Soil carbon pools in california's annual grassland ecosystems

Rangeland Ecology and Management

Volumn 63, Issue 1, 2010, Pages 128-136

  Silver, Whendee L ^a   Ryals, Rebecca ^a   Eviner, Valerie ^b  

^a UNIVERSITY OF CALIFORNIA   (United States)

^b UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

annual grassland; climate change; Mediterranean climate; oak woodland; soil carbon sequestration

Indexed keywords

CARBON SEQUESTRATION; CLIMATE CHANGE; DECIDUOUS FOREST; GRASS; GRASSLAND SOIL; GRAZING MANAGEMENT; GREENHOUSE GAS; LIFE HISTORY; MEDITERRANEAN ENVIRONMENT; PERENNIAL PLANT; RANGELAND; SOIL CARBON; SOIL EMISSION; WOODLAND;

CALIFORNIA; UNITED STATES;

POACEAE;

EID: 79952166918     PISSN: 15507424     EISSN: None     Source Type: Journal    
DOI: 10.2111/REM-D-09-00106.1     Document Type: Article

References (99)

1. BAISDEN, W. T., R. AMUNDSON, D. L. BRENNER, A. C. COOK, C. KENDALL, AND J. W. HARDEN. 2002a. A multiisotope C and N modeling analysis of soil organic matter turnover and transport as a function of soil depth in a California annual grassland soil chronosequence. Global Biogeochemical Cycles 16:1135.
2. BAISDEN, W. T., R. AMUNDSON, A. C. COOK, AND D. L. BRENNER. 2002b. Turnover and storage of C and N in five density fractions from California annual grassland surface soils. Global Biogeochemical Cycles 16:1117.
3. BAISDEN, W. T., AND R. L. PARFITT. 2007. Bomb C-14 enrichment indicates decadal C pool in deep soil? Biogeochemistry 85:59-68. (Pubitemid 47036791)
4. BALESDENT, J., AND M. BALABANE. 1996. Major contribution of roots to soil carbon storage inferred from maize cultivated soils. Soil Biology and Biochemistry 28:1261-1263. (Pubitemid 27088480)
5. BARTOLOME, J. W., R. D. JACKSON, A. D. K. BETTS, J. M. CONNOR, G. A. NADER, AND K. W. TATE. 2007. Effects of residual dry matter on net primary production and plant functional groups in Californian annual grasslands. Grass and Forage Science 62:445-452. (Pubitemid 350125985)
6. BETTS, K. 2003. Demonstrating carbon sequestration. Environmental Science & Technology 37:354A-355A. (Pubitemid 37259600)
7. BOND, W. J., AND J. E. KEELEY. 2005. Fire as a global 'herbivore': the ecology and evolution of flammable ecosystems. Trends in Ecology and Evolution 20:387-394. (Pubitemid 40817318)
8. BOND, W. J., AND G. F. MIDGLEY. 2000. A proposed CO2-controlled mechanism of woody plant invasion in grasslands and savannas. Global Change Biology 6:865-869. (Pubitemid 32978591)
9. BRANSON, F. A., G. G. GIFFORD, K. G. RENARD, AND R. F. HADLEY. 1981. Rangeland hydrology. Dubuque, IA, USA: Kendall/Hunt Publishing Company. 84 p.
10. BREMER, D. J., J. M. HAM, C. E. OWENSBY, AND A. K. KNAPP. 1998. Responses of soil respiration to clipping and grazing in a tallgrass prairie. Journal of Environmental Quality 27:1539-1548. (Pubitemid 28531489)
11. BRONSON, K. F., T. M. ZOBECK, T. T. CHUA, V. ACOSTA-MARTINEZ, R. S. VAN PELT, AND J. D. BOOKER. 2004. Carbon and nitrogen pools of southern high plains cropland and grassland soils. Soil Science Society of America Journal 68:1695-1704. (Pubitemid 39218934)
12. BROWN, S., A. DUSHKU, T. PEARSON, D. SHOCH, J. WINSTEN, S. SWEET, AND J. KADYSZEWSKI. 2004. Carbon supply from changes in management of forest, range, and agricultural lands of California. Sacramento, CA, USA: Winrock International, for the California Energy Commission, PIER Energy-Related Environmental Research. 500-04-068F. 144 p.
