.I., and Volkoff, B. 1992. Dinâmica do carbono orgânico em solos vinculados a pastagents da Amazônia Brasileira. Rev. INIA Inv. Agr. No. 1, Tomo I: 95-102.
27. Chan, K.Y., Bowman, A.M., Smith, W., and Ashley, R. 2001. Restoring soil fertility of degraded hard-setting soils in semi-arid areas with different pastures. Aust. J. Exp. Agric. 41: 507-514.
28. Chen, X.Y. 1997. Pedogenic gypcrete formation in arid central Australia. Geoderma 77: 39-61.
29. 13C isotopic composition. In: Diversity of Environmental Biogeochemistry, Berthelin, M., Ed., pp. 397-405, Elsevier, Holland.
30. Christensen, B.T. 1996. The Askov long-term experiment on animal manures and mineral fertilizers. In: Evaluation of Soil Organic Matter: Models Using Existing Datasets. pp. 301-312. Powlson, D.S., Smith, P., and Smith, J.U., Eds., Springer, Heidelberg, NATO/ASI 138.
31. Compton, J.E. and Boone, R.D. 2000. Long-term impacts of agriculture on soil carbon and nitrogen in New England forests. Ecology 81: 2314-2330.
32. Conant, R.T., Paustian, K., and Elliott, E.T. 2001. Grassland management and conversion into grassland: effects on soil carbon. Ecol. Appl. 11: 343-355.
33. Condron, L.M., Cameron, K.C., Di, H.J., Clough, T.J., Forbes, E.A., McLaren, R.G., and Silva, R.G. 2000. A comparison of soil and environmental quality under organic and conventional farming systems in New Zeal. New Zealand J. Agric. Res. 43: 443-466.
34. Curtin, D., Wang, H., Selles, F., Zentner, R.P., Biederbeck, V.O., and Campbell, C.A. 2000a. Legume green manure as partial fallow replacement in semi-arid Saskatchewan: Effect on carbon fluxes. Can. J. Soil Sci. 80: 499-505.
35. Curtin, D., Selles, F., Wang, H., Zentner, R.P., and Campbell, C.A. 2000b. Restoring organic matter in a cultivated, semi-arid soil using crested wheatgrass. Can. J. Soil Sci. 80: 429-435.
36. Curitn, D., Wang, H., Selles, F., McConkey, B.G., and Campbell, C.A. 2000c. Tillage effects on carbon fluxes in continuous wheat and fallow-wheat rotations. Soil Sci. Soc. Am. J. 64: 2080-2086.
37. Dang, N.T. and Klinnert, C. 2001. Problems with and local solutions for organic matter management in Vietnam. Nut. Cycl. Agroeco. 61: 89-97.
38. De Jong, E. and Kachanoski, R.G. 1988. The importance of erosion in the carbon balance of prairie soils. Can. J. Soil Sci. 68: 111-119.
39. Del Grosso, S., Ojima, D., Parton, W., Mosier, A., Peterson, G., and Schimel, D. 2002. Simulated effects of dryland cropping intensification on soil organic matter and greenhouse gas exchanges using the DAYCENT ecosystem model. Env. Poll. 116: S75-S83.
40. Department of Energy. 1999. Carbon Sequestration: Research and Development. Office of Science, Office of Fossil Energy, Springfield, VA.
41. Dersch, G. and Böhm, K. 2001. Effects of agronomic practices on soil carbon storage potential in arable farming in Austria. Nutr. Cycl. Agroecosys. 60: 49-55.
42. Diaz-Zorita, M. Buschiazzo, D.E., and Peinemann, N. 1999. Soil organic matter and wheat productivity in the semi-arid Argentine Pampas. Agron. J. 91: 276-279.
43. Dick, W.A., Blevins, R.L., Frye, W.W., Peters, S.E., Christenson, D.R., Pierce, F.J., and Vitosh, M.L. 1998. Impacts of agricultural management practices on C sequestration in forest-derived soils of the eastern Corn Belt. Soil Till. Res. 47: 235-244.
44. Dixon, R.K., Brown, S., Houghton, R.A., Solomon, A.M., Trexler, M.C., and Wisniewski, J. 1994. Carbon pool and flux of global forest ecosystems. Science 263: 1985-1990.
45. Doran, J.W. and Parkin, T.B. 1994. Defining and assessing soil quality. In: Defining Soil Quality for a Sustainable Environment. pp. 3-21. Doran, J.W., Coleman, D.C., Bezdicek, D.F., and Stewart, B.A., Eds., Soil Sci. Soc. Amer. Special Publ. #35, Madison, WI.
46. Drinkwater, L.E., Wagoner, P., and Sarrantonio, M. 1998. Legume-based cropping systems have reduced carbon and nitrogen losses. Nature 396: 262-265.
47. Dumanski, J., Desjardins, R.L., Tamocai, C., Montreal, C., Gregorich, E.G., Kirkwood, V., and Campbell, C.A. 1998. Possibilities for future carbon sequestration in Canadian agriculture in relation to land use changes. Climatic Change 40: 81-103.
48. Entry, J.A., Mitchell, C.C., and Backman, C.B. 1996. Influence of management practices on soil organic matter, microbial biomass and cotton yield in Alabama's "Old Rotation," Biol. Fert. Soils 23: 353-358.
49. Eswaran, H., van den Berg, E., and Reich, P. 1993. Organic carbon in soils of the world. Soil Sci. Soc. Am. J. 57: 192-194.
50. Eswaran, H., Van den Berg, E., Reich, P., and Kimble, J.M. 1995. Global soil carbon resources. In: Soils and Global Change. pp. 27-43. Lal, R., Kimble, J.M., Levine, E., and Stewart, B.A., Eds., CRC/Lewis Publishers, Boca Raton, FL.
51. 2 over the last 1000 years from air in Antarctic ice and fern. J. Geophys. Res. 101: 4115-4128.
