Effect of N deposition on decomposition of plant litter and soil organic matter in forest systems

Environmental Reviews

Volumn 5, Issue 1, 1997, Pages 1-25

  Berg, Björn ^a,b   Matzner, Egbert ^a  

^a UNIVERSITY OF BAYREUTH   (Germany)

^b SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES   (Sweden)

Author keywords

C mineralization; Deposition; Humus; Litter; Mycorrhiza; Nitrogen

Indexed keywords

EID: 0003114873     PISSN: 11818700     EISSN: None     Source Type: Journal    
DOI: 10.1139/a96-017     Document Type: Article

References (123)

1. Aber, J.A., Melillo, J.M., Nadelhofer, K.J., Pastor, J., and Boone, R. 1991. Factors controlling nitrogen cycling and nitrogen saturation in northern temperate forest ecosystems. Ecol. Appl. 1: 303-315.
2. Adams, S.N., and Cornforth, I.S. 1973. Some short-term effects of lime and fertilizers on a Sitka spruce plantation. II. Laboratory studies on litter decomposition and nitrogen mineralization. Forestry, 46: 39-47.
3. Alexander, M. 1977. Introduction to soil microbiology. 2nd ed. Wiley, London, pp. 1-467.
4. Allison, F.E. 1966. The fate of nitrogen applied to soils. Adv. Agron. 18: 219-258.
5. Anonymous. 1996. Swedish national survey of forest soils and vegetation. Department of Forest Soils, Swedish University of Agricultural Sciences, Uppsala, Sweden.
6. Archibald, F., and Roy, B. 1992. Production of manganic chelates by laccase from the lignin-degrading fungus Trametes (Coriolus) versicolor. Appl. Environ. Microbiol. 58: 1496-1499.
7. Arnebrant, K., and Söderström, B. 1992. Effects of different fertilizer treatments on ectomycorrhizal colonization potential in two Scots pine forests in Sweden. For. Ecol. Manage. 53: 77-89.
8. Attiwill, P.M., and Maheswaran, J. 1989. Soil respiration in Eucalypt forests of southeastern Australia. Biol. Fertil. Soils, 8(2): 154-159.
9. 15N) to Scots pine needle litter in different stages of decomposition. Scand. J. For. Res. 3: 273-280.
10. Bååth, E., Lundgren, B., and Söderström, B. 1981. Effects of nitrogen fertilization on the activity and biomass of fungi and bacteria in a podzolic soil. Zentralbl. Bakteriol. Mikrobiol. Hyg. Abt. 1 Orig. C, 2: 90-98.
11. Bal, L. 1973. Micromorphological analysis of soils. Soil Survey Papers of the Netherlands Soil Survey Institute No. 6, Wageningen, the Netherlands.
12. Barder, M.J., and Crawford, D.L. 1981. Effects of carbon and nitrogen supplementation on lignin and cellulose decomposition by a Streptomyces. Can. J. Microbiol. 27: 859-863.
13. Beckjord, P.R., Melhuish, J.M., and McIntosh, M. 1985. Effects of nitrogen and phosphorus fertilization on growth and formation of Quercus alba and Q. rubra seedlings by Pisolitus tinctorius and Scleroderma auranteum. Can. J. Bot. 63: 1677-1680.
14. Berg, B. 1986. Nutrient release from litter and humus in coniferous forest soils - a minireview. Scand. J. For. Res. 1: 359-370.
15. 15N) in decomposing Scots pine (Pinus silvestris L.) needle litter. Long-term decomposition in a Scots pine forest. VI. Can. J. Bot. 66: 1539-1546.
16. Berg, B., and Cortina, J. 1995. Nutrient dynamics in some leaf and needle litter types of different chemical composition in a Scots pine forest. Scand. J. For. Res. 10: 1-11.
17. Berg, B., and Ekbohm, G. 1983. Nitrogen immobilization to decomposing needle litter at variable carbon-nitrogen ratios. Ecology, 64: 63-67.
18. Berg, B., and Ekbohm, G. 1991. Litter mass-loss rates and decomposition patterns in some needle and leaf litter types. Long-term decomposition in a Scots pine forest. VII. Can. J. Bot. 69: 1449-1456.
19. Berg, B., and Ekbohm, G. 1993. Decomposing needle litter in Lodgepole pine (Pinus contorta) and Scots pine (Pinus sylvestris) monocultural systems. Is there a maximum mass loss? Scand. J. For. Res. 8: 457-465.
