Arbuscular Mycorrhizal Fungi Increase Organic Carbon Decomposition Under Elevated CO 2

Author:

Cheng Lei1,Booker Fitzgerald L.23,Tu Cong1,Burkey Kent O.23,Zhou Lishi14,Shew H. David1,Rufty Thomas W.3,Hu Shuijin1

Affiliation:

1. Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA.

2. United States Department of Agriculture, Agricultural Research Service, Plant Science Research Unit, Raleigh, NC 27607, USA.

3. Department of Crop Science, North Carolina State University, Raleigh, NC 27695, USA.

4. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Xiangshan, Beijing 100093, China.

Abstract

A Fungal Culprit to Carbon Loss In some ecosystems, such as in the layer of soil containing plant roots, fungi, and bacteria, increased levels of CO 2 should stimulate more efficient aboveground photosynthesis, which in turn should promote increased sequestration of organic carbon in soil through the protective action of arbuscular mycorrhizal fungi. However, in a series of field and microcosm experiments performed under elevated levels of CO 2 thought to be consistent with future emissions scenarios, Cheng et al. (p. 1084 ; see the Perspective by Kowalchuk ) observed that these fungi actually promote degradation of soil organic carbon, releasing more CO 2 in the process.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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