文献类型：期刊文献

英文题名：Soil microbial community dynamics mediate the priming effects caused by in situ decomposition of fresh plant residues

作者：Yu, Guangcan[1] Zhao, Houben[1] Chen, Jie[1] Zhang, Tianlin[1] Cai, Zhanglin[1] Zhou, Guangyi[1] Li, Zhaojia[1] Qiu, Zhijun[1] Wu, Zhongmin[1]

第一作者：Yu, Guangcan

通信作者：Wu, ZM[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China

年份：2020

卷号：737

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20202208758001);Scopus(收录号：2-s2.0-85085273417);WOS:【SCI-EXPANDED(收录号:WOS:000553728100009)】；

基金：Thiswork was financially supported by the National Natural Science Foundation of China (31972938), the Basic Science Foundation of Research Institute of Tropical Forestry, Chinese Academy of Forestry (CAFYBB2017ZX002), the National Natural Science Foundation of China (31770664).

语种：英文

外文关键词：Carbon cycling; Global climate change; Hypoxia; Isotope labeling; Litter decomposition; Microbial composition

摘要：Extreme climate events always leave numerous fresh plant materials (FOM) in forests, thus increasing the input of carbon (C) resources to soil system. The input of exogenous C may accelerate or inhibit the decomposition of soil organic carbon (SOC), which is defined as the positive or negative priming effect (PE), respectively. However, the characteristics and microbial mechanisms of PE caused by FOM remain unknown. A 110-day in situ soil incubation experiment was conducted in a subtropical forest, with C-13-labeled fresh leaves from four native species (Castanopsis fissa, CF; Pinus massoniana, PM; Machilus chekiangensis, MC; and Castonopsis chinensi.s, CC) serving as the FOM respectively. We measured the CO2 effluxes derived from C-13-labeled FOM and soil, and the composition and diversity of soil bacterial and fungal communities throughout the incubation to explore the correlations between PE and microbial attributes. As a result, the PE caused by FOM inputs were negative initially but became positive after 61 d. The FOM decomposition rate was positively related to PE intensity, and there was a significant difference between coniferous and broadleavecl species in the middle period of the study. More than 77% of the total C lost from FOM was emitted as CO2, indicating that FOM-C serves as an energy resource for soil microbes. The alpha-diversity of the bacterial community at genus-level showed significantly positive correlation with PE at 24 d, and the composition of bacterial community at OTU-level had a marked relationship with the PE between 24-110 d. The relationship between fungal community diversity and composition with PE was only observed at 7 and 110 d, respectively. This study firstly investigated the patterns of PE resulted from numerous FOM input, and the results suggested that soil bacterial community, in particular the Actinobacteria phyla, played a more important role in triggering such PEs than fungal community. (C) 2020 Elsevier B.V. All rights reserved.