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标题：Plant stoichiometric responses to elevated CO2 vary with nitrogen and phosphorus inputs: Evidence from a global-scale meta-analysis
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作者：Wenjuan Huang ; Benjamin Z. Houlton ; Alison R. Marklein 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2016
卷号：5
期号：1
DOI：10.1038/srep18225
语种：English
出版社：Springer Nature
摘要：Rising levels of atmospheric CO₂ have been implicated in changes in the nitrogen (N) and phosphorus (P) content of terrestrial vegetation; however, questions remain over the role of C, N and P interactions in driving plant nutrient stoichiometry, particularly whether N and P additions alter vegetation responses to CO₂ enrichment singly. Here we use meta-analysis of 46 published studies to investigate the response of plant N and P to elevated CO₂ alone and in combination with nutrient (N and P) additions across temperate vs. tropical biomes. Elevated CO₂ reduces plant N concentrations more than plant P concentrations in total biomass pools, resulting in a significant decline in vegetation N/P. However, elevated CO₂ treatments in combination with N additions increase plant P concentrations, whereas P additions have no statistical effect on plant N concentrations under CO₂ enrichment. These results point to compensatory but asymmetrical interactions between N, P and CO₂; that changes in N rapidly alter the availability of P, but not the converse, in response to increased CO₂. Our finding implies widespread N limitation with increasing atmospheric CO₂ concentrations alone. We also suggest that increased anthropogenic N deposition inputs could enhance plant N and P in a progressively CO₂-enriched biosphere.