Soil moisture temporal stability and spatio-temporal variability about a typical subalpine ecosystem in northwestern China

doi:10.1002/hyp.13737

	Soil moisture temporal stability and spatio-temporal variability about a typical subalpine ecosystem in northwestern China
	Zhu, Xi 1; He, Zhibin 1; Du, Jun 1; Chen, Longfei 1; Lin, Pengfei 1; Tian, Quanyan 1,2
刊名	HYDROLOGICAL PROCESSES
	2020-05-30
卷号	34 期号:11 页码:2401-2417
关键词	Qilian Mountains soil moisture spatio-temporal variability temporal stability vegetation types
ISSN号	0885-6087
DOI	10.1002/hyp.13737
通讯作者	He, Zhibin(hzbmail@lzb.ac.cn)
英文摘要	Knowledge of the spatial-temporal variability of soil water content is critical for water management and restoration of vegetation in semi-arid areas. Using the temporal stability method, we investigated soil water relations and spatial-temporal variability of volumetric soil water content (VSWC) in the grassland-shrubland-forest transect at a typical semi-arid subalpine ecosystem in the Qilian Mountains, northwestern China. The VSWC was measured on 48 occasions to a depth of 70 cm at 50 locations along a 240-m transect during the 2016-2017 growing seasons. Results revealed that temporal variability in VSWC in the same soil layer in the three vegetation types and averaged across vegetation types tended to exhibit similar patterns of a decrease with increasing soil depth. Temporal stability in each vegetation type was stronger with an increase in soil depth. However, the results of temporal stability determined with standard deviation of relative difference (SDRD) disagreed with those based on the Spearman's rank correlation coefficient; the forest site had the highest Spearman rank correlation coefficient while the shrubland-the smallest SDRD in the 0-20 cm soil layer. Correlation analyses of VSWCs between two vegetation types indicated that soil water was related among all three vegetation types at the 0-20, and 0-70 cm soil layer, but in the 20-40 and 40-70 cm soil layers, significant correlation (p < .01) occurred only between adjacent vegetation types. In the upper soil layer (0-20 cm), soil water relations were mainly affected by surface runoff. In the lower soil layer (20-40 and 40-70 cm), soil water relations among the three vegetation types were highly complex, and probably resulting from a combination of root distribution and activity, interflow, and the impact of deep soil freeze-thaw dynamics. These results suggest that the factors affecting soil water are complex, and further research should address the relative importance of and interactions among different determining factors.
WOS关键词	SEMIARID LOESS PLATEAU ; HEIHE RIVER-BASIN ; LAND-USE TYPES ; WATER STORAGE ; HYDRAULIC CONDUCTIVITY ; ROBINIA-PSEUDOACACIA ; SPATIAL VARIABILITY ; HILLSLOPE SCALE ; SPRUCE FOREST ; SURFACE
WOS研究方向	Water Resources
语种	英语
出版者	WILEY
WOS记录号	WOS:000533454500008
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/159704]
专题	中国科学院地理科学与资源研究所
通讯作者	He, Zhibin
作者单位	1.Chinese Acad Sci, Linze Inland River Basin Res Stn, Chinese Ecosyst Res Network, Key Lab Ecohydrol Inland River Basin,Northwest In, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Xi,He, Zhibin,Du, Jun,et al. Soil moisture temporal stability and spatio-temporal variability about a typical subalpine ecosystem in northwestern China[J]. HYDROLOGICAL PROCESSES,2020,34(11):2401-2417.
APA	Zhu, Xi,He, Zhibin,Du, Jun,Chen, Longfei,Lin, Pengfei,&Tian, Quanyan.(2020).Soil moisture temporal stability and spatio-temporal variability about a typical subalpine ecosystem in northwestern China.HYDROLOGICAL PROCESSES,34(11),2401-2417.
MLA	Zhu, Xi,et al."Soil moisture temporal stability and spatio-temporal variability about a typical subalpine ecosystem in northwestern China".HYDROLOGICAL PROCESSES 34.11(2020):2401-2417.