52. Fausey, N.R. and Lal, R. 1989. Drainage-tillage effects on Crosby-Kokomo soil association in Ohio. III. Organic matter content and chemical properties. Soil Technol. 5: 1-12.
53. Feigl, B.J., Melillo, J., and Cerri, C.C. 1995. Changes in the origin and quality of soil organic matter after pasture introduction in Rondonia, Brazil. Plant Soil 175: 21-29.
54. Fernandez, P., Oliver, R., and Diatta, S. 2000. Changes in organic mater of a ferrallitic tropical soil degraded by cropping systems: the case of Southern Senegal. Arid Soil Res. Rehab. 14: 137-150.
55. Folland, C.K. and Karl, T.R. 2001. Observed climate variability and change. In: Climate Change 2001: The Scientific Basis. pp. 99-181. Intergovernmental Panel on Climate Change, Cambridge Univ. Press, U.K.
56. Follett, R.F. 2001. Soil management concepts and carbon sequestration in cropland soils. Soil Tillage Res. 61: 77-92.
57. Follett, R.F., Samson-Liebig, E., Kimble, J.M., Pruessner, E.G., and Waltman, S. 2001. Carbon sequestration under CRP in the historic grassland soils of the U.S. In: Soil Carbon Sequestration and the Greenhouse Effect. pp. 27-40. Lal, R., Ed., Soil Sci. Soc. Amer. Special Publ. #57, Madison, WI.
58. Follett, R.F., Kimble, J.M., and Lal, R. 2001. The potential of U.S. grazing lands to sequester soil carbon. In: The Potential of U.S. Grazing Land to Sequester Carbon and Mitigate the Greenhouse Effect. pp. 401-430. Follett, R.F., Kimble, J.M., and Lal, R., Eds., CRC/Lewis Publishers, Boca Raton, FL.
59. Franzluebbers, A.J., Haney, R.L., Honeycutt, C.W., Arshad, M.A., Schomberg, H.H., and Hons, F.M. 2001. Climatic influences on active fractions of soil organic matter. Soil Biol. Biochem. 33: 1103-1111.
60. Franzluebbers, A.J., Stuedemann, J.A., and Wilkinson, S.R. 2001. Bermudagrass management in the southern piedmont USA. I. Soil and surface residue carbon and sulfur. Soil Sci. Soc. Am. J. 65: 834-841.
61. Freixo, A.A., Machado, P.L.O.D., dos Santos, H.P., Silva, C.A., and Fadigas, F.D. 2002. Soil organic carbon and fractions of a Rhodic Ferralsol under the influence of tillage and crop rotation systems in southem Brazil.
62. Friedel, J.K., Langer, T., Siebe, C., and Stahr, K. 2000. Effects of long-term wastewater irrigation on soil organic matter, soil microbial biomass and its activities in central Mexico. Biol. Fert. Soils 31: 414-421.
63. Fullen, M.A. 1998. Effects of grass ley set-aside on runoff, erosion and organic matter levels in sandy soils in east Shropshire, UK. Soil Till. Res. 46: 41-49.
64. Ganry, F., Feller, C., Harmand, J.M., and Guiber, H. 2001. Management of soil organic matter in semi-arid Africa for annual cropping systems. Nut. Cycl. Agroeco. 61: 105-118.
65. Garg, V.K. 1998. Interaction of tree crops with a sodic soil environment: potential for rehabilitation of degraded environments. Land Degrad. Dev. 9: 81-93.
66. Gewin, V.L., Kennedy, A.C., Veseth, R., and Miller, B.C. 1999. Soil quality changes in eastern Washington with Conservation Reserve Program (CRP) take out. J. Soil Water Cons. 54: 432-438.
67. Gilley, J.E. and Risse, L.M. 2000. Runoff and soil loss as affected by the application of manure. Trans. ASAE 43: 1583-1588.
68. Glaser, B., Lehmann, J., Fuhrboter, M., Solomon, D., and Zech, W. 2001. Carbon and nitrogen mineralization in cultivated and natural savanna soils of Northern Tanzania. Biol. Fert. Soils 33: 301-309.
69. Govers, G., Vandaele, K., Desmet, P.J.J., Poesen, J., and Bunte, K. 1994. The role of tillage in soil redistribution on hillslopes. Europ. J. Soil Sci. 45:469-478.
70. Graham, M.H., Haynes, R.J., and Meyer, J.H. 2002. Soil organic matter content and quality: effects of fertilizer applications, burning and trash retention on a long-term sugarcane experiment in South Africa. Soil Biol. Biochem. 34: 93-102.
71. Grant, C.A., Peterson, G.A., and Campbell, C.A. 2002. Nutrient considerations for diversified cropping systems in northern Great Plains. Agron. J. 94: 186-198.
72. Gregorich, E.G. and Anderson, D.W. 1985. Effects of cultivation and erosion on soils of four toposequences in the Canadian Prairie. Geoderma 36: 343-345.
73. Gregorich, E.G., Greer, K.J., Anderson, D.W., and Liang, B.C. 1998. Carbon distribution and losses: erosion and deposition effects. Soil Till. Res. 47: 291-302.
74. Gregorich, E.G., Drury, C.F., and Baldock, J.A. 2001. Changes in soil carbon under long-term maize in monoculture and legume-based rotation. Can. J. Soil Sci. 81: 21-31.
75. Groenendijk, F.M., Condron, L.M., and Rijkse, W.C. 2002. Effects of afforestation on organic carbon, nitrogen and sulfur concentrations in New Zealand hill country soils. Geoderma 108: 91-100.
76. Guillaume, K., Abbadie, L., Mariotti, A., and Nacro, H. 1999. Soil organic matter dynamics in tiger bush (Niamey, Niger). Preliminary results. Acta Oecologica-International J. Ecol. 20: 185-195.
