Responses of bacterial communities and their carbon dynamics to subsoil exposure on the Loess Plateau

doi:10.1016/j.scitotenv.2020.144146

	Responses of bacterial communities and their carbon dynamics to subsoil exposure on the Loess Plateau
	Sun, Qiqi 1,2,3; Guo, Shengli 1,2; Wang, Rui 1,2; Song, Jinming3
	2021-02-20
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
卷号	756 页码:12
通讯作者	Wang, Rui(ruiwang0212@126.com) ; Song, Jinming(jmsong@qdio.ac.cn)
摘要	Subsoil exposure due to factors including erosion and terracing, evidently decreases soil organic carbon storage and productivity, but the responses of bacterial communities and their carbon dynamics remain unclear. Soils from 0-20 cm, 20-60 cm and 60-100 cm were collected from three 100 cm profiles in bare land on the Loess Plateau. and incubated in buried pots for a year (July 2016 to July 2017) to simulate subsoil exposure, with ongoing monitoring of the microbial mineralization rate of soil organic carbon (K-c), using Li-Cor 8100. At the end of the incubation period, the exposed soil and the in situ control soil were sampled to investigate changes in bacterial community composition, as represented by 16S rRNA, and the activities of enzymes involved in soil carbon cycling. Both copiotrophic (Actinobacteria and Alphaproteobacteria) and oligotrophic (Thermoleophilia) groups were stimulated in the exposed vs. control soil at 20-60 and 60-100 cm. The exposed vs. control soil from 60 to 100 cm produced the greatest bacterial responses, such as greater diversity and altered keystone groups (Thermoleophilia vs. unidentified Acidobacteria). Enzyme activities were greater in the exposed vs. control soil at both 20-60 cm (beta-D-xylosidase and cellobiohydrolase) and 60-100 an (beta-D-xylosidase and beta-D-glucosidase). The exposed soil from 20-60 cm and 60-100 cm had lower K-c and Q(10) values than those at 0-20 cm. Our findings revealed the existence of bacterial depth-specific responses to subsoil exposure, and highlight the effect of anthropogenic soil redistribution on soil carbon flux and its potential responses to future climate change. (C) 2020 Elsevier B.V. All rights reserved.
关键词	Subsoil exposure Bacterial community composition Enzyme activity Carbon mineralization rate Temperature sensitivity
DOI	10.1016/j.scitotenv.2020.144146
收录类别	SCI
语种	英语
资助项目	Natural Science Foundation of China[41371279] ; Natural Science Foundation of China[41301322] ; China Postdoctoral Science Foundation[2018M643755] ; Chinese Universities Scientific Fund[2014YB055]
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000603487500144
出版者	ELSEVIER
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/169884
专题	海洋生态与环境科学重点实验室
通讯作者	Wang, Rui; Song, Jinming
作者单位	1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Shandong, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Sun, Qiqi,Guo, Shengli,Wang, Rui,et al. Responses of bacterial communities and their carbon dynamics to subsoil exposure on the Loess Plateau[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,756:12.
APA	Sun, Qiqi,Guo, Shengli,Wang, Rui,&Song, Jinming.(2021).Responses of bacterial communities and their carbon dynamics to subsoil exposure on the Loess Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,756,12.
MLA	Sun, Qiqi,et al."Responses of bacterial communities and their carbon dynamics to subsoil exposure on the Loess Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 756(2021):12.

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