20. Berg, B., and Lundmark, J.E. 1987. Decomposition of needle litter in lodgepole pine and Scots pine monocultures - a comparison. Scand. J. For. Res. 2: 3-12.
21. Berg, B., and McClaugherty, C. 1987. Nitrogen release in forest litter in relation to lignin decomposition. Biogeochemistry, 4: 219-225.
22. Berg, B., and McClaugherty, C. 1989. Nitrogen and phosphorus release from decomposing litter in relation to the disappearance of lignin. Can. J. Bot. 67: 1148-1156.
23. Berg, B., and Staaf, H. 1980. Decomposition rate and chemical changes in decomposing needle litter of Scots pine. II. Influence of chemical composition. Ecol. Bull. 32: 373-390.
24. Berg, B., and Staaf, H. 1981. Leaching, accumulation and release of nitrogen in decomposing forest litter. Ecol. Bull. 33:163-178.
25. Berg, B., and Tamm, C.O. 1991a. Decomposition and nutrient dynamics of litter in long-term optimum nutrition experiments. I. Organic matter decomposition in Norway spruce (Picea abies) needle litter. Scand. J. For. Res. 6: 305-321.
26. Berg, B., and Tamm, C.O. 1991b. Decomposition and nutrient dynamics of Norway spruce needle litter in a long-term optimum nutrition experiment. Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Uppsala, Sweden. Rep. No 39.
27. Berg, B., and Tamm, C.O. 1994. Decomposition and nutrient dynamics of litter in long-term optimum nutrition experiments. II. Nutrient concentration changes in decomposing Norway spruce (Picea abies) needle litter. Scand. J. For. Res. 9: 99-105.
28. Berg, B., and Theander, O. 1984. The dynamics of some nitrogen fractions in decomposing Scots pine needles Pedobiologia, 27: 161-167.
29. Berg, B., and Wessen, B. 1984. Changes in organic-chemical components and ingrowth of fungal mycelium in decomposing birch leaf litter as compared to pine needles. Pedobiologia, 26: 285-298.
30. Berg, B., Hannus, K., Popoff, T., and Theander, O. 1982. Changes in organic-chemical components of needle litter during decomposition. Long-term decomposition in a Scots pine forest. I. Can. J. Bot. 60: 1310-1319.
31. Berg, B., Ekbohm, G., and McClaugherty, C.A. 1984. Lignin and holocellulose relations during long-term decomposition of some forest litters. Long-term decomposition in a Scots pine forest. IV. Can. J. Bot. 62: 2540-2550.
32. Berg, B., Staaf, H., and Wessen, B. 1987. Decomposition of Scots pine needle litter of differing nutrients concentrations. Scand. J. For. Res. 2: 399-415.
33. Berg, B., Tamm, C.O., and Aronsson, A. 1991. The influence of stand density and litter quality on litter decomposition rates in manipulated Scots pine forests. The effect of fertilization and irrigation. Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Uppsala, Sweden. Rep. No. 43.
34. Berg, B., McClaugherty, C., and Johansson, M. 1993. Litter mass-loss rates in late stages of decomposition at some climatically and nutritionally different pine sites. Long-term decomposition in a Scots pine forest. VIII. Can. J. Bot. 71: 680-692.
35. Berg, B., McClaugherty, C., Virzo De Santo, A., Johansson, M.-B., and Ekbohm, G. 1995. Decomposition of forest litter and soil organic matter - a mechanism for soil organic matter buildup? Scand. J. For. Res. 10: 108-119.
36. Berg, B., Ekbohm, G., Johansson, M.-B., McClaugherty, C., Rutigliano, F., and Virzo De Santo, A. 1996. Some foliar litter types have a maximum limit for decomposition - a synthesis of data from forest systems. Can. J. Bot. 74: 659-672.
37. Berg, B., McClaugherty, C., and Johansson, M.-B. 1997. Chemical changes in decomposing litter can be systemized with respect to the litter's initial chemical composition. Reports from the Departments in Forest Ecology and Forest Soils, Swedish University of Agricultural Sciences, Uppsala, Sweden. Rep. 74:1-85.
38. Bergkvist, B., and Folkeson, L. 1992. Soil acidification and element fluxes of a Fagus sylvatica forest influenced by simulated nitrogen deposition. Water Air Soil Pollut. 65: 111-133.
