Spatiotemporal Variations of Evapotranspiration and Its Quantitative Relationship with Other Ecosystem Components in Urban Areas

Abstract:

This paper, taking Fuzhou urban area as an example studied the urban ET variations and its relationship with urban buildup land and vegetation using two Landsat images of 2003 and 2013. The result reveals that the ET has been sharply decreased by 30.62% in urban areas. The regression analysis shows that ET has a strong negative linear correlation with urban buildup land and an obvious positive linear correlation with vegetation. Apparently, urban expansion, buildup land increase and vegetation reduction are the key factors contributing to the decreasing of ET in urban areas.