| To understand the role of urban forests in the heat island, the heat island effect and its relationships with the pattern of urban forests in Chengdu, Sichuan Province has been analyzed in this paper. The pattern of urban forests in Chengdu was derived from spot and landsat-7 images using GIS. The dynamic model was established based on land use/cover types, metrological data and statistic data of green cover, which has been used for the comprehensive analysis on the relationships between heat island effect and urban forest pattern. The result shows that:(1) The urban forest patches and general Greenland patches with respective shares of the entire landscape of 6.47% and 7.24% in the scope of the study area. It means that the ratio of green space is 13.71%. but lack of the large area urban forest that with habitat in it.(2) The landscape-scale distribution of urban forest is the most uneven in all the types of landscape in Chengdu city. Also it has the most complex borders and the smaller interference by artificial compared to the other three types of landscape.(3) In the study area, chenghua district has the largest total area of the urban forests as well as the average size, but its patche-scale distribution is the most uneven and the dispersion is also the most; the urban forests in jinjiang district has the most complex borders; the urban forests in qingyang district are influenced by the artificial interference less than other districts.(4)the heat distribute more in the northwest of Chengdu than in the southeast, which is on the contrary of the urban forest pattern.(5)The higher the urban green coverage, the more apparent the cooling effect.(6)Under a certain green coverage, a large area of greenbelt has a higher heat reduction than the smaller one.This suggests that at the same time of reasonable planning of the urban forest pattern, it is necessary to appropriately increase the size of urban forest park. |
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