39. Billet, M.F., Fitzpatrick, E.A., and Cresser, M.S. 1990. Changes in the storage of carbon and nitrogen status of forest soil organic horizons between 1949/50 and 1987. Environ. Pollut. 66: 67-79.
40. Blagodatskiy, S.A., Larionova, A.A., and Tevdokimov, I.Y. 1993. Effect of mineral nitrogen on the respiration rate and growth efficiency of soil microorganisms. Eurasian Soil Sci. 25: 85-95.
41. Bobbink, R., Boxman, D., Fremstad, E., Heil, G., Houdijk, A., and Roelofs, J. 1992. Critical loads for nitrogen eutrophication of terrestrial and wetland ecosystems based upon changes in vegetation and fauna (alpine heathlands, deposition). In Critical loads for nitrogen - a workshop report. Edited by P.E. Grennfelt and E. Thörnelöf. Nordic Council of Ministers, Copenhagen. Nord Rep. 1992:41.
42. Bockheim, J.G., Leide, J.E., and Freilich, L.E. 1989. Red pine growth and chemical composition of foliage and forest floors across a precipitation gradient in Wisconsin. Can. J. For. Res. 19: 1543-1549.
43. Bollag, J.-M., Minard, R.D., and Liu, S.-Y. 1983. Cross-linkage between anilines and phenolic constituents. Environ. Sci. Technol. 17: 72-80.
44. Bosatta, E., and Staaf, H. 1982. The control of nitrogen turn-over in forest litter. Oikos, 39: 143-151.
45. Brandrud, T.E. 1995. The effects of experimental nitrogen addition on the ectomycorrhizal fungus flora in an oligotrophic spruce forest at Gårdsjön, Sweden. For. Ecol. Manage. 71: 111-122.
46. Bringmark, E., and Bringmark, L. 1991. Large-scale pattern of mor layer degradation in Sweden measured as standardized respiration. In Humic substances in the aquatic and terrestrial environment. Proceedings of an International Symposium, Linköping, Sweden, 21-23 August 1989. Lecture Notes in Earth Sciences No. 33. Springer-Verlag, Berlin.
47. Dirkse, G.M., and Van Dobben, H.F. 1989. Het effect van bemesting op de samenstelling van de kruidlaag van dennenbossen. Natura, 9: 208-212. [In Dutch.]
48. Dirkse, G.M., Van Dobben, H.F., and Tamm, C.O. 1991. Effects of fertilization on herb and moss layers of a Scots pine stand in Lisselbo (Sweden); a multivariate analysis. Research Institute for Nature Management, Leersum, the Netherlands. Rep. 91/7. pp. 1-40.
49. Dugger, W.M. 1983. Boron in plant metabolism. In Inorganic plant nutrition. Edited by A. Läuchli and R.L. Bielski. Springer-Verlag, Berlin, pp. 626-650.
50. Edmonds, R. 1980. Litter decomposition and nutrient release in Douglas fir, Red alder, western hemlock, and Pacific silver fir ecosystems in western Washington. Can. J. .For. Res. 10: 327-337.
51. Ekbohm, G., and Rydin, B. 1990. On estimating the species - area relationship. Oikos, 57: 145-146.
52. Eriksson, K.-E., Blanchette, R.A., and Ander, P. 1990. Microbial and enzymatic degradation of wood and wood components. Springer Series in Wood Science. Springer Verlag, Berlin.
53. Falkengren-Grerup, U. 1986. Soil acidification and vegetation changes in deciduous forest in southern Sweden. Oecologia, 70: 339-347.
54. Falkengren-Grerup, U., and Eriksson, H. 1990. Changes in soil, vegetation and forest yield between 1947 and 1988 in beech and oak sites southern Sweden. For. Ecol. Manage. 38: 37-53.
55. Fessenden, R. J., Calvert, R. F., and Armson, K.A. 1971. Effect of some fertilizers and simazine on the activity of the microorganisms in jack pine humus. For. Chron. 47: 227-228.
56. Findlay, W.P.K. 1934. Studies in the physiology of the wood-destroying fungi. I. The effect of nitrogen content upon the rate of decay of timber. Ann. Bot. 48: 109-117.
57. Flaig, W., Schobinger, U., and Deuel, H. 1959. Umwandlung von Lignin in Huminsäuren bei der Verrottung von Weizenstroh. Chem. Ber. 92(9): 1973-1982. [In German, English summary.]
58. Fog, K. 1988. The effect of added nitrogen on the rate of decomposition of organic matter. Biol. Rev. 63: 433-462.