77. Gupta, R.K. and Abrol, I.P. 1990. Salt-affected soils: their reclamation and management for crop production. Adv. Soil Sci. 11: 224-288.
78. Gupta, R.K. and Rao, D.L.N. 1994. Potential of wastelands for sequestering carbon by reforestation. Curr. Sci. 66: 378-380.
79. Hairiah, K., Van Noordwijk, M., and Cadisch, G. 2000. Crop yield, C and N balance of three types of cropping systems on an Ultisol in Northern Lampung. Netherlands J. Agric. Sci. 48: 3-17.
80. Halman, M.M. and Steinberg, M. 1999. Greenhouse Gas Carbon Dioxide Mitigation: Science and Technology. Lewis Publishers, Boca Raton, FL: 568pp.
81. Hao, X., Change, C., and Lindwall, C.W. 2001. Tillage and crop sequence effects on organic carbon and total nitrogen content in an irrigated Alberta soil. Soil Till. Res. 62: 167-169.
82. Harvell, C.D., Mitchell, C.E., Ward, J.R., Altizer, S., Dobson, A.P., Ostfeld, R.S., and Samuel, M.D. 2002. Climate warming and disease risks for terrestrial and marine biota. Science 296: 2158-2162.
83. Havlin, J.L., Kissel, D.E., Maddux, L.D., Claassen, M.M., and Long, J.H. 1990. Crop rotation and tillage effects on soil organic carbon and nitrogen. Soil Sci. Soc. Am. J. 54: 448-452.
84. Himes, F.L. 1998. Nitrogen, sulfur and phosphorus and the sequestering of carbon. In: Soil Processes and the Carbon Cycle, pp. 315-319, Lal, R., Kimble, J.M., Follett, R.F., and Stewart, B.A., Eds., CRC, Boca Raton, FL.
85. Hobbs, P.R., Tiri, G.S., and Grace, P. 1997. Reduced and zero tillage options for the establishment of wheat after rice in South Asia. Rice-Wheat Consortium Paper #2, CIMMYT, Mexico.
86. Houghton, R.A. 1999. Changes in the storage of terrestrial carbon since 1850. In: Soils and Global Change. pp. 45-65. Lal, R., Kimble, J.M., Levine, E., and Stewart, B.A., Eds., CRC/Lewis Publishers, Boca Raton, FL.
87. Houghton, R.A. 1999. The annual net flux of carbon to the atmosphere from changes in land use 1850 to 1990. Tellus 50B: 298-313.
88. Houghton, R.A., Hackler, J.L., and Lawrence, K.T. 1999. The U.S. carbon budget: contributions from land use change. Science 285: 574-578.
89. Houghton, R.A., Lawrence, K.T., Hackler, J.L., and Brown, S. 2001. The spatial distribution of forest biomass in the Brazilian Amazon: A comparison of estimates. Global Change Biol. 7: 731-746.
90. Intergovernmental Panel on Climate Change 1995. Climate Change 1995: Impact, Adaptations and Mitigation of Climate Change: Scientific Technical Analyses. Working Group 1, Cambridge Univ. Press, Cambridge, U.K.
91. Intergovernmental Panel on Climate Change 2000. Land Use, Land Use Change and Forestry. Special Report, Cambridge Univ. Press, Cambridge, U.K.
92. Intergovernmental Panel on Climate Change 2001. Climate Change: The Scientific Basis. Cambridge Univ. Press, Cambridge, U.K.
93. Izaurralde, R.C., McGill, W.B., Robertson, J.A., Juma, N.G., and Thurston, J.J. 2001. Carbon balance of the Breton Classical Plots over half a century. Soil Sci. Soc. Am. J. 65: 431-441.
94. Jackson, R.B., Banner, J.L., Jobbagy, E.B., Pockman, W.T., and Wall, D.H. 2002. Ecosystem carbon loss with woody plant invasion of grasslands. Nature 418: 623-626.
95. Jenkinson, D.S. 1990. The turnover of organic carbon and nitrogen in soil. Phil. Trans. Royal Soc. London Bull. 329: 361-368.
96. 14carbon labeled plant material under tropical conditions. Soil Sci. Soc. Am. J. 41: 912-915.
97. Jenny, H. 1941. Factors of Soil Formation: A System of Quantitative Pedology. McGraw-Hill Book Co., Inc., New York, 281pp.
98. Jenny, H. 1980. Soil Resource: The Origin and Behavior. Ecol. Studies 37, Springer Verlag, New York.
99. Jenny, H. and Raychaudhuri, S.P. 1960. Effect of Climate and Cultivation on Nitrogen and Organic Matter Reserves in Indian Soils. ICAR, New Delhi, India.
100. Kay, B.D. 1998. Soil structure and organic carbon: a review. In: Soil Processes and the Carbon Cycle, pp. 169-197, Lal, R., Kimble, J.M., Follett, R.F., and Stewart, B.A., Eds, CRC Press, Boca Raton, FL.
101. 2 records from sites in S10 air sampling network. In: Trends: A Compendium of Data on Global Change. Carbon Dioxide Information Analysis Center, Oakridge National Laboratory, Oakridge, TN, USA.
102. Khokhlova, O.S., Arlashina, E.A., and Kovalevskaya, I.S. 1997. The effect of irrigation on the carbonate status of Chernozems of Central Precaucasus (Russia). Soil Tech. 11: 171-184.
103. Knuteson, J.A., Richardson, J.L., Patterson, D.D., and Prunty, L. 1989. Pedogenic carbonates in a Calciaquoll associated with a recharge wetland. Soil Sci. Soc. Am. J. 53: 495-499.
104. Kolka, R.K., Nelson, E.A., and Trettin, C.C. 2000. Conceptual assessment framework for forested wetland restoration: the Pen Branch experience. Ecol. Eng. 15: S17-S21.
