期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 57, 期 -, 页码 282-291出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2012.10.004
关键词
Carbon; Decomposition; Ectomycorrhizal; Extracellular enzyme; Fungi; Nitrogen; Saprotroph; Soil
类别
资金
- University of Minnesota Department of Plant Pathology
- NOAA Climate and Global Change Postdoctoral Research Fellowship
- NSF [DBI 1249341, DBI 1046052]
- Department of Soil Science
- Direct For Biological Sciences [1046115] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Division Of Environmental Biology [1046052, 1249341] Funding Source: National Science Foundation
- Division Of Environmental Biology [1046115] Funding Source: National Science Foundation
The relative roles of ectomycorrbizal (ECM) and saprotrophic communities in controlling the decomposition of soil organic matter remain unclear. We tested the hypothesis that ECM community structure and activity influences the breakdown of nutrient-rich biopolymers in soils, while saprotrophic communities primarily regulate the breakdown of carbon-rich biopolymers. To test this hypothesis, we used high-throughput techniques to measure ECM and saprotrophic community structure, soil resource availability, and extracellular enzyme activity in whole soils and on ECM root tips in a coastal pine forest. We found that ECM and saprotroph richness did not show spatial structure and did not co-vary with any soil resource. However, species richness of ECM fungi explained variation in the activity of enzymes targeting recalcitrant N sources (protease and peroxidase) in bulk soil. Activity of carbohydrate- and organic P- targeting enzymes (e.g. cellobiohydrolase, beta-glucosidase, alpha-glucosidase, hemicellulases, N-acetyl-glucosaminidase, and acid phosphatase) was correlated with saprotroph community structure and soil resource abundance (total soil C, N, and moisture), both of which varied along the soil profile. These observations suggest independent roles of ECM fungi and saprotrophic fungi in the cycling of N-rich, C-rich, and P-rich molecules through soil organic matter. Enzymatic activity on ECM root tips taken from the same soil cores used for bulk enzyme analysis did not correlate with the activity of any enzyme measured in the bulk soil, suggesting that ECM contributions to larger-scale soil C and nutrient cycling may occur primarily via extramatrical hyphae outside the rbizosphere. Published by Elsevier Ltd.
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