Shrub-encroachment induced alterations in input chemistry and soil microbial community affect topsoil organic carbon in an Inner Mongolian grassland

doi:10.1088/1748-9326/aa5ba6

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	Shrub-encroachment induced alterations in input chemistry and soil microbial community affect topsoil organic carbon in an Inner Mongolian grassland
	Zhou, Luhong 2; Li, He ; Shen, Haihua ; Xu, Yunping 3; Wang, Yinghui 1,4; Xing, Aijun 2; Fang, Jingyun
刊名	BIOGEOCHEMISTRY
	2017
卷号	136 期号:3 页码:311-324
关键词	Biomarkers Coverage gradient Legume shrub Plant-soil feedback Shrub encroachment
ISSN号	0168-2563
DOI	10.1088/1748-9326/aa5ba6
文献子类	Article
英文摘要	Shrub encroachment frequently occurs in arid and semi-arid grasslands worldwide and affects the regional carbon balance. Many previous studies have revealed the effects of shrub encroachment on bulk carbon content of grasslands, but molecular evidence is surprisingly lacking. In this study, we examined the chemical composition of plant tissues and soil organic carbon (SOC), and soil microbial communities to identify the effects of shrub (Caragana microphylla) encroachment on SOC storage in the top layer (0-10 cm) along a gradient of natural shrub cover in the grasslands of Inner Mongolia. We found that SOC in the shrub patches was derived mainly from leaves, whereas SOC in the grassy matrix was composed of a mixture of fresh root- and leaf-derived compounds. Compared with pure grassland, the SOC decreased by 29% in the shrub-encroached grasslands (SEGs), and this decrease was enhanced by increasing shrub cover. We also found that free lipids and lignin-derived phenols increased while the ratios of omega-C-18/aC(18) and suberin/cutin decreased with increasing shrub cover. In addition, the ratios of fungal to bacterial phospholipid fatty acids (PLFAs) and gram-negative to gram-positive bacterial PLFAs decreased with increasing shrub cover. These results indicate that the encroachment of nitrogen-rich legume shrubs can lead to carbon loss by altering the chemical composition of plant inputs as well as the soil microbial community in grassland ecosystems.
学科主题	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
电子版国际标准刊号	1573-515X
出版地	DORDRECHT
WOS关键词	WOODY PLANT ENCROACHMENT ; NORTH-AMERICAN GRASSLANDS ; MATTER ; NITROGEN ; STABILITY ; DYNAMICS ; CUTIN ; DESERTIFICATION ; PERSISTENCE ; MANAGEMENT
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000395741500002
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31330012, 31470525] ; National Basic Research Program of China on Global ChangeNational Basic Research Program of China [2014CB954001] ; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2016M591282]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/22124]
专题	植被与环境变化国家重点实验室
作者单位	1.Peking Univ, Coll Urban & Environm Sci, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China 5.Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Luhong,Li, He,Shen, Haihua,et al. Shrub-encroachment induced alterations in input chemistry and soil microbial community affect topsoil organic carbon in an Inner Mongolian grassland[J]. BIOGEOCHEMISTRY,2017,136(3):311-324.
APA	Zhou, Luhong.,Li, He.,Shen, Haihua.,Xu, Yunping.,Wang, Yinghui.,...&Fang, Jingyun.(2017).Shrub-encroachment induced alterations in input chemistry and soil microbial community affect topsoil organic carbon in an Inner Mongolian grassland.BIOGEOCHEMISTRY,136(3),311-324.
MLA	Zhou, Luhong,et al."Shrub-encroachment induced alterations in input chemistry and soil microbial community affect topsoil organic carbon in an Inner Mongolian grassland".BIOGEOCHEMISTRY 136.3(2017):311-324.