文献类型：期刊文献

英文题名：Topsoil organic carbon increases but its stability declines after five years of reduced throughfall

作者：Yang, Yujing[1,2] Liu, Shirong[2] Schindlbacher, Andreas[3] Wang, Jingxin[4] Li, Zhongqiang[1] Wang, Hui[2] Ming, Angang[5] Lu, Lihua[5] Li, Zhaoying[5]

第一作者：Yang, Yujing

通信作者：Liu, SR[1]

机构：[1]Hubei Univ, Fac Resources & Environm Sci, Hubei Key Lab Reg Dev & Environm Response, Wuhan 430062, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forest Ecol Environm & Protect, Key Lab Forest Ecol & Environm, Natl Forestry & Grassland Adm, Beijing 100091, Peoples R China;[3]Fed Res & Training Ctr Forests Nat Hazards & Land, Dept Forest Ecol, A-1131 Vienna, Austria;[4]West Virginia Univ, Div Forestry & Nat Resources, POB 6215, Morgantown, WV 26506 USA;[5]Chinese Acad Forestry, Expt Ctr Trop Forestry, Guangxi Youyiguan Forest Ecosyst Res Stn, Pingxiang 532600, Peoples R China

年份：2021

卷号：156

外文期刊名：SOIL BIOLOGY & BIOCHEMISTRY

收录：;EI(收录号：20211410159897);Scopus(收录号：2-s2.0-85103324353);WOS:【SCI-EXPANDED(收录号:WOS:000640189100037)】；

基金：We would like to thank the Guangxi Youyiguan Forest Ecosystem Research Station for experimental maintenance and logistical support. This research was supported by the Natural Science Foundation of China (32001298, 31930078), Fundamental Research Funds of CAF, China (CAFYBB2020ZA001), Open Fund of Hubei Key Laboratory of Regional Development and Environmental Response, China (2019(C)001), and Youth Science Foundation of Hubei University, China (201910804000005), and CFERN & GENE Award Funds on Ecological Paper.

语种：英文

外文关键词：Soil organic carbon; SOC stability; Subtropical forest; Pinus massoniana; Precipitation manipulation; Microbial community structure

摘要：Climate change alters the regional precipitation pattern and causes seasonal droughts that affect forest growth and belowground carbon cycling. This is expected to create greater oscillations in soil moisture that affect the stability of the soil organic carbon (SOC) pool. This study examined the effects of the precipitation decline on the SOC dynamics by experimentally controlling the throughfall in a Pinus massoniana plantation in subtropical region of China. Soil physicochemical properties were analyzed in topsoil (0-5cm depth) during the dry-cool and the wet-warm season after five consecutive years of similar to 30% throughfall reduction. We also assessed the SOC stock and its stability, as indicated by the easily oxidizable carbon (EOC) pool, SOC mineralization rates, soil aggregate size distributions and fine root biomass in relation to soil microbial community structure. The throughfall reduction reduced the soil moisture by 15-20% between sampling dates, with an average 18% during the five-year experiment. With throughfall reduction, topsoil SOC stocks significantly increased by 0.18 kg C m(-2) or 10%, but fine root biomass, EOC content, and the micro-aggregate fraction were significantly higher, suggesting less stable SOC. The abundance of bacterial r-strategists (e.g. Bacteroidetes, Betaproteobacteria, and Gammaproteobacteria) increased significantly while K-strategists (e.g. Planctomycetes) decreased. Both SOC and EOC mineralization were positively correlated with the abundance of r-strategists, but negatively correlated with the K-strategists abundance. We posit that micro-aggregates, fine root biomass, and altered microbial strategist ratios are associated with the decline in SOC stability in forests with less throughfall.