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Publication Title: Nitrogen in ectomycorrhizal mat and non-mat soils of different-age Douglas-fir forests
Year: 1993 Publication Type: Journal Article
H. J. Andrews Publication Number: 1527
Citation: Aguilera, Lisa M.; Griffiths, Robert P.; Caldwell, Bruce A. 1993. Nitrogen in ectomycorrhizal mat and non-mat soils of different-age Douglas-fir forests. Soil Biology and Biochemistry. 25(8): 1015-1019.
Online PDF: http://andrewsforest.oregonstate.edu/pubs/pdf/pub1527.pdf
Abstract: In an attempt to determine how stand age and mat-forming fungi affect N chemistry in forestsoils, soils with or without ectomycorrhizal mats were collected from five Douglas-fir [Pseudotsugamenziesii (Mirb.) Franco] forest stands, age 2-450 yr, in the Oregon Cascade Mountains. A number ofchemical and biological variables were measured in these soils, including: soil organic matter (SOM), pH,total N, inorganic N, extractable NH4 and NO3, fungal hyphal length, numbers of bacteria, and labileC and N. Total soil N and labile N both were significantly greater in old-growth soils than in other soils,suggesting that forest soils become enriched in organic N with age. Labile C concentrations were higherin mat than in non-mat soils of all age classes but were significantly higher only in the older stands. Thisfinding suggests that ectomycorrhizal mat communities affect soil N with age both by selectively removingorganic N and by producing compounds with high C:N ratios.
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