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

作　　者：Tongshuo BAI Yunpeng QIU Shuijin HU 

机构地区：[1]Ecosystem Ecology Laboratory,College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China [2]Department of Entomology&Plant Pathology,North Carolina State University,Raleigh NC 27695,USA

出　　处：《Pedosphere》2024年第2期289-296,共8页土壤圈（英文版）

基　　金：supported by China Postdoctoral Science Foundation(No.2023M741742);the National Key R&D Program of China(No.2023YFD1501600);Jiangsu Funding Program for Excellent Postdoctoral Talent,China(No.2023ZB122);the National Natural Science Foundation of China(No.32371626)。

摘　　要：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.

关 键 词：arbuscular mycorrhizal fungi ectomycorrhizal fungi leaf litter leguminous plant mycorhizosphere RHIZOSPHERE root litter soil C:N ratio 

分 类 号：S153.6[农业科学—土壤学] S154.3[农业科学—农业基础科学]