Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 41, Issue 4, Pages 858-861Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2009.01.018
Keywords
Glomalin-related soil protein (GRSP); Arbuscular mycorrhizal fungi; Pristine forest; delta N-15; delta C-13; Isotope enrichment; Chile
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Increasing evidence suggests that accretion of microbial turnover products is an important driver for isotopic carbon (C) and nitrogen (N) enrichment of soil organic matter (SOM). However, the exact contribution of arbuscular mycorrhizal fungi (AMF) to soil isotopic patterns remains unknown. in this study, we compared C-13 and N-15 patterns of glomalin-related soil protein (GRSP), which includes a main fraction derived from AMF, litter, and bulk soil in four temperate rainforests. GRSP was an abundant C and N pool in these forest soils, showing significant C-13 and N-15 enrichment relative to litter and bulk soil. Hence, cumulative accumulation of recalcitrant AMF turnover products in the soil profile likely contributes to C-13 and N-15 enrichment in forest soils. Further research on the relationship between GRSP and AMF should clarify the exact extent of this process. (C) 2009 Elsevier Ltd. All rights reserved.
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