Mechanisms Underlying the Regulation of Soil Nitrous Oxide Emissions by Arbuscular Mycorrhizal Fungi

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National Natural Science Foundation

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    Nitrogen, the major limiting factor of primary production in terrestrial ecosystem, contributes greatly to crop production since the invention of Haber-Bosch process. However, a substantial of nitrogen is lost to the surrounding environment, leading to low nitrogen use efficiency, nitrogen deposition, nitrate runoff and N2O emission. The microbial groups of nitrogen fixers, nitrifier and denitrifier carry out nitrogen fixation, nitrification and denitrification, respectively. Another group of symbiotic fungi, Arbuscular mycorrhizal fungi (AMF), is also found to be important for nitrogen cycling. Recent studies reported that AMF could significantly affect soil nitrification, denitrification and N2O emission. This review summarized the advance in the mechanisms by which AMF reduce N2O emission:(I) AMF inhibit nitrifier activities and reduce N2O production; (II) AMF exude labile carbon compounds to alleviate the competence between N2OR and other Nr reductase, which promotes N2O reduction to a greater extent; (III) AMF take up soil nitrogen and deliver them to host-plant and thus decrease nitrogen availability, lowering N2O production. Finally, we envisaged future studies in strengthening the role of indigenous AMF in reducing N2O emission. This review provides scientific evidence for future application of AMF in regulating N2O emission and N cycling.

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HE Guang, LI Xia, ZHAO Ruotong, ZHANG Junling. Mechanisms Underlying the Regulation of Soil Nitrous Oxide Emissions by Arbuscular Mycorrhizal Fungi[J]. Acta Pedologica Sinica,2021,58(1):23-30.

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  • Received:July 01,2019
  • Revised:October 16,2019
  • Adopted:December 26,2019
  • Online: October 30,2020
  • Published: January 11,2021