Relationship between surface net radiation and landcover pattern in an urban area

摘要

This research retrieved surface net radiation using meteorological data and Landsat 5 TM images of the four seasons in the year 2009. Meanwhile the 65 different landscape metrics of each analysis unit were acquired using landscape analysis method. Then the most effective landscape metrics which could affect surface net radiation were determined by correlation analysis, stepwise regression, etc. The results showed that the spatial composition of land cover pattern has significant effect on surface net radiation. The proportions of bare land and forest land are effective and important factors which affect the changes of surface net radiation all the year round. But the spatial allocation of land cover pattern has no significant influence on surface net radiation. Moreover, the proportion of forest land is more capable of explaining surface net radiation than the proportion of bare land. This study is helpful in exploring the formation and evolution mechanism of urban heat island. It also gives theoretical hints and realistic guidance for urban planning and sustainable development.