干旱区生态环境知识资源中心(Arid): The effect of desertification on frozen soil on the Qinghai-Tibet plateau

Arid

DOI	10.1016/j.scitotenv.2019.134640
	The effect of desertification on frozen soil on the Qinghai-Tibet plateau
	Wang, Luyang 1,2; Wu, Qingbai 1; Jiang, Guanli 1
通讯作者	Wu, Qingbai
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2020
卷号	711
英文摘要	Under the influences of climate change and human activities, desertification has become widespread on the Qinghai-Tibet Plateau (QTP). However, the effect of desertification on frozen soil is still debated. Here, soil temperatures are observed through 14 boreholes at Honglianghe River Basin on the QTP to study the relationship between desertification and frozen soil. The results showed soil temperatures change with the thickness of sand cover. With increasing sand thickness, maximum soil temperatures at shallow depths (0.05-6.00 m) increase by 0.25-1.57 degrees C, but minimum temperatures decrease by 0.21-1.49 degrees C, on average. Temperatures at deep depth (>= 6.00 m) exhibit a rising trend that temperatures increase by 0.01-0.05 degrees C on average with each increment of 10 cm in sand thickness. Furthermore, aeolian sand enhances seasonal thawing processes, resulting in an increase of 7.70-9.50 cm in active layer thickness with each increment of 10 cm in sand thickness. Meanwhile, aeolian sand weakens seasonal freezing processes, resulting in a decrease of 1.07-13.00 cm in seasonal freezing depth with each increment of 10 cm in sand thickness. Moisture contents of aeolian sand and vegetation coverages on the sand cover surface influence energy state and thermal regime of frozen soil. Annual heat budgets of soil under aeolian sand increase from -57.97 MJ m (2) to -26.28 MJ m (2) as water content of sand layer decreases from 13.42% to 3.61%. Annual range of ground temperatures of soil at shallow depths (0.05-1.60 m) increase by 2.19-6.17 degrees C on average as vegetation coverage increases from 5% to 20%. Due to the effects of aeolian sand on frozen soil, desertification accelerates, and can even cause, the degradation of frozen soil on the QTP. Our study provides an important reference for future research about the interaction between desertification and frozen soil in other regions. (C) 2019 Elsevier B.V. All rights reserved.
英文关键词	Aeolian sand Permafrost Seasonally frozen ground Thermal regime of soil Qinghai-Tibet Plateau
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000509344700127
WOS关键词	PERMAFROST
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315519
作者单位	1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang, Luyang,Wu, Qingbai,Jiang, Guanli. The effect of desertification on frozen soil on the Qinghai-Tibet plateau[J],2020,711.
APA	Wang, Luyang,Wu, Qingbai,&Jiang, Guanli.(2020).The effect of desertification on frozen soil on the Qinghai-Tibet plateau.SCIENCE OF THE TOTAL ENVIRONMENT,711.
MLA	Wang, Luyang,et al."The effect of desertification on frozen soil on the Qinghai-Tibet plateau".SCIENCE OF THE TOTAL ENVIRONMENT 711(2020).