Permafrost and land cover as controlling factors for light fraction organic matter on the southern Qinghai-Tibetan plateau

doi:10.1016/j.scitotenv.2017.09.052

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	Permafrost and land cover as controlling factors for light fraction organic matter on the southern Qinghai-Tibetan plateau
	Wu, Xiaodong 2; Zhao, Lin 2; Hu, Guojie 2; Liu, Guimin 3; Li, Wangping 1; Ding, Yongjian 2,4
刊名	Science of the Total Environment
	2018-02-01
卷号	613-614 页码:1165-1174
关键词	Biogeochemistry Electric control equipment Electric frequency control Gas emissions Global warming Greenhouse gases Organic carbon Soil moisture Textures C:N ratio Light fraction organic matters Microbial decomposition Permafrost degradation Qinghai-Tibetan plateau Soil organic carbon Soil textures Total nitrogen
ISSN号	00489697
DOI	10.1016/j.scitotenv.2017.09.052
英文摘要	Permafrost degradation can stimulate the decomposition of organic soil matter and cause a large amount of greenhouse gas emissions into the atmosphere. The light fraction organic matter (LFOM) is a labile substrate for microbial decomposition and probably plays an important role in future permafrost carbon cycles. However, little is known about the distribution of LFOM and its relationship with permafrost and environmental factors. Here, we investigated the light fraction carbon (LFC) and nitrogen (LFN) contents and stocks under meadows and wet meadows with different permafrost conditions on the southern Qinghai-Tibetan Plateau. Our results showed that LFC and LFN were mainly distributed in the upper 30 cm of soils, and the sites with permafrost had significantly higher contents of LFC and LFN than those from the sites without existing permafrost. The LFC and LFN decreased sharply with depth, suggesting that the soil organic matter (SOM) in this area was highly decomposed in deep soils. Soil moisture and bulk density explained approximately 50% of the variances in LFC and LFN for all the sampling sites, while soil moisture explained approximately 30% of the variance in permafrost sites. Both the C:N ratios and LFC:LFN ratios in the sites with permafrost were higher than those in the sites without permafrost. The results suggested that the permafrost and land cover types are the main factors controlling LFOM content and stock, and that permafrost degradation would lead to a decrease of LFOM and soil C:N ratios, thus accelerating the decomposition of SOM. © 2017 Elsevier B.V.
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	Elsevier B.V., Netherlands
WOS记录号	WOS:000414160500117
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150213]
专题	土木工程学院
作者单位	1.School of Civil Engineering, Lanzhou University of Technology, 287 Langongping Road, Lanzhou; 730050, China; 2.Cryosphere Research Station on the Qinghai-Tibetan Plateau, State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 320 West Donggang Road, Lanzhou; 730000, China; 3.School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, 88 West Anning Road, Lanzhou; 730070, China; 4.University of Chinese Academy of Sciences, Beijing, 19(A) Yuquan Road, Beijing; Shijingshan District; 100049, China
推荐引用方式 GB/T 7714	Wu, Xiaodong,Zhao, Lin,Hu, Guojie,et al. Permafrost and land cover as controlling factors for light fraction organic matter on the southern Qinghai-Tibetan plateau[J]. Science of the Total Environment,2018,613-614:1165-1174.
APA	Wu, Xiaodong,Zhao, Lin,Hu, Guojie,Liu, Guimin,Li, Wangping,&Ding, Yongjian.(2018).Permafrost and land cover as controlling factors for light fraction organic matter on the southern Qinghai-Tibetan plateau.Science of the Total Environment,613-614,1165-1174.
MLA	Wu, Xiaodong,et al."Permafrost and land cover as controlling factors for light fraction organic matter on the southern Qinghai-Tibetan plateau".Science of the Total Environment 613-614(2018):1165-1174.