13. BURKE, I. C., C. M. YONKER, W. J. PARTON, C. V. COLE, K. FLACH, AND D. S. SCHIMEL. 1989. Texture, climate, and cultivation effects on organic matter content in US grassland soils. Soil Science Society of America Journal 53:800-805. (Pubitemid 20397872)
14. CAMPING, T. J., R. A. DAHLGREN, K. W. TATE, AND W. R. HORWATH. 2002. Changes in soil quality due to grazing and oak tree removal in California blue oak woodlands. In: R. B. Standiford, D. McCreary, and K. L. Purcell (EDS.). Oaks in California's changing landscape. Berkeley, CA, USA: US Department of Agriculture, General Technical Report PSW-184. p. 75-85.
15. CAO, G. M., Y. H. TANG, W. H. MO, Y. A. WANG, Y. N. LI, AND X. Q. ZHAO. 2004. Grazing intensity alters soil respiration in an alpine meadow on the Tibetan plateau. Soil Biology & Biochemistry 36:237-243.
16. CARBONE, M. S., G. C. WINSTON, AND S. E. TRUMBORE. 2008. Soil respiration in perennial grass and shrub ecosystems: linking environmental controls with plant and microbial sources on seasonal and diel timescales. Journal of Geophysical Research 113:G02022.
17. CHABBI, A., I. KOGEL-KNABNER, AND C. RUMPEL. 2009. Stabilised carbon in subsoil horizons is located in spatially distinct parts of the soil profile. Soil Biology & Biochemistry 41:256-261.
18. CHOU, W. W., W. L. SILVER, R. D. JACKSON, A. W. THOMPSON, AND B. ALLEN-DIAZ. 2008. The sensitivity of annual grassland carbon cycling to the quantity and timing of rainfall. Global Change Biology 14:1382-1394. (Pubitemid 351659558)
19. CHRISTIAN, J. M., AND S. D. WILSON. 1999. Long-term ecosystem impacts of an introduced grass in the northern Great Plains. Ecology 80:2397-2407. (Pubitemid 29485609)
20. CONANT, R. T., K. PAUSTIAN, AND E. T. ELLIOTT. 2001. Grassland management and conversion into grassland: effects on soil carbon. Ecological Applications 11:343-355. (Pubitemid 32276727)
21. DAHLGREN, R. A., M. J. SINGER, AND X. HUANG. 1997. Oak tree and grazing impacts on soil properties and nutrients in a California oak woodland. Biogeochemistry 39:45-64. (Pubitemid 27378294)
22. DEL GRASSO, S. J., D. S. OJIMA, W. J. PARTON, E. STEHFEST, M. HEISTEMANN, B. DEANGELO, AND S. ROSE. 2009. Global scale DAYCENT model analysis of greenhouse gas emissions and mitigation strategies for cropped soils. Global and Planetary Change 67:44-50.
23. DERNER, J. D., AND G. E. SCHUMAN. 2007. Carbon sequestration and rangelands: a synthesis of land management and precipitation effects. Journal of Soil and Water Conservation 62:77-85. (Pubitemid 350067742)
24. ESHEL, G., P. FINE, AND M. J. SINGER. 2007. Total soil carbon and water quality: an implication for carbon sequestration. Soil Science Society of America Journal 71:397-405. (Pubitemid 46449494)
25. EVINER, V. T., AND C. V. HAWKES. 2008. Embracing variability in the application of plant-soil interactions to the restoration of communities and ecosystems. Restoration Ecology 16:713-729.
26. 2 in soil profiles of a California annual grassland. Ecosystems 8:412-429. (Pubitemid 41176145)
27. FOLLETT, R. F., J. M. KIMBLE, AND R. LAL. 2001. The potential of U.S. grazing lands to sequester carbon and mitigate the greenhouse effect. Boca Raton, FL, USA: Lewis Publishers. 410 p.
28. FRANK, D. A., AND S. J. MCNAUGHTON. 1993. Evidence for the promotion of aboveground grassland production by native large herbivores in Yellowstone National Park. Oecologia 96:157-161. (Pubitemid 24413728)
29. GAMAN, T., AND J. FIRMAN. 2006. Oaks 2040: The status and future of oaks in California. Oakland, CA, USA: California Oak Foundation. 55 p.
30. GEORGE, M., J. BARTOLOME, N. MCDOUGALD, M. CONNOR, C. VAUGHN, AND G. MARKEGARD. 2001. Annual range forage production. Oakland, CA, USA: Division of Agriculture and Natural Resources, University of California. ANR Publ. 8018. 9 p.
