干旱区生态环境知识资源中心(Arid): Lateral flow between bald and vegetation patches induces the degradation of alpine meadow in Qinghai-Tibetan Plateau

Arid

DOI	10.1016/j.scitotenv.2020.142338
	Lateral flow between bald and vegetation patches induces the degradation of alpine meadow in Qinghai-Tibetan Plateau
	Jiang, Xiao-Jin; Zhu, Xiai; Yuan, Zi-Qiang; Li, Xiao Gang; Liu, Wenjie; Zakari, Sissou
通讯作者	Liu, WJ ; Zakari, S
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2021
卷号	751
英文摘要	Bald patches (BPs) are known to accelerate and simultaneously mitigate the process of desertification. However, the mechanisms of these two synchronous actions are little studied in high desert and cold systems; and the incidence of BPs on alpine meadows degradation in Qinghai-Tibetan Plateau (QTP) of China is still unavailable. This study first aims to investigate the soil properties and the erodibility of the system BPs-VPs at the Beiluhe basin in QTP. Then, we adopted dye tracer and HYDRUS-2/3D methods to interpret the water infiltration patterns from point scale to slope scale. The results show that the mattic epipedon layer on the top soil (0-20 cm) of VPs directly reduced the impact of raindrops on alpine meadow; and the adhesion of root system in VPs prevented the soil particles from stripping and washing away by runoff. The soil particles in BPs were easily eroded by rainfall, lowering the ground level of BPs relative to the ground level of VPs. The two patches therefore alternated to form an erosion interface where marginal meadow was likely detached by raindrops, and washed away through runoff. The saturated hydraulic conductivity (K-s) of surface soil (0-10 cm) was 124% higher in BPs than the VPs. Thereby, BPs caused a high spatial variation of infiltration and runoff in QTP. Moreover, this difference in K-s between the two patches conducted to a lateral flow from BPs to VPs, and to soil layers with different water contents. These findings highlight that the water flow features can potentially disturb the processes of freezing-thawing, frost heaves, and thaw slump; and accelerate the alpine meadow degradation. Therefore, land cover such as crop and vegetation should be applied over the bare soil surface to prevent the degradation of alpine meadow. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Active layers Lateral flow Saturated hydraulic conductivity Soil erosion Desertification High desert and cold systems
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000587300800140
WOS关键词	SOIL HYDRAULIC-PROPERTIES ; PHYSICAL-PROPERTIES ; ORGANIC-MATTER ; WATER INFILTRATION ; LANDSCAPE FUNCTION ; PREFERENTIAL FLOW ; MACROPORE FLOW ; SOURCE REGION ; EASTERN CAPE ; YELLOW-RIVER
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327976
作者单位	[Jiang, Xiao-Jin; Zhu, Xiai; Liu, Wenjie; Zakari, Sissou] Chinese Acad Sci, Xishuangbanna Trop Bot Garden, CAS Key Lab Trop Forest Ecol, Menglun 666303, Yunnan, Peoples R China; [Jiang, Xiao-Jin; Zhu, Xiai; Liu, Wenjie; Zakari, Sissou] Chinese Acad Sci, Core Bot Gardens, Ctr Plant Ecol, Menglun 666303, Yunnan, Peoples R China; [Yuan, Zi-Qiang] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China; [Li, Xiao Gang] Lanzhou Univ, Sch Life Sci, Inst Arid Agroecol, State Key Lab Grassland & Agroecosyst, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Xiao-Jin,Zhu, Xiai,Yuan, Zi-Qiang,et al. Lateral flow between bald and vegetation patches induces the degradation of alpine meadow in Qinghai-Tibetan Plateau[J]. 兰州大学,2021,751.
APA	Jiang, Xiao-Jin,Zhu, Xiai,Yuan, Zi-Qiang,Li, Xiao Gang,Liu, Wenjie,&Zakari, Sissou.(2021).Lateral flow between bald and vegetation patches induces the degradation of alpine meadow in Qinghai-Tibetan Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,751.
MLA	Jiang, Xiao-Jin,et al."Lateral flow between bald and vegetation patches induces the degradation of alpine meadow in Qinghai-Tibetan Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 751(2021).