干旱区生态环境知识资源中心(Arid): Estimating evapotranspiration in semi-arid rangelands: connecting reference to actual evapotranspiration and the role of soil evaporation

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DOI	10.2989/10220119.2018.1505779
	Estimating evapotranspiration in semi-arid rangelands: connecting reference to actual evapotranspiration and the role of soil evaporation
	Gwate, Onalenna 1; Mantel, Sukhmani K.1; Finca, Andiswa 2; Gibson, Lesley A.3; Munch, Zahn 4; Palmer, Anthony R.1,2
通讯作者	Gwate, Onalenna
来源期刊	AFRICAN JOURNAL OF RANGE & FORAGE SCIENCE
ISSN	1022-0119
EISSN	1727-9380
出版年	2019
卷号	36 期号:1 页码:17-25
英文摘要	In a context of water scarcity, efforts to increase landscape production should focus on improving water productivity. This requires an appreciation of the various components of evapotranspiration (ET), including soil evaporation (E-s) because the latter reflects 'unproductive' water loss. Both complex and simple algorithms have been developed to determine ET. In data scarce areas, developing and testing parsimonious algorithms is useful. This study sought to improve a simple single layer ET model by incorporating an E-s component. Empirical methods were also explored to predict ET from vegetation indices (VIs), leaf area index (LAI) and reference evapotranspiration (ET0). A large aperture scintillometer and an eddy covariance (EC) system were used to validate the proposed algorithm at three sites over Grasslands and Albany Thicket biomes in the Eastern Cape, South Africa. There was good agreement between the observed and predicted ET with RMSE of 0.30-0.58 mm d(-1) when average daily observed ET was 0.43-3.24 mm. The VIs had moderate correlations with the observed data due to the significant role played by E-s (65%-84%) across the sites and stomatal conductance at the Albany Thicket site. The simple algorithms developed would make determining ET easier in data scarce regions.
英文关键词	Grassland leaf area index Thicket vegetation indices
类型	Article
语种	英语
国家	South Africa ; Scotland
收录类别	SCI-E
WOS记录号	WOS:000461370900003
WOS关键词	GLOBAL TERRESTRIAL EVAPOTRANSPIRATION ; VEGETATION INDEXES ; MODIS LAI ; PRODUCTS ; VALIDATION ; RIPARIAN ; US
WOS类目	Ecology ; 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/2XILL650/213924
作者单位	1.Rhodes Univ, Inst Water Res, Grahamstown, South Africa; 2.Anim Prod Inst, Agr Res Council, Grahamstown, South Africa; 3.Univ Edinburgh, Sch Engn, Edinburgh EH9 3JL, Midlothian, Scotland; 4.Stellenbosch Univ, Dept Geog & Environm Studies, Stellenbosch, South Africa
推荐引用方式 GB/T 7714	Gwate, Onalenna,Mantel, Sukhmani K.,Finca, Andiswa,et al. Estimating evapotranspiration in semi-arid rangelands: connecting reference to actual evapotranspiration and the role of soil evaporation[J],2019,36(1):17-25.
APA	Gwate, Onalenna,Mantel, Sukhmani K.,Finca, Andiswa,Gibson, Lesley A.,Munch, Zahn,&Palmer, Anthony R..(2019).Estimating evapotranspiration in semi-arid rangelands: connecting reference to actual evapotranspiration and the role of soil evaporation.AFRICAN JOURNAL OF RANGE & FORAGE SCIENCE,36(1),17-25.
MLA	Gwate, Onalenna,et al."Estimating evapotranspiration in semi-arid rangelands: connecting reference to actual evapotranspiration and the role of soil evaporation".AFRICAN JOURNAL OF RANGE & FORAGE SCIENCE 36.1(2019):17-25.