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Constraints to nitrogen acquisition of terrestrial plants under elevated CO2

Journal article
Authors Zhaozhong Feng
Tobias Rütting
Håkan Pleijel
Göran Wallin
Peter B Reich
Claudia I Kammann
Paul C D Newton
Kazuhiko Kobayashi
Yunjian Luo
Johan Uddling
Published in Global Change Biology
Volume 21
Issue 8
Pages 3152-3168
ISSN 1354-1013
Publication year 2015
Published at Department of Earth Sciences
Department of Biological and Environmental Sciences
Pages 3152-3168
Language en
Links dx.doi.org/10.1111/gcb.12938
Keywords carbon dioxide, crops, diversity, fertilization, FACE, forest, grassland, growth dilution, meta-analysis, nitrogen
Subject categories Botany, Terrestrial ecology

Abstract

A key part of the uncertainty in terrestrial feedbacks on climate change is related to how and to what extent nitrogen (N) availability constrains the stimulation of terrestrial productivity by elevated CO2 (eCO2), and whether or not this constraint will become stronger over time. We explored the ecosystem-scale relationship between responses of plant productivity and N acquisition to eCO2 in Free-Air CO2 Enrichment (FACE) experiments in grassland, cropland and forest ecosystems and found that: (i) In all three ecosystem types, this relationship was positive, linear, and strong (r2 = 0.68), but exhibited a negative intercept such that plant N acquisition was decreased by 10% when eCO2 caused neutral or modest changes in productivity. Since the ecosystems were markedly N limited, plants with minimal productivity responses to eCO2 likely acquired less N than ambient CO2-grown counterparts because access was decreased, and not because demand was lower. (ii) Plant N concentration was lower under eCO2, and this decrease was independent of the presence or magnitude of eCO2-induced productivity enhancement, refuting the long-held hypothesis that this effect results from growth dilution. (iii) Effects of eCO2 on productivity and N acquisition did not diminish over time, while the typical eCO2-induced decrease in plant N concentration did. Our results suggest that, at the decennial time scale covered by FACE studies, N limitation of eCO2-induced terrestrial productivity enhancement is associated with negative effects of eCO2 on plant N acquisition rather than with growth dilution of plant N or processes leading to progressive N limitation.

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