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	Tracking Ecosystem Water Use Efficiency of Cropland by Exclusive Use of MODIS EVI Data
	Tang X. G.; Li, H. P.; Griffis, T. J.; Xu, X. B.; Ding, Z.; Liu, G. H.
	2015
关键词	water use efficiency cropland MODIS vegetation index GPP ET gross primary production enhanced vegetation index time-series data primary productivity carbon-dioxide stomatal conductance remote estimation climate-change terrestrial evapotranspiration grassland ecosystems
英文摘要	One of the most important linkages that couple terrestrial carbon and water cycles is ecosystem water use efficiency (WUE), which is relevant to the reasonable utilization of water resources and farming practices. Eddy covariance techniques provide an opportunity to monitor the variability in WUE and can be integrated with Moderate Resolution Imaging Spectroradiometer (MODIS) observations. Scaling up in situ observations from flux tower sites to large areas remains challenging and few studies have been reported on direct estimation of WUE from remotely-sensed data. This study examined the main environmental factors driving the variability in WUE of corn/soybean croplands, and revealed the prominent role of solar radiation and temperature. Time-series of MODIS-derived enhanced vegetation indices (EVI), which are proxies for the plant responses to environmental controls, were also strongly correlated with ecosystem WUE, thereby implying great potential for remote quantification. Further, both performance of the indirect MODIS-derived WUE from gross primary productivity (GPP) and evapotranspiration (ET), and the direct estimates by exclusive use of MODIS EVI data were evaluated using tower-based measurements. The results showed that ecosystem WUE were overpredicted at the beginning and ending of crop-growth periods and severely underestimated during the peak periods by the indirect estimates from MODIS products, which was mainly attributed to the error source from MODIS GPP. However, a simple empirical model that is solely based on MODIS EVI data performed rather well to capture the seasonal variations in WUE, especially for the growing periods of croplands. Independent validation at different sites indicates the method has potential for broad application.
出处	Remote Sensing
卷	7
期	9
页	11016-11035
收录类别	SCI
语种	英语
ISSN号	2072-4292
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/38873]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Tang X. G.,Li, H. P.,Griffis, T. J.,et al. Tracking Ecosystem Water Use Efficiency of Cropland by Exclusive Use of MODIS EVI Data. 2015.

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