105. Korschens, M. and Muller, A. 1996. The static experiment at Bad Lauchst, Germany. In: Evaluation of Soil Organic Matter: Models Using Existing Datasets. pp. 369-378. Powlson, D., Smith, P., and Smith, J.U., Eds., Springer Heidelberg, NATO ASI 138.
106. Koutika, L.S., Hauser, S., and Henrot, J. 2001. Soil organic matter assessment in natural regrowth, Pueraria phaseoloids and Mucuna pruriens fallow. Soil Bio. Biochem. 33: 1095-1101.
107. Kucharik, C.J., Brye, K.R., Norman, J.M., Foley, J.A., Gower, S.T., and Bundy, L.G. 2001. Measurements and modeling of carbon and nitrogen cycling in agroecosystems of southern Wisconsin: potential for SOC sequestration during the next 50 years. Ecosystems 4: 237-258.
108. Kundu, S., Singh, M., Saha, J.K., Biswas, A., Tripathi, A.K., and Acharya, C.L. 2001. Relationship between C addition and storage in a Vertisol under soybean-wheat cropping system in subtropical central India. J. Plant Nut. Soil Sci. 164: 483-486.
109. Kushwaha, C.P., Tripathi, S.K., and Singh, K.P. 2001. Soil organic matter and water-stable aggregates under different tillage and residue conditions in a tropical dryland agroecosystem. Appl. Soil Ecol. 16: 229-241.
110. Lal, R. 1976. Soil Erosion Problems on Alfisols in Western Nigeria and Their Control. IITA Monograph 1, IITA, Ibadan, Nigeria, 208pp.
111. Lal, R. 1997a. Degradation and resilience of soils. Phil. Trans. Royal Soc. London B. 352: 957-1010.
112. 2 enrichment. Soil Tillage Res. 43: 81-107.
113. Lal, R. 1999. Soil management and restoration for C sequestration to mitigate the accelerated greenhouse effect. Prog. Env. Sci. 1: 307-326.
114. Lal, R. 2000. World cropland soils as a source or sink for atmospheric carbon. Adv. Agron. 71: 145-191.
115. Lal, R. 2001. Potential of desertification control to sequester carbon and mitigate the greenhouse effect. Climate Change 15: 35-72.
116. Lal, R. 2002. The potential of soils of the tropics to sequester carbon and mitigate the greenhouse effect. Adv. Agron. 74: 155-192.
117. Lal, R. and Kimble, J.M. 2000. Pedogenic carbonates and the global carbon cycle. In: Global Climate Change and Pedogenic Carbonates, pp. 1-13, Lal, R., Kimble, J.M., Eswaran, H., and Stewart, B.A., Eds., CRC/Lewis Publishers, Boca Raton, FL.
118. Lal, R., Hall, G.F., and Miller, F.P. 1989. Soil degradation. I. Basic processes. Land Degrad. Rehab. 1: 51-69.
119. Lal, R., Blum, W.H., Valentine, C., and Stewart, B.A., Eds. 1998. Methods for Assessment of Soil Degradation. pp. 558. CRC/Lewis Publishers, Boca Raton, FL.
120. Lal, R., Follett, R.F., Kimble, J.M., and Cole, C.V. 1999. Managing U.S. cropland to sequester C in soil. J. Soil Water Conserv. 54: 374-381.
121. Lal, R. and Bruce, J.P. 1999. The potential of world cropland soils to sequester C and mitigate the greenhouse effect. Env. Sci. Policy 2: 177-185.
122. Larson, W.E. and Robert, P.C. 1991. Farming by soil. In: Soil Management for Sustainability, pp. 103-111, Lal, R. and Pierce, F.J., Eds, Soil Water Conserv. Soc., Ankeny, IA.
123. Lavelle, P. 2000. Ecological challenges for soil science. Soil Sci. 165: 73-86.
124. Leiva, F.R., Morris, J., and Blackmore, B.S. 1997. Precision farming techniques for sustainable agriculture. Proc. First European Conference on Precision Agriculture, Warwick, Sept. 8-10, 1997: 957-966.
125. Lilienfein, J., Wilcke, W., Thomas, R., Vilela, L., Lima, S.D.C., and Zech, W. 2001. Effects of Pinus caribaea forests on the C, N, P and S status of Brazilian savanna Oxisols. Forest Ecol. Manage. 147: 171-182.
126. Lindstrom, M.J., Nelson, W.W., and Schumacher T.E. 1992. Quantifying tillage erosion rates due to moldboard plowing. Soil Tillage Res. 24: 243-255.
127. Lobb, D.A. and Kachanoski, R.G. 1999. Modelling tillage translocation using steppe, near plateau, and exponential functions. Soil Tillage Res. 51:261-277.
128. Lobb, D.A., Kachanoski, R.J., and Miller, M.H. 1995. Tillage translocation and tillage erosion on shoulder slope landscape positions measured using 137cesium as a tracer. Can. J. Soil Sci. 75: 211-218.
129. Lobe, I., Amelung, W., and DuPreez, C.C. 2001. Losses of carbon and nitrogen with prolonged arable cropping from sandy soils of the South African Highveld. Eur. J. Soil Sci. 52: 93-101.
130. Lugo, A.E. and Brown, S. 1993. Management of tropical soils as sinks or sources of atmospheric carbon. Plant Soil 149: 27-41.
131. Luizao, R.C.C., Bonde, T.A., and Rosswell, T. 1992. Seasonal variation of soil microbial biomass: the effects of clearing a tropical rainforest and establishment of pasture in the Central Amazon. Soil Biol. Biochem. 24: 805-813.
132. Lulu, B. and Insam, H. 2000. Effects of cropping systems and manuring on soil microbial and C status of a Vertisol in Ethiopia. Bodenkultur 51: 107-114.
133. Machado, P.L.O.D., and Silva, C.A. 2001. Soil management under no tillage systems in the tropics with special reference to Brazil. Nut. Cycl. Agroeco. 61: 119-130.
