Anthropogenic N deposition alters soil organic matter biochemistry and microbial communities on decaying fine roots

Argiroff, William A.; Zak, Donald R.; Upchurch, Rima A.; Salley, Sydney O.; Grandy, A. Stuart

doi:10.1111/gcb.14770

Title: Anthropogenic N deposition alters soil organic matter biochemistry and microbial communities on decaying fine roots

Journal Article · Wed Aug 14 00:00:00 EDT 2019 · Global Change Biology

DOI:https://doi.org/10.1111/gcb.14770· OSTI ID:1557335

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School for Environment and Sustainability University of Michigan Ann Arbor MI USA
School for Environment and Sustainability University of Michigan Ann Arbor MI USA, Department of Ecology and Evolutionary Biology University of Michigan Ann Arbor MI USA
Department of Natural Resources and the Environment University of New Hampshire Durham NH USA

Abstract Fine root litter is a primary source of soil organic matter (SOM), which is a globally important pool of C that is responsive to climate change. We previously established that ~20 years of experimental nitrogen (N) deposition has slowed fine root decay and increased the storage of soil carbon (C; +18%) across a widespread northern hardwood forest ecosystem. However, the microbial mechanisms that have directly slowed fine root decay are unknown. Here, we show that experimental N deposition has decreased the relative abundance of Agaricales fungi (−31%) and increased that of partially ligninolytic Actinobacteria (+24%) on decaying fine roots. Moreover, experimental N deposition has increased the relative abundance of lignin‐derived compounds residing in SOM (+53%), and this biochemical response is significantly related to shifts in both fungal and bacterial community composition. Specifically, the accumulation of lignin‐derived compounds in SOM is negatively related to the relative abundance of ligninolytic Mycena and Kuehneromyces fungi, and positively related to Microbacteriaceae. Our findings suggest that by altering the composition of microbial communities on decaying fine roots such that their capacity for lignin degradation is reduced, experimental N deposition has slowed fine root litter decay, and increased the contribution of lignin‐derived compounds from fine roots to SOM. The microbial responses we observed may explain widespread findings that anthropogenic N deposition increases soil C storage in terrestrial ecosystems. More broadly, our findings directly link composition to function in soil microbial communities, and implicate compositional shifts in mediating biogeochemical processes of global significance.

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Sponsoring Organization:: USDOE

OSTI ID:: 1557335

Journal Information:: Global Change Biology, Journal Name: Global Change Biology Vol. 25 Journal Issue: 12; ISSN 1354-1013

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 27 works

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