59. Foster, N. W., Beauchamp, E.G., and Corke, C.T. 1980. Microbial activity in a Pinus banksiana Lamb. forest floor amended with nitrogen and carbon. Can. J. Soil Sci. 60: 199-209.
60. Gallardo, A., and Merino, J. 1992. Nitrogen immobilization in leaf litter at two Mediterranean ecosystems of SW Spain. Biogeochemistry, 15: 213-228.
61. Gallardo, A., and Schlesinger, W.H. 1994. Factors limiting microbial biomass in the mineral soil and forest floor of a warm-temperate forest. Soil Biol. Biochem. 26: 1409-1415.
62. Granhall, U., and Slapokas, T. 1984. Leaf litter decomposition in energy forestry. First-year nutrient release and weight loss in relation to the chemical composition of different litter types. In Ecology and management of forest biomass production systems. Edited by K. Perttu. Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Uppsala, Sweden. Rep. No. 15. pp. 131-153.
63. Green, C.J., Blackmer, A.M., and Horton, R. 1995. Nitrogen effects on conservation of carbon during corn residue decomposition in sou. Soil Sci. Soc. Am. J. 59: 453-459.
64. Griffiths, R., Caldwell, B.A., Cromack, K., Jr., and Morita, R.Y. 1990. Douglas-fir forest soils colonized by ectomycorrhizal mats. 1. Seasonal variation in nitrogen chemistry and nitrogen transformation rates. Can. J. For. Res. 20: 211-218.
65. Harmsen, G.W., and van Schreven, D.A. 1955. Mineralization of organic nitrogen in soil. Adv. Agron. 7: 299-398.
66. Herman, W.A., McGill, W.B., and Dormaar, J.F. 1977. Effects of initial chemical composition on decomposition of roots of three grass species. Can. J. Soil Sci. 57: 205-215.
67. Hintikka, V., and Näykki, O. 1967. Notes on the effects of the fungus Hydnellum ferrugineum on forest soil and vegetation. Commun. Inst. For. Fenniae, 62: 1-22.
68. Hohmann, J., and Neely, R.K. 1993. Decomposition of Sparangium eurycarpum under controlled pH and nitrogen regimes. Aquat. Bot. 46: 17-33.
69. Howard, P.J.A., and Howard, D.M. 1974. Microbial decomposition of tree and shrub leaf litter. 1. Weight loss and chemical composition of decomposing litter, Oikos, 25: 311-352.
70. Hungate, R.E. 1940. Nitrogen content of sound and decayed coniferous woods and its relation to loss in weight during decay. Bot. Gaz. 102: 382-392.
71. Jacquin, F., and Mangenot, F. 1959. Populations microbiennes des bois. III. Humification in vitro d'une sciure de hetre. Plant Soil, 9: 377-391.
72. Jenny, H. 1980. The soil resource. In Origin and behaviour. Springer Verlag, New York. pp. 1-248.
73. Johansson, M.-B. 1994. The influence of soil scarification on the turnover rate of slash needles and nutrient release. Scand. J. For. Res. 9: 170-179.
74. Johansson, M.-B., Berg, B., and Meentemeyer, V. 1995. Litter mass-loss rates in late stages of decomposition in a climatic transect of pine forests. Long-term decomposition in a Scots pine forest. IX. Can. J. Bot. 73: 1509-1521.
75. Keyser, P., Kirk, T.K., and Zeikus, I.G. 1978. Ligninolytic enzyme of Phanerochaete chrysosporium: synthesized in the absence of lignin in response to nitrogen starvation. J. Bacteriol. 135: 790-797.
76. Kondo, R., Iimori, T., Imamura, H., and Nishida, T. 1990. Polymerization of DHP and depolymerization of DHP-glucoside by lignin oxidizing enzymes. J. Biotechnol. 13: 181-188.
77. Kuyper, T.W. 1989. Auswirkungen der Waldduengung auf die Mykoflora. Mitteilung 398 der Biologischen Station Wijster, Wijster, the Netherlands, pp. 5-20. [In German, English summary.]
78. Kuyper, T.W., and de Vries, B.W. 1990. Effects of fertilization on the mycoflora of a pine forest. Wageningen Agric. Univ. Pap. 90-6: 102-112.
79. Lewis, D.H. 1980. Boron, lignification and the origin of vascular plants - a unified hypothesis. New Phytol. 84: 209-229.
80. Lindeberg, G. 1944. Ueber die Physiologie Ligninabbauender Bodenhymenomyzeten. Symb. Bot. Ups. 8(2): 1-183.
