城市蒸发散量与相关生态要素的定量关系

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

摘要:

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.

关键词:遥感; 蒸发散量; 基于指数的建筑用地指数（IBI）

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.

Key words:remote sensing; evapotranspiration; indexbased buildup index(IBI)