Feedbacks between plant N demand and rhizosphere priming depend on type of mycorrhizal association

Sulman, Benjamin N.; Brzostek, Edward R.; Medici, Chiara; Shevliakova, Elena; Menge, Duncan N. L.; Phillips, Richard P.; Cleland, ed., Elsa

doi:10.1111/ele.12802

Feedbacks between plant N demand and rhizosphere priming depend on type of mycorrhizal association

Journal Article · Sun Jul 02 00:00:00 EDT 2017 · Ecology Letters

DOI:https://doi.org/10.1111/ele.12802· OSTI ID:1400631

Sulman, Benjamin N. ^[1]; Brzostek, Edward R. ^[2]; Medici, Chiara ^[3]; Shevliakova, Elena ^[4]; Menge, Duncan N. L. ^[5]; Phillips, Richard P. ^[6]; Cleland, ed., Elsa

Program in Atmospheric and Oceanic Sciences Department of Geosciences Princeton University Princeton New Jersey USA
Department of Biology West Virginia University Morgantown WV USA
Princeton Environmental Institute Princeton University Princeton NJ USA
NOAA Geophysical Fluid Dynamics Laboratory Princeton NJ USA
Department of Ecology, Evolution and Environmental Biology Columbia University New York NY USA
Department of Biology Indiana University Bloomington IN USA

Abstract

Ecosystem carbon (C) balance is hypothesised to be sensitive to the mycorrhizal strategies that plants use to acquire nutrients. To test this idea, we coupled an optimality‐based plant nitrogen (N) acquisition model with a microbe‐focused soil organic matter ( SOM ) model. The model accurately predicted rhizosphere processes and C–N dynamics across a gradient of stands varying in their relative abundance of arbuscular mycorrhizal ( AM ) and ectomycorrhizal ( ECM ) trees. When mycorrhizal dominance was switched – ECM trees dominating plots previously occupied by AM trees, and vice versa – legacy effects were apparent, with consequences for both C and N stocks in soil. Under elevated productivity, ECM trees enhanced decomposition more than AM trees via microbial priming of unprotected SOM . Collectively, our results show that ecosystem responses to global change may hinge on the balance between rhizosphere priming and SOM protection, and highlight the importance of dynamically linking plants and microbes in terrestrial biosphere models.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1400631

Alternate ID(s):: OSTI ID: 1536726

Journal Information:: Ecology Letters, Journal Name: Ecology Letters Journal Issue: 8 Vol. 20; ISSN 1461-023X

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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