81. Liu, S.-Y., Freyer, A.J., Minard, R.D., and Bollag, J.-M. 1985. Enzyme-catalyzed complex-formation of amino esters and phenolic humus constituents. Soil Sci. Soc. Am. J. 49: 337-342.
82. Lobarzewski, J., Trojanowski, K., and Wojtas-Wasilewska, M. 1982. The effects of fungal peroxidases on Na-lignosulfonates. Holzforschung, 36: 173-176.
83. Lousier, J.D., and Parkinson, D. 1976. Litter decomposition in a cool deciduous forest. Can. J. Bot. 54: 419-436.
84. Maas, E.F., and Adamson, R.M. 1972. Resistance of sawdust, peats, and bark to decomposition in the presence of soil and nutrient solution. Soil Sci. Soc. Am. Proc. 36: 769-772.
85. Makarov, M.I., and Krasilnikova, T.L. 1987. Nitrogen and phosphorus content in plants under conditions of industrial pollution of the atmosphere and the soil. Moscow Univ. Soil Sci. Bull. 42: 2-11.
86. Manderscheid, B., and Matzner, E. 1995. Spatial heterogeneity of soil solution chemistry in a mature Norway spruce (Picea abies (L.) Karst) stand. Water Air Soil Pollut. 85: 1185-1190.
87. Mangenot, F., and Reymond, J. 1963. Populations microbiennes des bois. V. Influence de quelques sources de carbone et d'azote sur la décomposition d'une sciure. Rev. Gen. Bot. 70: 107-129. [In French.]
88. Matzner, E. 1989. Acidic precipitation: case study solling. In Advances in environmental sciences: acidic precipitation. Vol. 1. Edited by D.C. Adriano and M. Havas. Springer Verlag, Berlin.
89. McClaugherty, C., and Berg, B. 1987. Cellulose, lignin and nitrogen levels as rate regulating factors in forest litter decomposition. Pedobiologia, 30: 101-112.
90. Melillo, J.M., Aber, J.D., and Muratore, J. 1982. Nitrogen and lignin control of hardwood leaf litter decomposition dynamics. Ecology, 63: 621-626.
91. Miller, H. 1979. The nutrient budgets of even-aged forests. In The ecology of even-aged forest plantations. Proceedings of the Meeting of Division I, International Union of Forestry Research Organisations, September 1978, Edinburgh. Edited by E.D. Ford, D.C. Malcolm, and J. Atterson. Institute of Terrestrial Ecology, Cambridge, pp. 221-238.
92. Miller, H.G., and Miller, J.D. 1976. Analysis of needle fall as a means of assessing nitrogen status in pine. Forestry, 49: 57-61.
93. Mulder, E.G., Lie, T.A., and Woldendorp, J.W. 1969. Biology and soil fertility. In Soil biology, reviews of research. UNESCO, Paris, pp. 163-208.
94. Nohrstedt, H.-Ö., Arnebrant, K., Bååth, E., and Söderström, B. 1989. Changes in carbon content, respiration rate, ATP content and microbial biomass in nitrogen-fertilized pine forests soils in Sweden. Can. J. For. Res. 19: 323-328.
95. Nömmik, H., and Möller, G. 1981. Nitrogen recovery in soil and needle biomass after fertilization of a Scots pine stand, and growth responses obtained. Stud. For. Suec. 159: 1-37.
96. Nömmik, H., and Vahtras, K. 1982. Retention and fixation of ammonium and ammonia in soils. Agron. Monogr. 22: 123-171.
97. Ohtonen, R., and Markkola, A.M. 1991. Biological activity and amount of FDA mycelium in mor humus of Scots pine stands (Pinus sylvestris L.) in relations to soil properties and degree of pollution. Biogeochemistry, 13: 1-26.
98. Paul, E. 1984. Dynamics of organic matter in soils. Plant Soil, 76: 75-285.
99. Perez, J., and Jeffries, T.W. 1992. Roles of manganese and organic acid chelators in regulating lignin degradation and biosynthesis of peroxidases by Phanerochate chrysosporium. Appl. Environ. Microbiol. 58: 2402-2409.
100. Persson, T., and Wiren, A. 1989. Microbial activity in forest soils in relation to acid/base and carbon/nitrogen status. Meddelelser fra Norsk institutt for skogforskning, 42: 83-95.
101. Pregitzer, K.S., and Burton, A. 1992. Foliar sulfur and nitrogen along an 800-km pollution gradient. Can. J. For. Res. 22: 1761-1769.
102. Reid, I.D. 1983. Effects of nitrogen sources on cellulose and synthetic lignin degradation by Phanerochaete chrysosporium. Appl. Environ. Microbiol. 45: 838-842.