134. Mäder, P., Fließach, A., Dubois, D., Gunst, L., Fried, P., and Niggli, U. 2002. Soil fertility and biodiversity in organic farming. Science 296: 1694-1697.
135. Malhi, S.S., Nyberg, M., Harpiak, J.T., Heier, K., and Flore, N.A. 1997. Increasing organic carbon and nitrogen under brome grass with long-term N fertilization. Nutr. Cycl. Agroeco. 49: 155-160.
136. 2 emission estimates from fossil fuel burning, cement production and gas flaring, 1751-1996. Report NDP-030, Carbon Dioxide Information Analysis Center, Oakridge National Laboratory, Oakridge, TN, USA.
137. Marquez, C.O., Cambardella, C.A., Isenhart, T.M., and Schultz, R.C. 1998. Assessing soil quality in a riparian buffer by testing organic matter fractions in central Iowa, USA. Agrofor. Syst. 44: 133-140.
138. Mendes, I.C., Bandick, A.K., Dick, R.P., and Bottomley, P.J. 1999. Microbial biomass and activities in soil aggregates affected by winter cover crops. Soil Sci. Soc. Am. J. 63: 873-881.
139. Mitchell, C.C. and Entry, J.A. 1998. Soil C, N and crop yields in Alabama's long-term 'Old rotation' cotton experiment. Soil Till. Res. 47: 331-338.
140. 2 sequestration. In: Global Climate Change and Pedogenic Carbonates, pp. 273-289, Lal, R., Kimble, J.M., Eswaran, H., and Stewart, B.A., Eds., CRC/Lewis Publishers, Boca Raton, FL.
141. Monreal, C.M., Zentner, R.P., and Robertson, J.A. 1997. An analysis of soil organic matter dynamics in relation to management, erosion and yield of wheat in long-term crop rotation plots. Can. J. Soil Sci. 77: 553-563.
142. Moraes, J.L., Cerri, C.C., Melillo, J.M., Kicklighter, D., Neill, C., Skola, D.L., and Steudler, P.A. 1995. Soil carbon stocks of the Brazilian Amazon Basin. Soil Sci. Soc. Am. J. 59: 244-247.
143. 2O emissions through the agricultural nitrogen cycle - OECD/IPCC/IEA Phase II development of IPCC guidelines for national greenhouse gas inventory methodology. Nutrient Cycling in Agroecosystems 52: 225-248.
144. Mrabet, R., Saber, N., El-Brahli, A., Lahlou, S., and Bessam, F. 2001. Total, particulate organic matter and structural stability of a Calcixeroll soil under different wheat rotations and tillage systems in a semi-arid area of Morocco. Soil Till. Res. 57: 225-235.
145. N'Dayegamiye, A. and Tran, T.S. 2001. Effects of green manures on soil organic matter and wheat yields and N nutrition. Can. J. Soil Sci. 81: 371-382.
146. 4 from rice fields. IG Activities newsletter 12: 3-11.
147. Neufeldt, H., Resck, D.V.S., and Ayarza, M.A. 2002. Texture and land use effects on soil organic matter in Cerrado Oxisols, central Brazil. Geoderma 107: 151-164.
148. Nordt, L.C., Wiliding, L.P., and Drees, L.R. 2000. Pedogenic carbonate transformations in leaching soil systems: implications for the global carbon cycle. In: Global Climate Change and Pedogenic Carbonates, pp. 43-63, Lal, R., Kimble, J.M., Eswaran, H., and Stewart, B.A., Eds., CRC/Lewis Publishers, Boca Raton, FL.
149. Novotny, E.H., Blum, W.E.H., Gerzabek, M.H., and Mangrich, A.S. 1999. Soil management system effects on size fractionated humic substances. Geoderma 92: 87-109.
150. Nowak, D.J. 1993. Atmospheric carbon reduction by atmospheric trees. J. Environ. Manage. 37: 207-212.
151. Nowak, D.J. and Crane, D.E. 2002. Carbon storage and sequestration by urban trees in the USA. Environ. Pollut. 116: 381-389.
152. Nyakatawa, E.Z., Reddy, K.C., and Sistani, K.R. 2001. Tillage, cover cropping and poultry letter effects on selected soil chemical properties. Soil Till Res. 58: 69-79.
153. st Century. Springer-Verlag, Berlin.
154. Odell, R.T., Meisted, S.W., and Walker, W.M. 1984. Changes in organic carbon and nitrogen of Morrow plots soils under different treatments. 1904-1973. Soil Sci. 137: 160-171.
155. Oldeman, L.R. 1994. The global extent of soil degradation. In: Soil Resilience and Sustainable Land Use. pp. 99-118. Greenland, D.J. and Szabolcs, I., Eds., CAB Intl., Wallingford, U.K.
156. Palm, C.A., Giller, K.E., Mafongoya, P.L., and Swift, M.J. 2001. Management of organic matter in the tropics: translating theory into practice. Nut. Cycl. Agroeco. 61: 63-75.
157. Papendick, R.I. and Parr, J.F. 1997. No till farming: the way of the future for a sustainable dryland agriculture. Annals Arid Zone 36: 193-208.
158. 14C abundance. Geoderma 104: 239-256.
159. 2 emissions. Soil Use Manage. 13: 230-244.
160. Peck, T.R. 1989. Morrow plots-long term University of Illinois field research plots 1876-present. In: Proceedings of the Sanborn Field Centennial: A celebration of 100 years of agricultural research, pp. 49-52, Brown, J.R., Ed., Presented June 27, 1989 at the Jesse Wrench auditorium, Univ. of Missouri, Columbia, Publ. SRA15.
161. Poesen, J., Wesenael, B., Govers, O., Martinez-Fernadez, J., Desmet, B., Vandaele, K., Quine, T., and Degraer, G. 1997. Patterns of rock fragment covered generated by tillage erosion. Geomorphology 18: 193-197.
