Shifts in bacterial traits under chronic nitrogen deposition align with soil processes in arbuscular, but not ectomycorrhizal‐associated trees

Author:

Piñeiro Juan12ORCID,Dang Chansotheary1ORCID,Walkup Jeth G. V.1ORCID,Kuzniar Teagan1ORCID,Winslett Rachel1,Blazewicz Steven J.3ORCID,Freedman Zachary B.4ORCID,Brzostek Edward5ORCID,Morrissey Ember M.1ORCID

Affiliation:

1. Division of Plant and Soil Sciences West Virginia University Morgantown West Virginia USA

2. School of Forest Engineering and Natural Resources Polytechnic University of Madrid Madrid Spain

3. Lawrence Livermore National Laboratory Livermore California USA

4. Department of Soil Science University of Wisconsin‐Madison Madison Wisconsin USA

5. Department of Biology West Virginia University Morgantown West Virginia USA

Abstract

AbstractNitrogen (N) deposition increases soil carbon (C) storage by reducing microbial activity. These effects vary in soil beneath trees that associate with arbuscular (AM) and ectomycorrhizal (ECM) fungi. Variation in carbon C and N uptake traits among microbes may explain differences in soil nutrient cycling between mycorrhizal associations in response to high N loads, a mechanism not previously examined due to methodological limitations. Here, we used quantitative Stable Isotope Probing (qSIP) to measure bacterial C and N assimilation rates from an added organic compound, which we conceptualize as functional traits. As such, we applied a trait‐based approach to explore whether variation in assimilation rates of bacterial taxa can inform shifts in soil function under chronic N deposition. We show taxon‐specific and community‐wide declines of bacterial C and N uptake under chronic N deposition in both AM and ECM soils. N deposition‐induced reductions in microbial activity were mirrored by declines in soil organic matter mineralization rates in AM but not ECM soils. Our findings suggest C and N uptake traits of bacterial communities can predict C cycling feedbacks to N deposition in AM soils, but additional data, for instance on the traits of fungi, may be needed to connect microbial traits with soil C and N cycling in ECM systems. Our study also highlights the potential of employing qSIP in conjunction with trait‐based analytical approaches to inform how ecological processes of microbial communities influence soil functioning.

Funder

Ministerio de Ciencia e Innovación

National Science Foundation

Office of Science

Publisher

Wiley

Subject

General Environmental Science,Ecology,Environmental Chemistry,Global and Planetary Change

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