文献类型：期刊文献

英文题名：Experimental warming reduced topsoil carbon content and increased soil bacterial diversity in a subtropical planted forest

作者：Wang, Hui[1] Liu, Shirong[1] Schindlbacher, Andreas[2] Wang, Jingxin[3] Yang, Yujing[1] Song, Zhanchao[1] You, Yeming[4] Shi, Zuomin[1] Li, Zhaoying[5] Chen, Lin[5] Ming, Angang[5] Lu, Lihua[5] Cai, Daoxiong[5]

通信作者：Liu, S[1]

机构：[1]Chinese Acad Forestry, Inst Forest Ecol Environm & Protect, Key Lab Forest Ecol & Environm, Chinas Natl Forestry & Grassland Adm, 2 Dongxiaofu, Beijing 100091, Peoples R China;[2]Ecol Fed Res & Training Ctr Forests Nat Hazards &, Dept Forest Ecol, A-1131 Vienna, Austria;[3]West Virginia Univ, Div Forestry & Nat Resources, POB 6215, Morgantown, WV 26506 USA;[4]Guangxi Univ, Coll Forestry, Nanning 530004, Guangxi, Peoples R China;[5]Chinese Acad Forestry, Expt Ctr Trop Forestry, Guangxi Youyiguan Forest Ecosyst Res Stn, Pingxiang 532600, Guangxi, Peoples R China

年份：2019

卷号：133

起止页码：155-164

外文期刊名：SOIL BIOLOGY & BIOCHEMISTRY

收录：;EI(收录号：20191306691041);Scopus(收录号：2-s2.0-85063357709);WOS:【SCI-EXPANDED(收录号:WOS:000487001800018)】；

基金：We would like to thank the Guangxi Youyiguan Forest Ecosystem Research Station for experimental and logistical support, as well as H Chen, RM He, Y Nong, C Liang, JT Wu, Z Zhao, and DW Huang for assistance with fieldwork and warming equipment maintenance. We also appreciate the help provided by Dr. SQ Wan in the experimental design. This work was supported by grants from the National Natural Science Foundation of China (31470627, 31290223), the Fundamental Research Funds of Chinese Academy of Forestry (CAFYBB2017QB004, CAFYBB2018SZ005) and the Ministry of Science and Technology of China (2018YFC0507305, 2017YFC0505006).

语种：英文

外文关键词：Soil warming; Microbial diversity; Microbial community composition; Subtropical plantation; Soil organic carbon; Soil carbon quality

摘要：The potential effects of global warming on the soil carbon (C) dynamics of subtropical forests are uncertain. To assess the effects of warming on soil C and tree roots, combined soil warming (infrared heaters, +1.5 degrees C soil temperature) and trenching experiments were conducted in a subtropical Castanopsis hystrix plantation. Topsoil C content was reassessed after five years of warming, and the effects on soil organic carbon (SOC) quality and microbial diversity were analyzed. Compared with corresponding controls, the topsoil (0-10 cm) SOC content was significantly lower in un-trenched warmed soil (-13.6%) as well as in trenched warmed soil (-15.4%). However, the range of SOC content after five years of warming was similar to that observed after two years of warming (-14.6%, -19.2%), indicating that the warming effect on SOC content had leveled off during the latter three years of the study. In trenched plots, warming significantly decreased the carbohydrate C as well as the ratio of carbohydrate C to N-alkyl/methoxyl C (CC/MC), suggesting that labile C was preferentially decomposed. In un-trenched plots, SOC quality was unaffected, indicating a compensatory input of labile root C. Bacterial a-diversity increased under warming, whereas no significant warming effects on fungal community diversity were observed. Both the SOC content and the proportion of soil carbohydrate C were negatively correlated with soil bacterial a-diversity, suggesting that the abundance of more recalcitrant SOC increased soil microbial diversity. Overall, our study indicates that soil warming leads to moderate initial reductions in topsoil SOC in the studied forest ecosystem. This is consistent with recent evidence that low SOC-containing soils (e.g., subtropical forest soils) exhibit a weaker response to soil warming than high SOC-containing soils.