162. Post, W.M. and Kwon, K.C. 2000. Soil carbon sequestration and land-use change: processes and potential. Global Change Biol. 6: 317-327.
163. Postel, S. 1999. Pillars of Sand: Can the Irrigation Miracle Last? W.W. Norton, New York.
164. Pouyat, R., Groffman, P., Yesilonis, I., and Hernandez, L. 2002. Soil carbon pools and fluxes in urban ecosystems. Env. Poll. 116: S107-S118.
165. Prather, M. and Ehhalt, D. 2001. Atmospheric chemistry and greenhouse gases. In: Climate Change 2001: The Scientific Basis. pp. 239-287. Intergovernmental Panel on Climate Change, Cambridge Univ. Press, U.K.
166. Prentice, I.C. 2001. The carbon cycle and the atmospheric carbon dioxide. In: Climate Change 2001: The Scientific Basis. pp. 204-237. Intergovernmental Panel on Climate Change, Cambridge Univ. Press, U.K.
167. Pulleman, M.M., Bouma, J., van Essen, E.A., and Meijles, E.W. 2000. Soil organic matter content as a function of different land use history. Soil Sci. Soc. Am. J. 64: 689-693.
168. Quansah, C., Drechsel, P., Yirenkyi, B.B., and Asante-Mensah, S. 2001. Farmers' perceptions and management of soil organic matter - a case study from west Africa. Nut. Cycl. Agroeco. 61: 205-213.
169. Rabenhorst, M.C., Wilding, L.P., and West, L.T. 1984. Identification of pedogenic carbonates using stable carbon isotope and microfabric analyses. Soil Sci. Soc. Am. J. 48: 125-131.
170. Ramaswamy, V. 2001. Radiative forcing of climate change. In: Climate Change 2001: The Scientific Basis, pp. 349-416, IPCC, Cambridge Univ. Press.
171. Rasmussen, P.E. and Smiley, R.W. 1989. Long-term management effects on soil productivity and crop yield in semi-arid regions of eastern Oregon. Station Bull. 675. USDA-Agriculture Research Service and Agriculture Experiment Station, Oregon State University. 58 pages.
172. Rasmussen, P.E. and Parton, W.J. 1994. Long-term effects of residue management in wheat-fallow. I. Inputs, yield and soil organic matter. Soil Sci. Soc. Am. J. 58: 523-S30.
173. Rasmussen, P.E., Goulding, K.W.T., Brown, J.R., Grace, P.R., Janzen, H.H., and Körschens, M. 1998. Long-term agroecosystems experiments: assessing agricultural sustainability and global change. Science 282: 893-896.
174. Reeder, J.D., Schuman, G.E., and Bowman, R.A. 1998. Soil C and N changes on conservation reserve program lands in the Central Great Plains. Soil Till. Res. 47: 339-349.
175. Reicosky, D.C., Reeves, D.W., Prior, S.A., Runion, G.B., Rogers, H.H., and Raper, R.L. 1999. Effects of residue management and controlled traffic on carbon dioxide and water loss. Soil Till Res. 52: 153-165.
176. Rengasamy, P. 1998. Sodic soils. In: Methods for Assessment of Soil Degradation, pp. 265-276, Lal, R., Blum, W.H., Valentine, C., and Stewart, B.A., Eds., CRC/Lewis Publishers, Boca Raton, FL.
177. Ridley, A.M., Slattery, W.J., Helyer, K.R., and Cowling, A. 1990. The
178. Rillig, M.C., Wright, S.F., Allen, M.F., and Field, C.B. 1999. Rise in carbon dioxide changes soil structure. Nature 400: 628.
179. Rillig, M. C., Wright, S.F., and Eviner, V.T. 2002. The role of arbuscular mycorrhizal fungi and glomalin in soil aggregation: comparing effects of five plant species. Plant Soil 238: 325-333.
180. Rillig, M.C., Wright, S.F., Kimball, B.A., Pinter, P.J., Wall, G.W., Ottman, M.J., and Leavitt, S.W. 2001. Elevated carbon dioxide and irrigation effects on water stable aggregates in a Sorghum field: a possible role for arbuscular mycorrhizal fungi. Global Change Biol. 7: 333-337.
181. 2 spring in New Zealand supports the resource-balance model. Ecol. Lett. 3: 475-478.
182. 137cesium to estimate erosion rates for understanding soil carbon loss on long-term experiments at Pendleton, Oregon. Land Deg. Dev. 11: 75-81.
183. Robertson, G.P., Paul, E.A., and Harwood, R.R. 2000. Greenhouse gases in intensive agriculture: contributions of individual gases to radiative forcing of the atmosphere. Science 289: 1922-1925.
184. Robinson, C.A., Cruse, R.M., and Ghaffarzadeh, M. 1996. Cropping system and nitrogen effects on Mollisol organic carbon. Soil Sci. Soc. Am. J. 60: 264-269.
185. Robles, M.D. and Burke, I.C. 1997. Legume, grass and conservation reserve program effects on soil organic matter recovery. Ecol. Appl. 7: 345-357.
186. Robles, M.D. and Burke, I.C. 1998. Soil organic matter recovery on conservation reserve program fields in southeastern Wyoming. Soil Sci. Soc. Am. J. 62: 725-730.
187. Roose, E. and Barthes, B. 2001. Organic matter management for soil conservation and productivity restoration in Africa: a contribution from Francophone research. Nut. Cycl. Agroeco. 61: 159-170.
188. Sa, J.C. de M., Cerri, C.C., Dick, W.A., Lal, R., Filho, S.P.V., Piccolo, M.S., and Fiegl, B.V. 2001. Organic matter dynamics and carbon sequestration rates in a no-tillage chronosequence in a Brazilian Oxisol. Soil Sci. Soc. Am. J. 65: 1486-1499.
189. Sainju, U.M., Singh, B.P., and Yaffa, S. 2002. Soil organic matter and tomato yield following tillage, cover cropping and nitrogen fertilization. Agric. J. 94: 594-602.