31. GEORGE, M., J. CLAWSON, J. MENKE, AND J. BARTOLOME. 1985. Annual grassland forage productivity. Rangelands 7:17-19.
32. GESSLER, P. E., O. A. CHADWICK, F. CHAMRAN, L. ALTHOUSE, AND K. HOLMES. 2000. Modeling soil-landscape and ecosystem properties using terrain attributes. Soil Science Society of America Journal 64:2046-2056. (Pubitemid 32122321)
33. GIUSTI, G. A., R. B. STANDIFORD, D. D. MCCREARY, A. MERENLENDER, AND T. SCOTT. 2004. Oak woodland conservation in California's changing landscape. Berkeley, CA, USA: University of California. White paper, IHRMP publication. 6 p.
34. GORDON, D. R., AND K. J. RICE. 1992. Partitioning of space and water between two California annual grassland species. American Journal of Botany 79:967-976. (Pubitemid 24409661)
35. GRIFFIN, J. 1977. Oak woodland. In: M. J. Barbour and J. Major (EDS.). Terrestrial vegetation of California. New York, NY, USA: John Wiley and Sons. p. 383-415.
36. GUO, Y. Y., R. AMUNDSON, P. GONG, AND Q. YU. 2006. Quantity and spatial variability of soil carbon in the conterminous United States. Soil Science Society of America Journal 70:590-600.
37. HAVSTAD, K. M., D. C. PETERS, B. ALLEN-DIAZ, J. BARTOLOME, B. T. BESTELMEYER, D. BRISKE, J. BROWN, M. BRUNSON, J. E. HERRICK, L. HUNTSINGER, P. JOHNSON, L. JOYCE, R. PIEPER, A. J. SVEJCAR, AND J. YAO. 2009. The western United States rangelands, a major resource. In: W. F. Wedin and S. L. Fales (EDS.). Grassland quietness and strength for a new American agriculture. Madison, WI, USA: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America. p. 75-93.
38. HEADY, H., J. BARTOLOME, M. PITT, G. SAVELLE, AND M. STROUD. 1991. California prairie. In: R. T. Coupland (ED.). Natural grasslands. Ecosystems of the world. Volume 8A. Amsterdam, the Netherlands: Elsevier Scientific. p. 313-335. (Pubitemid 24410740)
39. HEADY, H. F. 1956. Changes in a California annual plant community induced by manipulation of natural mulch. Ecology 37:798-812.
40. HEADY, H. F. 1965. The influence of mulch on herbage production in an annual grassland. Proceedings of the 9th International Grassland Congress 1:391-394.
41. HEDRICK, D. W. 1948. The mulch layer of California annual ranges. Journal of Rangeland Management 1:22-25.
42. HERMAN, D. J., L. J. HALVERSON, AND M. K. FIRESTONE. 2003. Nitrogen dynamics in an annual grassland: oak canopy, climate, and microbial population effects. Ecological Applications 13:593-604. (Pubitemid 38012507)
43. HOBBS, R. J., S. ARICO, J. ARONSON, J. S. BARON, P. BRIDGEWATER, V. A. CRAMER, P. R. EPSTEIN, J. J. EWEL, C. A. KLINK, A. E. LUGO, D. NORTON, D. OJIMA, D. M. RICHARDSON, E. W. SANDERSON, F. VALLADARES, M. VILA, R. ZAMORA, AND M. ZOBEL. 2006. Novel ecosystems: theoretical and management aspects of the new ecological world order. Global Ecology and Biogeography 15:1-7. (Pubitemid 43379284)
44. HOBBS, R. J., AND H. A. MOONEY. 1986. Community changes following shrub invasion of grassland. Oecologia 70:508-513.
45. HOLLAND, E. A., W. J. PARTON, J. K. DETLING, AND D. L. COPPOCK. 1992. Physiological responses of plant populations to herbivory and their consequences for ecosystem nutrient flow. American Naturalist 140:685-706. (Pubitemid 23396493)
46. HOLLAND, V. L., AND D. J. KIEL. 1995. California vegetation. Dubuque, IA, USA: Kendall/Hunt Publishing Company. 516 p.
47. HUNTSINGER, L., J. W. BARTOLOME, AND C. M. D'ANTONIO. 2007. Grazing management of California grasslands. In: J. Corbin, M. Stromberg, and C. M. D'Antonio (EDS.). Berkeley, CA, USA: University of California Press. p. 233-297.