103. Roberge, M.R. 1976. Respiration rates for determining the effects of urea on the soil-surface organic horizon of a black spruce stand. Can. J. Microbiol. 22: 1328-1335.
104. Roberge, M.R., and Knowles, R. 1966. Ureolysis, immobilization and nitrification in black spruce humus. Soil Sci. Soc. Am. Proc. 30: 201-204.
105. Rosen, K., Gundersen, P., Tegnhammar, L., Johansson, M., and Frogner, T. 1992. Nitrogen enrichment of Nordic forest ecosystems - the concept of critical loads. Ambio, 21: 364-368.
106. Ruehling, C., and Tyler, G. 1991. Effects of simulated nitrogen deposition to the forest floor on the macro fungal flora of a beech forest. Ambio, 20: 261-263.
107. Saito, T. 1966. Sequential pattern of decomposition of beech litter with special reference to microbial succession. Ecol. Rev. 16: 245-254.
108. Salonius, P. O. 1972. Microbiological response to fertilizer treatments in organic forest soils. Soil Sci. 114: 12-19.
109. Smolander, A., Kurka, A., Kitunen, V., and Mälkönen, E. 1994. Microbial biomass C and N, and respiratory activity in soil of repeatedly limed and N- and P-fertilized Norway spruce stands. Soil Biol. Biochem. 26(8): 957-962.
110. Söderström, B., Bååth, E., and Lundgren, B. 1983. Decrease in soil microbial activity and biomasses owing to nitrogen amendments. Can. J. Microbiol. 29: 1500-1506.
111. Staaf, H. 1980. Influence of chemical composition, addition of raspberry leaves and nitrogen supply on decomposition rate and dynamics of nitrogen and phosphorus in beech leaf litter. Oikos, 35: 55-62.
112. Stevenson, F.J. 1982. Humus chemistry. Genesis, composition, reactions. John Wiley and Sons, New York.
113. Tamm, C.O. 1991. Nitrogen in terrestrial ecosystems. Questions of productivity, vegetational changes, and ecosystem stability. Ecological Studies 81. Springer Verlag, Berlin.
114. Tamm, C.O., Nilsson, A., and Wiklander, G. 1974. The optimum nutrition experiment Lisselbo. A brief description of an experiment in a young stand of Scots pine (Pinus silvestris L). Department of Forest Ecology and Forest Soils, Royal College of Forestry, Stockholm. Res. Notes No. 18.
115. Tamm, C.O., Aronsson, A., and Burgtorf, H. 1984. A brief description in a young stand of Norway spruce. Inst f Skogsekologi och Marklära, Swedish University of Agricultural Sciences, Uppsala, Sweden. Rep. No. 17. [In Swedish, English summary.]
116. Tamm, C.O., Aronsson, A., and Popovic, B. 1998. Nutrient optimization and nitrogen saturation experiments in pine forests (Pinus sylvestris). Stud. For. Suec. In press.
117. Taylor, B.R., Parkinson, D., and Parsons, W. 1989. Nitrogen and lignin content as predictors of litter decay rates: a microcosm test. Ecology, 70: 97-104.
118. Tremorshuizen, A.J. 1993. The influence of nitrogen fertilisers on ectomycorrhizas and their fungal scarpospores in young stands of Pinus sylvestris. For. Ecol. Manage. 57: 179-189.
119. Tyler, G. 1987. Probable effects of soil acidification and nitrogen deposition on the floristic composition of oak (Quercus robur L.) forest. Flora, 179: 165-170.
120. Tyler, G., Balsberg-Pahlsson, A.-M., Bergkvist, B., Falkengren-Grerup, U., Folkeson, L., Nihlgård, B., Ruehling, A., and Stjernquist, I. 1992. Chemical and biological effects of simulated nitrogen deposition to the ground in a Swedish beech forest. Scand. J. For. Res. 7: 515-532.
121. Unestam, T. 1991. Water repellency, mat formation, and leaf-stimulated growth of some ectomycorrhizal fungi. Mycorrhiza, 1: 13-20.
122. Waksman, S.A. 1924. Influence of microorganisms upon the carbon-nitrogen ratio in soil. J. Agric. Sci. 14: 555-562.
123. Wicklow, D.T., Detroy, R.W., and Adams, S. 1980. Differential modification of the lignin and cellulose components in wheat straw by fungal colonists of ruminant dung-ecological implications. Mycologia, 72: 1065-1076.