文献类型：期刊文献

英文题名：Tree species mixing promotes surface soil organic carbon accumulation in mid-age and stability in old-growth forests

作者：Qin, Zhenkai[1,2] Nie, Yanxia[3] Ming, Angang[4,5] Yang, Kun[4,5] Min, Huilin[4,5] Wei, Hui[6] Shen, Weijun[1]

第一作者：Qin, Zhenkai

通信作者：Shen, WJ[1]

机构：[1]Guangxi Univ, Coll Forestry, Guangxi Key Lab Forest Ecol & Conservat, State Key Lab Conservat & Utilizat Agrobioresource, Nanning 530004, Guangxi, Peoples R China;[2]Guangxi Forestry Res Inst, Nanning 530002, Peoples R China;[3]Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Eco, South China Bot Garden, Guangzhou 510650, Peoples R China;[4]Chinese Acad Forestry, Expt Ctr Trop Forestry, Guangxi Youyiguan Forest Ecosyst Natl Observat & R, Pingxiang 532600, Peoples R China;[5]Chinese Acad Forestry, Expt Ctr Trop Forestry, Youyiguan Forest Ecosyst Observat & Res Stn Guangx, Pingxiang 532600, Peoples R China;[6]South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Peoples R China

年份：2024

外文期刊名：PLANT AND SOIL

收录：;Scopus(收录号：2-s2.0-85213393500);WOS:【SCI-EXPANDED(收录号:WOS:001383467200001)】；

基金：This research was financially supported by the National Natural Science Foundation of China (No. 32271847, 32071596 and 32071764), Guangxi Science and Technology Base and Talent Special Project (AD23026326), Natural Science Foundation of Guangxi Province (2020GXNSFAA297208), and Junwu Scholarship of Guangxi University (No. A3360051012). We are grateful to Drs. Jinhong He, Xiangping Tan, Zhanfeng Liu, and Xiaojuan Feng for their help in laboratory analysis.

语种：英文

外文关键词：Plant-derived carbon; Microbial-derived carbon; Particulate organic carbon; Mineral-associated carbon; Mixed-species forest; Monoculture forest

摘要：Background and aimsAfforestation or reforestation with mixed tree species is a promising strategy for carbon sequestration and climate change mitigation. However, whether soil organic carbon (SOC) stability in mixed-species forests (MF) is higher than that of monoculture forests (PF) is unclear.MethodsThe origin and stability of SOC were investigated using soil samples (1 m in depth) obtained from 12 pairs of monoculture and polyculture plots, which included four age classes.ResultsWe found that the contents of SOC and its components were higher in mixed-species forests than in monoculture forests, particularly in the 0-40 cm soil layer and middle-aged (33-45 years) PF. In middle-aged forests, the MF had a smaller percentage of microbial-derived C and mineral-associated organic carbon (MAOC) to total SOC ratio than those of PF. However, the ratio of MAOC to total SOC in the MF was considerably higher than that in old-aged PF (62 years), indicating that transforming old-aged PF into MF aids SOC stabilization. Mineral protection played a major role in influencing the accumulation of plant-derived C, microbial-derived C, and SOC fractions in the PF, whereas total nitrogen and ammonium nitrogen played a dominant role in the MF.ConclusionThis study provides new evidence that transforming single-species monocultures into mixed-species polycultures is beneficial for the accumulation and stabilization of SOC in subtropical forests and highlights that these effects depend on the influence of forest age and soil depth on organic carbon fractions.