190. 4 from rice fields: national, regional and global budgets. J. Geophys. Res. 104: 26943-26951.
191. 2 emissions and C sequestration by agriculture - perspectives and limitations. Nut. Cycl in Agroeco. 60: 253-266.
192. Schaetzl, R.J., Frederick, W.E., and Tomes, L. 1996. Secondary carbonates in three fine and fine loamy Alfisols in Michigan. Soil Sci. Soc. Am. J. 60: 1862-1870.
193. Schimel, D.S. 1995. Terrestrial ecosystems and the carbon cycle. Global Change Biol. 1: 77-91.
194. Schjonning, P., Christensen, B.T., and Christensen, B. 1994. Physical and chemical properties of a sandy loam soil receiving animal manure, mineral fertilizer or no fertilizer for 90 years. Eur. J. Soil Sci. 45: 257-268.
195. Schlesinger, W.H. 1995. Soil respiration and changes in soil carbon stocks. In: Biotic Feedback in Global Climatic System: Will the Warming Feed the Warming? pp. 159-168, Woodwell, G.M. and Mackenzie, F.T., Eds., Oxford Univ. Press, New York.
196. Schlesinger, W.H. 1997. Biogeochemistry: An Analysis of Global Change. 2nd ed., Academic Press, San Diego, CA, 588pp.
197. Schlesinger, W.H. 2000. Carbon sequestration in soils: some cautions amidst optimism. Agric. Eco. Env. 82: 121-127.
198. Schlesinger, W.H. 2000. Soil respiration and the global carbon cycle. Biogeochemistry 48: 7-20.
199. Schlesinger, W.H. and Andrews, J.A. 2000. Soil respiration and the global carbon cycle. Biogeochemistry 48: 7-20.
200. Schumacher, T.E., Lindstrom, M.J., Schumacher, J.A., and Lemme, O.O. 1999. Modelling spatial variation and productivity due to tillage and water erosion. Soil Tillage Res. 51: 331-339.
201. Shang, C. and Tiessen, H. 1997. Organic matter lability in a tropical Oxisol: evidence from shifting cultivation, chemical oxidation, particle size density and magnetic fractionations. Soil Sci. 162: 795-807.
202. Shang, C. and Tiessen, H. 1998. Organic mater stabilization in two semi-arid tropical soils: size, density and magnetic separations. Soil Sci. Soc. Am. J. 62: 1247-1257.
203. Sharma, R. and Tandon, S.K. 1983. Comparative petrology of pedogenic carbonates from quarternary deposits of Kashmir and Rajisthan. J. Geol. Soc. India 24: 399-403.
204. Shaver, T.M., Peterson, G.A., Ahuja, L.R., Westfall, D.G., Sherrod, L.A., and Dunn, G. 2002. Surface soil physical properties after twelve years of dryland no till management. Soil Sci. Soc. Am. J. 66: 1296-1303.
205. Shen, H., Xu, Z.H., and Yan, X.L. 2001. Effect of fertilization on oxidizable carbon, microbial biomass carbon, and mineralizable carbon under different agroecosystems. Comm. Soil Sci. Plant Anal. 32: 1575-1588.
206. Silver, W.L., Neff, J., McGroddy, M., Veldkamp, E., Keller, M., and Cosme, R. 2000. Effects of soil texture on below ground carbon and nutrient storage in a lowland Amazonian forest ecosystem. Ecosystems 3: 193-209.
207. Skjemstad, J.O., Dalal, R.C., Janik, L.J., and McGowan, J.A. 2001. Changes in chemical nature of soil organic carbon in Vertisols under wheat in southeastern Queensland. Aust. J. Soil Res. 39: 343-359.
208. Skjemstad, J.O., Reicosky, D.C., Wilts, A.R., and McGowan, J.A. 2002. Charcoal carbon in U.S. agricultural soils. Soil Sci. Soc. Am. J. 66: 1949-1255.
209. SkØien, S. 1993. Long-term effects of crop rotation, manure and straw on soil aggregation. Norw. J. Agric. Sci. 7: 231-247.
210. Smaling, E.M.A. 1993. Soil nutrient depletion in sub-Saharan Africa. In: The Role of Plant Nutrients for Sustainable Food Crop Production in sub-Saharan Africa, pp. 53-67, van Reuler, H. and Prins, W.H., Eds., Vereniging Van Kunstmest-Producenten, Leidschendam, The Netherlands.
211. Smith, P., Powlson, D.S., Glendining, M.J., and Smith, J.U. 1997. Potential for carbon sequestration in European soils: preliminary estimates for five scenarios using results from long-term experiments. Global Change Biol. 3: 67-79.
212. Smith, S.V., Renwick, W.H., Buddemeier, R.W., and Crossland, C.J. 2001. Budgets of soil erosion and deposition for sediments and sedimentary organic carbon across the conterminous United States. Global Biogeochem. Cycl. 15: 697-707.
213. Sokolov, V.I. 1999. Integrated water resources management in the Republic of Uzbekistan. International Water Resources Association. Water Int. 24: 104-115.
214. Sommer, R., Denich, M., and Vlek, P.L.G. 2000. Carbon storage and root penetration in deep soils under small-farmer land-use systems in the Eastern Amazon region. Plant Soil 219: 231-241.
215. Sommerfeldt, T.G., Chang, C., and Entz, T. 1988. Long-term annual manure applications increase soil organic matter and nitrogen and decrease carbon to nitrogen ratio. Soil Sci. Soc. Am. J. 52: 1668-1672.
216. Squires, V.R., Glenn, E.P., and Ayoub, A.T., Eds. 1995. Combating Global Climate Change by Combating Land Degradation. UNEP, Nairobi, Kenya, 347pp.
217. Stallard, R.F. 1998. Terrestrial sedimentation and the carbon cycle: coupling weathering and erosion to carbon burial. Global Biogeochem. Cycles 12: 231-257.
