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Ecosystem responses to elevated CO2 governed by plant-soil interactions and the cost of nitrogen acquisition.

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Title: Ecosystem responses to elevated CO2 governed by plant-soil interactions and the cost of nitrogen acquisition.
Authors: Terrer, C
Vicca, S
Stocker, BD
Hungate, BA
Phillips, RP
Reich, PB
Finzi, AC
Prentice, IC
Item Type: Journal Article
Abstract: Contents Summary I. II. III. IV. References SUMMARY: Land ecosystems sequester on average about a quarter of anthropogenic CO2 emissions. It has been proposed that nitrogen (N) availability will exert an increasingly limiting effect on plants' ability to store additional carbon (C) under rising CO2 , but these mechanisms are not well understood. Here, we review findings from elevated CO2 experiments using a plant economics framework, highlighting how ecosystem responses to elevated CO2 may depend on the costs and benefits of plant interactions with mycorrhizal fungi and symbiotic N-fixing microbes. We found that N-acquisition efficiency is positively correlated with leaf-level photosynthetic capacity and plant growth, and negatively with soil C storage. Plants that associate with ectomycorrhizal fungi and N-fixers may acquire N at a lower cost than plants associated with arbuscular mycorrhizal fungi. However, the additional growth in ectomycorrhizal plants is partly offset by decreases in soil C pools via priming. Collectively, our results indicate that predictive models aimed at quantifying C cycle feedbacks to global change may be improved by treating N as a resource that can be acquired by plants in exchange for energy, with different costs depending on plant interactions with microbial symbionts.
Issue Date: 6-Nov-2017
Date of Acceptance: 5-Sep-2017
URI: http://hdl.handle.net/10044/1/54311
DOI: https://dx.doi.org/10.1111/nph.14872
ISSN: 0028-646X
Publisher: Wiley
Start Page: 507
End Page: 522
Journal / Book Title: New Phytologist
Volume: 217
Issue: 2
Copyright Statement: © 2017 The Authors. New Phytologist © 2017 New Phytologist Trust. This is the accepted version of the following article, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/nph.14872/abstract
Sponsor/Funder: AXA Research Fund
Funder's Grant Number: AXA Chair Programme in Biosphere and Climate Impacts
Keywords: CO 2
Free-Air CO2 enrichment (FACE)
soil carbon
soil organic matter (SOM)
06 Biological Sciences
07 Agricultural And Veterinary Sciences
Plant Biology & Botany
Publication Status: Published
Appears in Collections:Department of Life Sciences
Faculty of Natural Sciences