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Ecosystem responses to elevated CO2 governed by plant-soil interactions and the cost of nitrogen acquisition.
File | Description | Size | Format | |
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Tansley_3.0_clean.docx | Accepted version | 3.34 MB | Microsoft Word | View/Open |
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) N2-fixation mycorrhizas nitrogen photosynthesis 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 |