文献类型：期刊文献

英文题名：Divergent factors shape the stability of Pinus massoniana rhizosphere organic carbon in subtropical mixed plantations

作者：Xia, Qi[1] Liu, Shirong[1] Nie, Xiuqing[1] Chen, Yiqun[1] Wang, Hui[1] Niu, Baoliang[1] Ming, Angang[2,3]

第一作者：Xia, Qi

通信作者：Liu, SR[1]

机构：[1]Natl Forestry & Grassland Adm, Ecol & Nat Conservat Inst, Chinese Acad Forestry, Key Lab Forest Ecol & Environm, Beijing 100091, Peoples R China;[2]Guangxi Youyiguan Forest Ecosyst Natl Observat & R, Youyiguan Forest Ecosyst Observat & Res Stn Guangx, Pingxiang 532600, Guangxi, Peoples R China;[3]Chinese Acad Forestry, Expt Ctr Trop Forestry, Guangxi Youyiguan Forest Ecosyst Natl Observat & R, Youyiguan Forest Ecosyst Observat & Res Stn Guangx, Pingxiang 532600, Peoples R China

年份：2026

卷号：37

期号：1

外文期刊名：JOURNAL OF FORESTRY RESEARCH

收录：;EI(收录号：20260820116119);WOS:【SCI-EXPANDED(收录号:WOS:001699214700003)】；

基金：: This study was supported by the National Key Research and Development Program of China (2021YFD2200405) and the National Natural Science Foundation of China (31930078).

语种：英文

外文关键词：Mixed-species; Rhizosphere SOC stability; Root exudation inputs; Root morphological traits; Available nitrogen

摘要：Mixed-species plantations potentially alter the stability of soil organic carbon (SOC), playing a crucial role in SOC sequestration. However, how tree species mixtures affect root and rhizosphere soil characteristics and further shape rhizosphere SOC stability are not fully understood. In this study, the effects of mixed-species plantations on rhizosphere SOC stability through root exudation, root morphological traits, rhizosphere properties and microbial biomass carbon were investigated in a Pinus massoniana monoculture and two paired plantations interplanted with Erythrophleum fordii (a nitrogen-fixing species) and Castanopsis hystrix. Our findings show that when interplanting with C. hystrix, root exudation of P. massoniana increased significantly, which was positively correlated with increases in mass proportion (+ 38% and + 11%) and carbon contents (+ 77% and + 12%) of large and small macro-aggregates in the P. massoniana rhizosphere. This suggests that root morphological traits and exudation inputs largely affected P. massoniana rhizosphere SOC stability. When interplanting with E. fordii, there was no significant increase in root exudation and no correlations between rhizosphere aggregate mass proportion, carbon content and root exudation rates, while available nitrogen attributed to P. massoniana rhizosphere SOC stability. Our results suggest divergent mechanisms underlying P. massoniana rhizosphere SOC stability in mixed-species plantations with different companion species, and highlight the critical role of selecting appropriate companion species in improving SOC stabilization of mixed-species plantations.