Resource stoichiometry and the biogeochemical consequences of nitrogen deposition in a mixed deciduous forest

Midgley, Meghan G.; Phillips, Richard P.

doi:10.1002/ecy.1595

Title: Resource stoichiometry and the biogeochemical consequences of nitrogen deposition in a mixed deciduous forest

Journal Article · 02 December 2016 · Ecology

DOI: https://doi.org/10.1002/ecy.1595 · OSTI ID:1400589

Midgley, Meghan G. ^[1]; Phillips, Richard P. ^[2]

Department of Biology Indiana University Jordan Hall, 1001 E. Third Street Bloomington Indiana 47405 USA, The Morton Arboretum 4100 Illinois Route 53 Lisle Illinois 60532 USA
Department of Biology Indiana University Jordan Hall, 1001 E. Third Street Bloomington Indiana 47405 USA

Abstract Ecosystems often show differential sensitivity to chronic nitrogen (N) deposition; hence, a critical challenge is to improve our understanding of how and why site‐specific factors mediate biogeochemical responses to N enrichment. We examined the extent to which N impacts on soil carbon (C) and N dynamics depend on microbial resource stoichiometry. We added N to forest plots dominated by ectomycorrhizal ( ECM ) trees, which have litter and soil pools rich in organic N and relatively wide C:N ratios, and adjacent forest plots dominated by arbuscular mycorrhizal ( AM ) trees, which have litter and soil pools rich in inorganic N and relatively narrow C:N ratios. While microbes in both plot types exhibited fairly strict biomass homeostasis, microbes in AM ‐ and ECM ‐dominated plots differed in their physiological responses to N addition. Microbes in ECM plots responded to N enrichment by decreasing their investment in N‐acquisition enzymes (relative to C‐acquisition enzymes) and increasing N mineralization rates (relative to C mineralization rates), suggesting that N addition alleviated microbial N demand. In contrast, heterotrophic microbial activities in AM plots were unaffected by N addition, most likely as a result of N‐induced increases in net nitrification (60% increase relative to control plots) and nitrate mobilization (e.g., sixfold increases in mobilization relative to control plots). Combined, our findings suggest the stoichiometric differences between AM and ECM soils are the primary drivers of the observed responses. Plant and microbial communities characterized by wide C:N are more susceptible to N‐induced changes in decomposition and soil C dynamics, whereas communities characterized by narrow C:N are more susceptible to N‐induced nitrate leaching losses. Hence, the biogeochemical consequences of N deposition in temperate forests may be driven by the stoichiometry of the dominant trees and their associated microbes.

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Sponsoring Organization:: USDOE

OSTI ID:: 1400589

Journal Information:: Ecology, Journal Name: Ecology Journal Issue: 12 Vol. 97; ISSN 0012-9658

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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