首页|Nitrogen availability mediates the effects of roots and mycorrhizal fungi on soil organic carbon decomposition:A meta-analysis

Nitrogen availability mediates the effects of roots and mycorrhizal fungi on soil organic carbon decomposition:A meta-analysis

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Plant roots and their associated mycorrhizal fungi critically mediate the decomposition of soil organic carbon(C),but the general patterns of their impacts over a broad geographical range and the primary mediating factors remain unclear.Based on a synthesis of 596 paired observations from both field and greenhouse experiments,we found that living roots and/or mycorrhizal fungi increased organic C decomposition by 30.9％,but low soil nitrogen(N)availability(i.e.,high soil C∶N ratio)critically mitigated this promotion effect.In addition,the positive effects of living roots and/or mycorrhizal fungi on organic C decomposition were higher under herbaceous and leguminous plants than under woody and non-leguminous plants,respectively.Surprisingly,there was no significant difference between arbuscular mycorrhizal fungi and ectomycorrhizal fungi in their effects on organic C decomposition.Furthermore,roots and/or mycorrhizal fungi significantly enhanced the decomposition of leaf litter but not root litter.These findings advance our understanding of how roots and their symbiotic fungi modulate soil C dynamics in the rhizosphere or mycorrhizosphere and may help improve predictions of soil global C balance under a changing climate.

arbuscular mycorrhizal fungiectomycorrhizal fungileaf litterleguminous plantmycorrhizosphererhizosphereroot littersoil C∶N ratio

Tongshuo BAI、Yunpeng QIU、Shuijin HU

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Ecosystem Ecology Laboratory,College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095(China)

Department of Entomology & Plant Pathology,North Carolina State University,Raleigh NC 27695(USA)

中国博士后科学基金国家重点研发计划Jiangsu Funding Program for Excellent Postdoctoral Talent,China国家自然科学基金

2023M7417422023YFD15016002023ZB12232371626

2024

10.1016/j.pedsph.2024.02.007

土壤圈(英文版)
中国土壤学会,中科院南京土壤研究所和土壤与农业可持续发展国家重点实验室

土壤圈(英文版)

CSTPCD
影响因子：0.477
ISSN：1002-0160
年,卷(期)：2024.34(2)