干旱区生态环境知识资源中心(Arid): Mechanisms of dust emissions from lakes during different drying stages in a semi-arid grassland in northern China

Arid

DOI	10.3389/fenvs.2022.1110679
	Mechanisms of dust emissions from lakes during different drying stages in a semi-arid grassland in northern China
	Qi, Shuai; Ren, Xiaomeng; Dang, Xiaohong; Meng, Zhongju
通讯作者	Meng, ZJ
来源期刊	FRONTIERS IN ENVIRONMENTAL SCIENCE
EISSN	2296-665X
出版年	2023
卷号	10
英文摘要	Semi-arid playas are important to grassland ecosystem species as an important source of global dust emissions. However, there is a lack of data on dust emissions during the different drying stages of grassland playas. In this study, we initially conducted the field experiments on two types of surfaces (intermittently dried and permanently dried) in playas located in semi-arid regions in northern China, and we measured dust emissions at five wind speeds in spring when wind erosion was frequent. The results showed that the intermittently dried surface was more prone to wind erosion, which was primarily due to the formation of a loose and fragile salt crust on the surface. In addition, the proportion of salt in the dust was higher than that for the permanently dried surfaces. Nevertheless, the total horizontal dust flux (1.13-2.3 g/cm(2).min) from the intermittently dried surface was only 5%-15% that of the permanently dried surface (7.47-42.86 g/cm(2).min). The dust content varied linearly with the height of the intermittently dried surface, and varied exponentially with the height of the permanently dried surface. The particles collected on the intermittently dried surface were larger (< 63 mu m) than those collected on the permanently dried surface (< 10 mu m), and the unit mass concentration of each ion (mainly Na+, Cl-, and SO4 (2-)) in the salt dust was also higher for the intermittently dried surface than for the permanently dried surface. Although salt dust was continuously released from the intermittently dried surface, the total amount released each time was limited. These results indicate that to attenuate the damage of salt dust storms, priority should be given to protecting permanently dried surfaces and reducing the supply of salt dust particles at the surface.
英文关键词	grassland playa wind erosion salt crust salt dust desertification of land
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000918270100001
WOS关键词	AEOLIAN DUST ; WIND EROSION ; SAND SALTATION ; WEST TEXAS ; NEW-MEXICO ; PLAYA ; TRANSPORT ; DYNAMICS ; SURFACE ; DESERT
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/2XILL650/396507
推荐引用方式 GB/T 7714	Qi, Shuai,Ren, Xiaomeng,Dang, Xiaohong,et al. Mechanisms of dust emissions from lakes during different drying stages in a semi-arid grassland in northern China[J],2023,10.
APA	Qi, Shuai,Ren, Xiaomeng,Dang, Xiaohong,&Meng, Zhongju.(2023).Mechanisms of dust emissions from lakes during different drying stages in a semi-arid grassland in northern China.FRONTIERS IN ENVIRONMENTAL SCIENCE,10.
MLA	Qi, Shuai,et al."Mechanisms of dust emissions from lakes during different drying stages in a semi-arid grassland in northern China".FRONTIERS IN ENVIRONMENTAL SCIENCE 10(2023).