48. [IPCC] INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE. 2007. Climate change 2007: synthesis report. Contribution of Working Groups I, II and III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Core Writing Team, R. K. Pachauri and A. Reisinger [EDS.]. Geneva, Switzerland: IPCC. 104 p.
49. JACKSON, L. E., R. B. STRAUSS, M. K. FIRESTONE, AND J. W. BARTOLOME. 1988. Plant and soil nitrogen dynamics in California annual grassland. Plant and Soil 110:9-17.
50. JACKSON, R. B., J. CANADELL, J. R. EHLERINGER, H. A. MOONEY, O. E. SALA, AND E. D. SCHULZE. 1996. A global analysis of root distributions for terrestrial biomes. Oecologia 108:389-411.
51. JACKSON, R. B., E. G. JOBBAGY, R. AVISSAR, S. B. ROY, D. J. BARRETT, C. W. COOK, K. A. FARLEY, D. C. LE MAITRE, B. A. MCCARL, AND B. C. MURRAY. 2005. Trading water for carbon with biological sequestration. Science 310:1944-1947.
52. JACKSON, R. B., H. J. SCHENK, E. G. JOBBAGY, J. CANADELL, G. D. COLELLO, R. E. DICKINSON, C. B. FIELD, P. FRIEDLINGSTEIN, M. HEIMANN, K. HIBBARD, D. W. KICKLIGHTER, A. KLEIDON, R. P. NEILSON, W. J. PARTON, O. E. SALA, AND M. T. SYKES. 2000. Belowground consequences of vegetation change and their treatment in models. Ecological Applications 10:470-483.
53. JACKSON, R. D., AND J. W. BARTOLOME. 2002. A state-transition approach to understanding nonequilibrium plant community dynamics in Californian grasslands. Plant Ecology 162:49-65. (Pubitemid 35255220)
54. JACKSON, R. D., AND J. W. BARTOLOME. 2007. Grazing ecology of California grasslands. In: J. Corbin, M. Stromberg, and C. M. D'Antonio (EDS.). Ecology and management of California grasslands. Berkeley, CA, USA: University of California Press. p. 197-206.
55. JOBBAGY, E. G., AND R. B. JACKSON. 2000. The vertical distribution of soil organic carbon and its relation to climate and vegetation. Ecological Applications 10:423-436.
56. JOBBAGY, E. G., AND R. B. JACKSON. 2004. The uplift of soil nutrients by plants: biogeochemical consequences across scales. Ecology 85:2380-2389. (Pubitemid 39348531)
57. JOHNSON, L. C., AND J. R. MATCHETT. 2001. Fire and grazing regulate belowground processes in tallgrass prairie. Ecology 82:3377-3389. (Pubitemid 34018308)
58. KIEFT, T. L. 1994. Grazing and plant-canopy effects on semiarid soil microbial biomass and respiration. Biology and Fertility of Soils 18:155-162. (Pubitemid 2115233)
59. KOCHY, M., AND S. D. WILSON. 2001. Nitrogen deposition and forest expansion in the northern Great Plains. Journal of Ecology 89:807-817. (Pubitemid 32972507)
60. KROODSMA, D. A., AND C. B. FIELD. 2006. Carbon sequestration in Califronia agriculture, 1980-2000. Ecological Applications 16:1975-1985. (Pubitemid 44536942)
61. LAL, R. 2004. Agricultural activities and the global carbon cycle. Nutrient Cycling in Agroecosystems 70:103-116. (Pubitemid 40938298)
62. LAL, R., J. KIMBLE, E. LEVINE, and B. A. STEWART (EDS.). 1995.Soil management and greenhouse effect. Boca Raton, FL, USA: Lewis Publishers. 385 p.
63. LEHMANN, J. 2007. Bio-energy in the black. Frontiers in Ecology and the Environment 5:381-387.
64. LOESER, M. R., T. E. CREWS, AND T. D. SISK. 2004. Defoliation increased above-ground productivity in a semi-arid grassland. Journal of Range Management 57:442-447. (Pubitemid 40441198)
65. MA, F. S., S. Z. KANG, F. S. LI, J. H. ZHANG, T. S. DU, X. T. HU, AND M. X. WANG. 2007a. Effect of water deficit in different growth stages on stem sap flux of greenhouse grown pear-jujube tree. Agricultural Water Management 90:190-196.
