干旱区生态环境知识资源中心(Arid): Analysis of the spatio-temporal variability of soil water dynamics in an arid catchment in South Africa

Arid

DOI	10.1016/j.geodrs.2021.e00395
	Analysis of the spatio-temporal variability of soil water dynamics in an arid catchment in South Africa
	Mengistu, Achamyeleh G.; Woyessa, Yali E.; van Rensburg, Leon D.; Tesfuhuney, Weldemichael A.
通讯作者	Mengistu, AG (corresponding author), Univ Free State, Dept Soil Crop & Climate Sci, Bloemfontein, South Africa.
来源期刊	GEODERMA REGIONAL
ISSN	2352-0094
出版年	2021
卷号	25
英文摘要	The accurate quantification of soil water dynamics is critical as it is a key parameter in the soil-plant-atmosphere continuum. This study was conducted to analyse the spatio-temporal variability of soil water dynamics in dry areas. The Soil and Water Assessment Tool (SWAT) was used to estimate the dynamics of soil water balance. The model was calibrated and validated by the regionalization with physical similarity approach. Unlike the revap water (water drawn upwards from shallow groundwater tables), the soil water, percolation and lateral flow increased with precipitation. The Mann Kendall trend test also shows that there was no trend in both the annual and monthly soil water content (SWC) and percolation; however, there was a decreasing trend (1.091 mm per annum) in the revap water. The contribution of the revap water to evapotranspiration (ET) varied from 9% during summer to 32% during spring. The SWC also exhibited a higher spatial variation. Larger part of the catchment recorded a long-term annual mean soil water content varying between 0.1 and 0.2 mm mm(-1). The soil water anomaly (SWA) consistently follows the trends of dry and wet seasons in the study area. Although the use of model-derived drought monitoring indices are relevant for farmers and decision makers in arid areas, it requires intensive verification over much larger scales to increase the reliability of model results. (C) 2021 Elsevier B.V. All rights reserved.
英文关键词	Arid catchments Multiple soil classes Soil water dynamics Soil water anomaly South Africa Spatio-temporal variation Trend analysis
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000654040700003
WOS关键词	SPATIAL-DISTRIBUTION ; MOISTURE ; GROUNDWATER ; TRANSPIRATION ; CALIBRATION ; PARAMETERS ; INTENSITY ; DROUGHT ; SURFACE ; TRENDS
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350388
作者单位	[Mengistu, Achamyeleh G.; Tesfuhuney, Weldemichael A.] Univ Free State, Dept Soil Crop & Climate Sci, Bloemfontein, South Africa; [Woyessa, Yali E.] Cent Univ Technol, Dept Civil Engn, Bloemfontein, South Africa; [van Rensburg, Leon D.] Vans Lab Soil Plant & Water Anal, Bloemfontein, South Africa
推荐引用方式 GB/T 7714	Mengistu, Achamyeleh G.,Woyessa, Yali E.,van Rensburg, Leon D.,et al. Analysis of the spatio-temporal variability of soil water dynamics in an arid catchment in South Africa[J],2021,25.
APA	Mengistu, Achamyeleh G.,Woyessa, Yali E.,van Rensburg, Leon D.,&Tesfuhuney, Weldemichael A..(2021).Analysis of the spatio-temporal variability of soil water dynamics in an arid catchment in South Africa.GEODERMA REGIONAL,25.
MLA	Mengistu, Achamyeleh G.,et al."Analysis of the spatio-temporal variability of soil water dynamics in an arid catchment in South Africa".GEODERMA REGIONAL 25(2021).