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Pàgina inicial > Articles > Articles publicats > Ecosystem responses to elevated CO₂ governed by plant-soil interactions and the cost of nitrogen acquisition |
Data: | 2018 |
Resum: | Contents Summary 507 I. Introduction 507 II. The return on investment approach 508 III. CO₂ response spectrum 510 IV. Discussion 516 Acknowledgements 518 References 518 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. |
Ajuts: | European Commission 701329 European Commission 610028 |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Matèria: | CO₂ ; Free-Air CO₂ enrichment (FACE) ; N₂-fixation; ; Mycorrhizas ; Nitrogen ; Photosynthesis ; Soil carbon ; Soil organic matter (SOM) |
Publicat a: | The new phytologist, Vol. 217, issue 2 (Jan. 2018) , p. 507-522, ISSN 1469-8137 |
Post-print 33 p, 3.0 MB |