干旱区生态环境知识资源中心(Arid): Scrub-vegetation cover impact on soil water migration and temperature change during freeze-thaw events in sandy desert soils of northwest China

Arid

DOI	10.1016/j.catena.2024.107828
	Scrub-vegetation cover impact on soil water migration and temperature change during freeze-thaw events in sandy desert soils of northwest China
	He, Shuai; Zhang, Chengfu; Meng, Fan-Rui; Bourque, Charles P. -A.; Huang, Zhenying; Li, Xiang; Jia, Ruiting
通讯作者	Zhang, CF
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2024
卷号	237
英文摘要	Freeze-thaw events can lead to the upward migration of shallow groundwater in recharging the upper soil profile. However, their effects on soil water movement in areas of deep groundwater is not entirely known, especially in arid and semiarid regions of the world. This study analyzed the soil hydrothermal coupling at two desert sites in the Mu Us Sandy Land (northwest China), noted for their differences in surface scrub-vegetation cover, one with 80 % cover and another with 40 % (sites A and B, respectively). The work consisted of collecting soil temperature and moisture measurements at the two sites, both renowned for their deep watertable. The results showed that the freezing period at both sites was about 3-6 times longer than the thawing period, and that the duration of uniform freezing was inversely related to the degree in surface vegetation cover. During the two freezing periods of 2017-2019, as much as 3.87 (or 21.9 %) and 7.37 mm (42.2 %) of soil water was observed to have migrated upwards from the lower soil layers. Altogether, the total distance traveled by the soil water exceeded 180 cm. Also, about 33.2 (site A) and 22.9 mm of soil water (site B) were depleted because of evaporation in the first 185 cm of the soil complex during the two freeze-thaw events. Extent of vegetation cover, initial soil moisture profile, and soil texture influenced the quantity of water lost from individual soil layers due to evaporation and between soil-layer water exchanges. Soil water migration also affected changes in soil temperature in the range of -12.1 to 4.8 C-degrees within the first 185 cm of the soil complex. Changes in soil temperature were responsible for decelerating freezing and thawing processes, prolonging soil water reallocation processes in the soil. Overall, freeze-thaw events increased the amount of shallow soil water losses due to evaporation, triggering a corresponding decline in soil water in the plant-rooting zone. This drop could conceivably lead to a reduction in sprouting and growth of spring vegetation, further degrading affected sanddominated desertlands. This information may provide insight into the hydrological response of freeze-thaw events in arid regions, as well as provide useful information in guiding afforestation efforts in associated desertlands.
英文关键词	Arid and semiarid regions Freeze -thaw events Sandy lands Soil water migration Soil temperature change
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001169144400001
WOS关键词	ACTIVE LAYER ; MOISTURE ; DYNAMICS ; PERMAFROST ; CYCLES ; STRAW
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403132
推荐引用方式 GB/T 7714	He, Shuai,Zhang, Chengfu,Meng, Fan-Rui,et al. Scrub-vegetation cover impact on soil water migration and temperature change during freeze-thaw events in sandy desert soils of northwest China[J],2024,237.
APA	He, Shuai.,Zhang, Chengfu.,Meng, Fan-Rui.,Bourque, Charles P. -A..,Huang, Zhenying.,...&Jia, Ruiting.(2024).Scrub-vegetation cover impact on soil water migration and temperature change during freeze-thaw events in sandy desert soils of northwest China.CATENA,237.
MLA	He, Shuai,et al."Scrub-vegetation cover impact on soil water migration and temperature change during freeze-thaw events in sandy desert soils of northwest China".CATENA 237(2024).