66. MASIELLO, C. A., O. A. CHADWICK, J. SOUTHON, M. S. TORN, AND J. W. HARDEN. 2004. Weathering controls on mechanisms of carbon storage in grassland soils. Global Biogeochemical Cycles. 18:GB4023, doi: 10.1029/2004GB002219. (Pubitemid 40440584)
67. MARIANI, L., J. J. JIMENEZ, J. N. ASAKAWA, R. J. THOMAS, AND T. DECAENS. 2007. What happens to earthworm casts in the soil? A field study of carbon and nitrogen dynamics in neotropical savannahs. Soil Biology and Biochemistry 39:757-767. (Pubitemid 44909230)
68. MCBRIDE, J., AND H. F. HEADY. 1968. Invasion of grassland by Baccharis pilularis. Journal of Range Management 21:106-108.
69. MCCULLEY, R. L., E. G. JOBBAGY, W. T. POCKMAN, AND R. B. JACKSON. 2004. Nutrient uptake as a contributing explanation for deep rooting in arid and semi-arid ecosystems. Oecologia 141:620-628. (Pubitemid 40033029)
70. MCNAUGHTON, S. J. 1985. Ecology of a grazing ecosystem- the Serengeti. Ecological Monographs 55:259-294.
71. MILLER, R. M., AND J. D. JASTROW. 1990. Hierarchy of root and mycorrhizal fungal interactions with soil aggregation. Soil Biology & Biochemistry 22:579-584.
72. PARTON, W. J., D. S. OJIMA, AND D. S. SCHIMEL. 1994. Environmental change in grasslands- assessment using models. Climatic Change 28:111-141.
73. PAUSTIAN, K., E. LEVINE, W. M. POST, AND I. M. RYZHOVA. 1997. The use of models to integrate information and understanding of soil C at the regional scale. Geoderma 79:227-260. (Pubitemid 27468338)
74. POLLEY, H. W., H. B. JOHNSON, AND C. R. TISCHLER. 2003. Woody invasion of grasslands: evidence that CO2 enrichment indirectly promotes establishment of Prosopis glandulosa. Plant Ecology 164:85-94. (Pubitemid 36251405)
75. POST, W. M., AND K. C. KWON. 2000. Soil carbon sequestration and land-use change: processes and potential. Global Change Biology 6:317-327. (Pubitemid 30233822)
76. POTTER, K. N., AND J. D. DERNER. 2006. Soil carbon pools in central Texas: prairies, restored grasslands, and croplands. Journal of Soil and Water Conservation 61:124-128.
77. PUGET, P., AND L. E. DRINKWATER. 2001. Short-term dynamics of root-and shoot-derived carbon from a leguminous green manure. Soil Science Society of America Journal 65:771-779. (Pubitemid 32550453)
78. SANDERMAN, J., AND R. AMUNDSON. 2008. A comparative study of dissolved organic carbon transport and stabilization in California forest and grassland soils. Biogeochemistry 89:309-327.
79. SANDERMAN, J., J. A. BALDOCK, AND R. AMUNDSON. 2008. Dissolved organic carbon chemistry and dynamics in contrasting forest and grassland soils. Biogeochemistry 89:181-198.
80. SAVELLE, G. D. 1977. Comparative structure and function in a California annual and native bunchgrass community [dissertation]. Berkeley, CA, USA: University of California.
81. SCHIMEL, D. S., B. H. BRASWELL, E. A. HOLLAND, R. MCKEOWN, D. S. OJIMA, T. H. PAINTER, W. J.PARTON, ANDA. R.TOWNSEND. 1994. Climatic, edaphic, and biotic controls over storage and turnoverof carbon insoils. Global Biogeochemical Cycles 8:279-293.
82. SCHLESINGER, W. H., J. F. REYNOLDS, G. L. CUNNINGHAM, L. F. HUENNEKE, W. M. JARRELL, R. A. VIRGINIA, AND W. G. WHITFORD. 1990. Biological feedbacks in global desertification. Science 247:1043-1048.