218. Sullivan, M., Fausey, N.R., and Lal, R. 1998. Long-term effects of sub-surface drainage on soil organic carbon content and infiltration in the surface horizons of a lakebed soil in northwest Ohio. In: Management of Carbon Sequestration in Soil, pp. 73-82, Lal, R., Kimble, J.M., Follett, R.F., and Stewart, B.A., Eds., CRC/Lewis Publishers, Boca Raton, FL.
219. Swarup, A., Manna, M.C., and Singh, G.B. 2000. Impact of land use and management practices on organic carbon dynamics in soils of India. In: Global Climate Change and Tropical Ecosystems, pp. 261-281, Lal, R., Kimble, J.M., and Stewart, B.A., Eds., CRC/Lewis Publishers, Boca Raton, FL.
220. Swift, R.S. 2001. Sequestration of carbon by soil. Soil Sci. 166: 858-871.
221. 2 driven by temperature change. Science 272: 393-396.
222. Uhlen, G. and Tveitnes, S. 1995. Effect of long-term crop rotations, fertilizer, farm manure and straw on soil productivity. II. Mineral composition of plants, nutrient balances and effect on soil. Norw. J. Agric. Sci. 9: 143-161.
223. Uri, N.D. 2001. Conservation practices in US agriculture and their impact on carbon sequestration. Env. Monit. Assess. 70: 323-344.
224. Van den Bygaart, A.J., Yang, X.M., Kay, B.D., and Aspinall, J.D. 2002. Variability in carbon sequestration potential in no till soil landscapes of southern Ontario. Soil Till. Res. 65: 231-241.
225. 2 concentrations: isotopic evidence after 4 years. Global Change Biol. 6: 435-444.
226. Vanotti, M.B., Bundy, L.G., and Peterson, A.E. 1997. Nitrogen fertilizer and legume cereal rotation effects on soil productivity and organic matter dynamics in Wisconsin. In: Soil Organic Matter in Temperate Agroecosystems: Long-Term Experiments in North America, pp. 105-119, Paul, E.A. et al., Eds., CRC Press, Boca Raton, FL.
227. Vitosh, M.L., Lucas, R.E., and Silva, G.H. 1997. Long-term effects of fertilizer and manure on corn yield, soil carbon and other soil chemical properties in Michigan. In: Soil Organic Matter in Temperate Agroecosystems: Long-Term Experiments in North America, pp. 129-139, Paul, E.A. et al., Eds., CRC Press, Boca Raton, FL.
228. Wagner, G.H. 1959. Lessons in soil organic matter from Sanborn field. In: Proceedings of the Sanborn Field Centennial: A celebration of 100 years of agricultural research, pp. 64-70, Brown, J.R. Ed., Presented June 27, 1989 at the Jesse Wrench auditorium, Univ. of Missouri, Columbia. Pubi. SR-415.
229. Wagner, G.H. 1981. Humus under different long-term cropping Systems. Colloque Humus-Azote p.23-29. Presented in Reims, France.
230. Wallace, A. 1994. Soil organic matter must be restored to near original levels. Comm. Soil Sci. Plant Analyses 25: 29-35.
231. Wander, M.M., Bidar, M.G., and Aref, S. 1998. Tillage impacts on depth distribution of total and particulate organic matter in three Illinois soils. Soil Sci. Soc. Am. J. 62: 1704-1711.
232. Waters, A.G. and Oades, G.M. 1991. Organic matter in water stable aggregates. In: Advances in Soil Organic Matter Research: The Impact of Agriculture and the Environment, pp. 163-174, Wilson, W.S., Ed., Roy. Soc. Chem., Cambridge, U.K.
233. West, T.O. and Marland, G. 2002. Net carbon flux from agricultural ecosystems: methodology for full carbon cycle analyses. Env. Poll. 116: 439-444.
234. Wienhold, B.J. and Tanaka, D.L. 2001. Soil property changes during conversion from perennial vegetation to annual cropping. Soil Sci. Soc. Am. J. 65: 1795-1803.
235. Wilding, L.P. 1999. Comments on paper by R. Lal. In: Carbon Sequestration in Soils: Science, Monitoring and Beyond, pp. 146-149, Rosenberg, N.A., Izaurralde, R.C., and Malone, E.L., Eds., Battelle Press, Columbus, OH.
236. Wilson, T.C., Paul, E.A., and Harwood, R.R. 2001. Biologically active soil organic matter fractions in sustainable cropping systems. Appl. Soil Ecol. 16: 63-76.
237. Witter, E., Mortensson, A.M., and Garcia, F.V. 1993. Size of the microbial mass in a long-term field experiment as affected by different N fertilizers and organic manures. Soil Biol. Biochem. 28: 659-669.
238. Wright, S. F. and Upadhyaya, A. 1998. A survey of soils for aggregate stability and glomalin, a glycoprotein produced by hyphae of arbuscular mycorrhizal fungi. Plant Soil 198: 97-107.
239. Wright, S.F., Starr, J.L., and Paltineanu, I.C. 1999. Changes in aggregate stability and concentration of glomalin during tillage management transition. Soil Sci. Soc. Am. J. 63: 1825-1829.
240. Wright, S F. and Anderson, R.L. 2000. Aggregate stability and glomalin in alternative crop rotations for the central Great Plains. Biol. Fert. Soils 31: 249-253.
241. Zaujec, A. 2001. Soil organic matte as indicator of soil quality and human influences on agroecosystem and natural forest ecosystem. Ekologia-Bratislava 20: 133-139.
242. Zech, W. and Guggenberger, G. 1996. Organic matter dynamics in forest soils of temperate and tropical ecosystems. In: Humic Substances in Terrestrial Ecosystems, pp. 101-170, Piccolo, A., Ed., Elsevier Science, Amsterdam, The Netherlands.