Mediation of soil C decomposition by arbuscular mycorrizhal fungi in grass rhizospheres under elevated CO2
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- 作者：Yolima Carrillo ; Feike A. Dijkstra ; Dan LeCain ; Elise Pendall
- 关键词：Arbuscular mycorrhizae ; Decomposition ; Elevated CO2 ; Grasses ; Priming ; Rhizosphere
- 刊名：Biogeochemistry
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：127
- 期：1
- 页码：45-55
- 全文大小：644 KB
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Feike A. Dijkstra (2)
Dan LeCain (3)
Elise Pendall (1) (4)
1. Hawkesbury Institute for the Environment, Western Sydney University, Richmond, NSW, Australia
2. Faculty of Agriculture and Environment, Center for Carbon, Water and Food, University of Sydney, Camden, NSW, Australia
3. USDA, Agricultural Research Service, Fort Collins, CO, USA
4. Department of Botany, University of Wyoming, Laramie, Wyoming, USA - 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Geochemistry
Biochemistry
Soil Science and Conservation
Terrestrial Pollution - 出版者：Springer Netherlands
- ISSN：1573-515X
文摘
Arbuscular mycorrhizal (AMF) function has mostly been studied from the plant perspective, but there is a shortage of empirical assessments of their ecosystem level impacts on soil carbon (C). Our understanding of the role of AMF on C processing belowground has been restricted mostly to fresh plant residues, not stabilized soil organic matter. The mechanisms by which elevated CO2 (eCO2) alter soil C remain an open question but AMF likely play a role via C and nutrients, which could in turn, be plant species dependent. We assessed AMF as mediators of C processing in the rhizosphere of two grasses under eCO2. We exposed a C4 and a C3 grass to a combination of ambient and eCO2 with and without modification of the AMF communities and using stable isotopes quantified the respiration of native soil C (as rhizosphere priming), its contribution to dissolved and microbial C and the final remaining C pool. The AMF treatment impacted soil C respiration under the C3-plant and only under eCO2. eCO2 suppressed decomposition (negative priming) but this effect disappeared when the AMF community was reduced. In contrast to studies of fresh plant residues suggesting that AMF can enhance C loss, our observations indicate that AMF may promote C storage in the soil organic matter pool. Results support that AMF can mediate the effect of eCO2 on soil C in the rhizosphere of some plant species, a potential mechanism explaining variation in impacts of eCO2 on soil C storage and C balances across species and ecosystems. Keywords Arbuscular mycorrhizae Decomposition Elevated CO2 Grasses Priming Rhizosphere