83. SCHROTER, D., W. CRAMER, R. LEEMANS, I. C. PRENTICE, M. B. ARAÚJO, N. W. ARNELL, A. BONDEAU, H. BUGMANN, T. R. CARTER, C. A. GRACIAH, A. DE LA VEGA-LEINERT, M. ERHARD, F. EWERT, M. GLENDINING, J. I. HOUSE, S. KANKAANPAA, R. J. T. KLEIN, S. LAVOREL, M. LINDNER, M. J. METZGER, J. MEYER, T. D. MITCHELL, I. REGINSTER, M. ROUNSEVELL, S. SABATE, S. SITCH, B. SMITH, J. SMITH, P. SMITH, M. T. SYKES, K. THONICKE, W. THUILLER, G. TUCK, S. ZAEHLE, AND B. ZIERL. 2005. Ecosystem service supply and vulnerability to global change in Europe. Science 310:1333-1337. (Pubitemid 41698866)
84. SCHUMAN, G. E., H. H. JANZEN, AND J. E. HERRICK. 2002. Soil carbon dynamics and potential carbon sequestration by rangelands. Environmental Pollution 116:391-396. (Pubitemid 33095085)
85. SHUSTER, W. D., S. SUBLER, AND E. L. MCCOY. 2001. Deep-burrowing earthworm additions changed the distribution of soil organic carbon in a chisel-tilled soil. Soil Biology and Biochemistry 33:983-996. (Pubitemid 32533119)
86. SILVER, W. L., A. E. LUGO, AND D. FARMER. 2002. Soil organic carbon in tropical forests of the U. S. In: J. Kimble, R. Birdsey, L. Heath, R. Follett, and R. Ratan (EDS.). The potential of U.S. forest soils to sequester carbon and mitigate the greenhouse effect. Boca Raton, FL, USA: Lewis Publishers. p. 363-382.
87. SILVER, W. L., A. E. LUGO, AND M. KELLER. 1999. Soil oxygen availability and biogeochemistry along rainfall and topographic gradients in upland wet tropical forest soils. Biogeochemistry 44:301-328. (Pubitemid 29079724)
88. SILVER, W. L., R. OSTERTAG, AND A. E. LUGO. 2000. The potential for carbon sequestration through reforestation of abandoned tropical agricultural and pasture lands. Restoration Ecology 8:394-407. (Pubitemid 32140084)
89. SIX, J. A., E. T. ELLIOTT, AND K. PAUSTIAN. 2000. Soil macro aggregate turnover and micro aggregate formation: a mechanism for C sequestration under no-tillage agriculture. Soil Biology and Biochemistry 32:2099-2103. (Pubitemid 32035603)
90. SMITH, P. 2004. Soils as carbon sinks: the global context. Soil Use and Management 20:212-218. (Pubitemid 38991382)
91. SMITH, P., C. M. FANG, J. J. C. DAWSON, AND J. B. MONCRIEFF. 2008. Impact of global warming on soil organic carbon. Advances in Agronomy 97:1-43.
92. SOUSSANA, J. F., P. LOISEAU, N. VUICHARD, E. CESCHIA, J. BALESDENT, T. CHEVALLIER, AND D. ARROUAYS. 2004. Carbon cycling and sequestration opportunities in temperate grasslands. Soil Use and Management 20:219-230. (Pubitemid 38991383)
93. STEENWERTH, K. L., L. E. JACKSON, F. J. CALDERON, M. R. STROMBERG, AND K. M. SCOW. 2002. Soil microbial community composition and land use history in cultivated and grassland ecosystems of coastal California. Soil Biology and Biogeochemistry 34:1599-1611. (Pubitemid 35450745)
94. STROMBERG, M. R., P. KEPHART, AND V. YADON. 2001. Composition, invasibility, and diversity in coastal California grasslands. Madrono 48:236-252.
95. TRUMBORE, S. E., O. A. CHADWICK, AND R. AMUNDSON. 1996. Rapid exchange between soil carbon and atmospheric carbon dioxide driven by temperature change. Science 272:393-396.
96. TURNER, C. L., T. R. SEASTEDT, AND M. I. DYER. 1993. Maximization of aboveground grassland production- the role of defoliation frequency, intensity, and history. Ecological Applications 3:175-186. (Pubitemid 23402077)
97. VAN AUKEN, O. W. 2000. Shrub invasions of North American semiarid grasslands. Annual Review of Ecology and Systematics 31:197-215. (Pubitemid 32122400)
98. WALDROP, M. P., AND M. K. FIRESTONE. 2006. Seasonal dynamics of microbial community composition and function in oak canopy and open grassland soils. Microbial Ecology 52:470-479. (Pubitemid 44899540)
99. ZAVALETA, E. S., AND L. S. KETTLEY. 2006. Ecosystem change along a woody invasion chronosequence in a California grassland. Journal of Arid Environments 66:290-306.