干旱区生态环境知识资源中心(Arid): Evapotranspiration, gross primary productivity and water use efficiency over a high-density olive orchard using ground and satellite based data

Arid

DOI	10.1016/j.agwat.2023.108423
	Evapotranspiration, gross primary productivity and water use efficiency over a high-density olive orchard using ground and satellite based data
	Elfarkh, Jamal; Johansen, Kasper; El Hajj, Marcel M.; Almashharawi, Samir K.; McCabe, Matthew F.
通讯作者	Elfarkh, J
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2023
卷号	287
英文摘要	The trade-off between increasing agricultural production and groundwater conservation, which is often the only irrigation source in arid regions, is a major challenge for water managers, decision-makers and the scientific community. Monitoring of the water use efficiency (WUE) provides a measure of the water lost from a canopy to the atmosphere relative to the biomass produced by the plants, and can be used to inform efforts that seek to reduce irrigation without impacting upon the yield. In this study, WUE was computed as the ratio between the gross primary productivity (GPP) and the evapotranspiration (ET). Both GPP and ET can be measured at the local scale using eddy covariance (EC) systems. However, in order to spatially evaluate WUE for larger areas or regions, local measurements are rarely representative. The spatiotemporal covariation of ET, GPP and WUE remains understudied, particularly at the scale of operational agroecosystems. In this study, Sentinel-2 optical bands were used to provide high spatiotemporal resolution estimates of ET via application of the Priestley-Taylor Jet Propulsion Laboratory (PT-JPL) model. A key soil water stress constraint in PT-JPL was linked to the Modified Soil-Adjusted Vegetation Index (MSAVI), while estimates of the GPP were delivered via the Vegetation Photosynthesis Model (VPM). In order to evaluate the water consumption and irrigation efficiency over an irrigated plantation of very high-density olive trees, ET, GPP and WUE were computed for a 1.5 year period, covering January 2019 to June 2021. Model estimates of both ET and GPP were compared to the EC measurements, with results providing a root mean square error (RMSE) of 63.3 W/m2 and a coefficient of determination (R2) of 0.74 for ET and 2.3 g C/m2/day and 0.73 for GPP, respectively. Based on these estimates, WUE was then calculated as the ratio of the GPP and ET. Relative to in situ measured data, the results were biased, with ET overestimated and GPP underestimated. An alternative measure for WUE was determined based on a linear regression model of meteorological data derived from ERA5-Land and vegetation indices derived from Sentinel-2 data. Overall, the best results were identified using an NDVI-based linear regression model, with an RMSE of 0.9 g C/Kg H2O and an R2 of 0.76. These results show the potential of high-resolution satellite data to assess WUE over agroecosystems, helping to overcome the limitations presented by in-situ measurements and supporting agricultural production and water resources management in water-limited regions.
英文关键词	Water use efficiency Evapotranspiration Gross primary productivity Sentinel-2 Olive orchard
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001029925500001
WOS关键词	NET ECOSYSTEM EXCHANGE ; INFRARED DROUGHT INDEX ; SAVANNA WOODLAND ; FLUX MEASUREMENT ; EVAPORATION ; TOWER ; MODEL ; CARBON ; MAIZE ; ASSIMILATION
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395083
推荐引用方式 GB/T 7714	Elfarkh, Jamal,Johansen, Kasper,El Hajj, Marcel M.,et al. Evapotranspiration, gross primary productivity and water use efficiency over a high-density olive orchard using ground and satellite based data[J],2023,287.
APA	Elfarkh, Jamal,Johansen, Kasper,El Hajj, Marcel M.,Almashharawi, Samir K.,&McCabe, Matthew F..(2023).Evapotranspiration, gross primary productivity and water use efficiency over a high-density olive orchard using ground and satellite based data.AGRICULTURAL WATER MANAGEMENT,287.
MLA	Elfarkh, Jamal,et al."Evapotranspiration, gross primary productivity and water use efficiency over a high-density olive orchard using ground and satellite based data".AGRICULTURAL WATER MANAGEMENT 287(2023).