城市蒸发散量与相关生态要素的定量关系

以福州城区为例，使用2003，2013年的Landsat卫星影像获得了研究区蒸发散量、建筑用地和植被信息，查明了研究区蒸发散量的时空变化特征，并对上述参数之间的相关关系进行了定量分析.研究结果表明，福州研究区2013年的区域蒸发散量比2003年有较大幅度的降低，其降幅达30.62%.回归分析表明，蒸发散量与建筑用地呈很强的线性负相关关系，而与植被则呈明显的线性正相关关系.显然福州城市的扩展、建筑用地的增加和植被的减少是导致研究区ET降低的最重要原因.
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