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	Changes of soil properties regulate the soil organic carbon loss with grassland degradation on the Qinghai-Tibet Plateau
	Peng Fei1,2,3; Xue Xian1,4; You Quangang1; Huang Cuihua1; Dong Siyang1; Liao Jie1; Duan Hanchen1; Tsunekawa, Atsushi2,3; Wang Tao1
刊名	ECOLOGICAL INDICATORS
	2018-10-01
卷号	93页码:572-580
关键词	Landdegradation Qinghai-Tibet plateau Soil organic carbon Structural equation modeling Desertification
ISSN号	1470-160X
DOI	10.1016/j.ecolind.2018.05.047
通讯作者	Peng Fei(pengfei@lzb.ac.cn) ; Xue Xian(xianxue@lzb.ac.cn)
英文摘要	Grassland in the Qinghai-Tibet Plateau (QTP) provides tremendous carbon (C) sinks and is the important ground for grazing. Grassland degradation, the loss of plant coverage and the emergence of sand activities, results in substantial reduction in soil organic carbon (SOC). To demonstrate the pattern of SOC loss and to elucidate underlying mechanisms, vegetation, soil microclimate, soil properties and respiration of grasslands with different degradation severity over the QTP were investigated. The survey and laboratory data were analyzed by three structural equation modeling (SEM) analyses, which based on three conceptual understandings. The black box model (M1) directly related the abiotic and biotic factors to SOC without consideration of any mechanisms. The biological understanding model (M2) developed the structure of SEM mainly considering ecological processes that regulate the soil SOC. The overall model (M3) developed the SEM structure with the inclusion of both physical and biological processes. Soil moisture (theta), the above and the below-ground plant productivity, and SOC significantly decreased while soil temperature (T-soil) maintained with the development of land degradation. All the three models successfully fitted the data with R-2 about 0.50. Significant pathways from latent variables to SOC were only observed from soil microclimate and soil properties in the Ml. In the M2, three mechanisms can explain the SOC change. The decrease in theta and the consequent adverse effect on soil respiration suggest suppressed C output through microbial decomposition, thus lead to the less SOC loss. The decline in aboveground net primary productivity (ANPP) resulted from a decrease in coverage or due to the change in relative abundance of sedge, forbs, and grass directly or indirectly reduced the C input, and finally lead to the 40-50% loss in SOC. In the M3, only the change in soil properties can explain the SOC reduction. Our results suggest that changes in soil abiotic factors like soil bulk density and pH are the primary factors control the SOC change with land degradation.
收录类别	SCI
WOS关键词	LAND DEGRADATION ; PLANT DIVERSITY ; SEMIARID STEPPE ; WATER EROSION ; ALPINE REGION ; DESERTIFICATION ; NITROGEN ; IMPACT ; PERMAFROST ; QUALITY
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Environmental Sciences
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000452692600058
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558217
专题	寒区旱区环境与工程研究所
通讯作者	Peng Fei; Xue Xian
作者单位	1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou, Gansu, Peoples R China 2.Tottori Univ, Int Platform Dryland Res & Educ, Tottori, Japan 3.Tottori Univ, Arid Land Res Ctr, Tottori, Japan 4.Univ Oklahoma, Dept Microbial & Plant, Norman, OK 73019 USA
推荐引用方式 GB/T 7714	Peng Fei,Xue Xian,You Quangang,et al. Changes of soil properties regulate the soil organic carbon loss with grassland degradation on the Qinghai-Tibet Plateau[J]. ECOLOGICAL INDICATORS,2018,93:572-580.
APA	Peng Fei.,Xue Xian.,You Quangang.,Huang Cuihua.,Dong Siyang.,...&Wang Tao.(2018).Changes of soil properties regulate the soil organic carbon loss with grassland degradation on the Qinghai-Tibet Plateau.ECOLOGICAL INDICATORS,93,572-580.
MLA	Peng Fei,et al."Changes of soil properties regulate the soil organic carbon loss with grassland degradation on the Qinghai-Tibet Plateau".ECOLOGICAL INDICATORS 93(2018):572-580.

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