文献类型：期刊文献

英文题名：Root functional traits mediate rhizosphere soil carbon stability in a subtropical forest

作者：Xu, Haidong[1] Zhu, Biao[2,3] Wei, Xiaomeng[4,5] Yu, Mukui[1] Cheng, Xiangrong[1]

第一作者：Xu, Haidong

通信作者：Cheng, XR[1]

机构：[1]Chinese Acad Forestry, Inst Subtrop Forestry, East China Coastal Forest Ecosyst Res Stn, Hangzhou 311400, Zhejiang, Peoples R China;[2]Peking Univ, Coll Urban & Environm Sci, Inst Ecol, Beijing 100871, Peoples R China;[3]Peking Univ, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China;[4]Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Peoples R China;[5]Chinese Acad Sci, Inst Subtrop Agr, Changsha Observat & Res Stn Agr Environm, Changsha 410125, Peoples R China

年份：2021

卷号：162

外文期刊名：SOIL BIOLOGY & BIOCHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000715291100001)】；

基金：This study was supported by the National Key Research andDevelopment Program of China (2017YFC0505502 and 2017YFC0505506) and the Project of Public Welfare Technology Research in Zhejiang Province (LGN21C160010) . We appreciate the constructive comments and insightful suggestions from two anonymous reviewers and the handling editor that significantly improved this manuscript. We also thank Haijing Yuan, Wang Xiang, Chenyang Lou and Yangyang Zhang for assistance in field sampling and laboratory analyses.

语种：英文

外文关键词：Acquisitive trees; Conservative trees; Mineral-associated organic carbon; Root functional traits; Rhizosphere process

摘要：Plants can be classified as either resource-acquisitive or resource-conservative strategies based on their root traits. Compared with conservative trees, acquisitive trees produce larger amounts of readily decomposable carbon, owing to their high specific root length and low root C:N ratio, which could reduce the content and stability of soil organic carbon (SOC). In this study, we assessed the content of labile particulate organic carbon (POC) and stable mineral-associated organic carbon (MAOC) in the rhizosphere and bulk soils of acquisitive and conservative trees in a subtropical forest. Contrary to our expectations, we found that SOC content in the rhizosphere soil of acquisitive trees (26 g kg(-1)) was 53% higher than that in the rhizosphere soil of conservative trees (17 g kg(-1)), which was mainly attributed to an approximately 1-fold higher MAOC content. Correlation and structural equation modeling analyses indicated that this rhizosphere MAOC was primarily derived from roots and associated with higher specific root length, rhizosphere soil microbial biomass C, and enzyme C:N ratio, whereas the POC was mainly derived from aboveground litter. We further found that the contrasting plant strategies had no significant influence on the POC content of bulk or rhizosphere soil, which could be ascribed to the similar properties of aboveground litter of acquisitive and conservative trees. These findings indicate that acquisitive trees enhance rhizosphere soil C stability primarily via the mediation of root traits and highlight the necessity of considering plant ecological strategies when assessing the effects of tree species on soil C content and stability.