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Ecosystem responses to elevated <scp>CO</scp> 2 governed by plant–soil interactions and the cost of nitrogen acquisition
- Source :
- New phytologist, New Phytologist
- Publication Year :
- 2017
- Publisher :
- Wiley, 2017.
-
Abstract
- 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.
- Subjects :
- 0106 biological sciences
010504 meteorology & atmospheric sciences
Physiology
Plant Biology & Botany
Plant Science
Biology
Photosynthesis
01 natural sciences
nitrogen
Ectosymbiosis
soil organic matter (SOM)
Ecosystem
soil carbon
N2-fixation
Free-Air CO2 enrichment (FACE)
0105 earth and related environmental sciences
2. Zero hunger
photosynthesis
Ecology
Soil organic matter
fungi
food and beverages
Global change
mycorrhizas
Soil carbon
06 Biological Sciences
15. Life on land
Photosynthetic capacity
Agronomy
13. Climate action
CO 2
07 Agricultural And Veterinary Sciences
Offset (botany)
010606 plant biology & botany
Subjects
Details
- ISSN :
- 14698137 and 0028646X
- Volume :
- 217
- Database :
- OpenAIRE
- Journal :
- New Phytologist
- Accession number :
- edsair.doi.dedup.....d77f6bae3f5618623c30a9d2d3fe2804
- Full Text :
- https://doi.org/10.1111/nph.14872