广州部分公园的冷岛效应及影响因子的初步研究

结合植被种类和群落结构调查,对广州四个城市公园绿地的温湿度进行自动监测,每1小时一次,连续监测30天,并采用PCA排序法分析广州市公园的"冷岛"效应与植被、公园面积等因子之间的相关性。结果表明:白天公园气温降低值和相对湿度增加值大小排序一致,黑夜的排序则与之相反。白天的月气温降低与公园面积、水体面积和乔木平均胸径呈正相关;月气温降低与乔木密度呈正相关;月、白天、黑夜相对湿度增加与乔木平均树高、乔木平均胸径、水体面积呈正相关。最终得出结论,广州市的城市公园具有显著的降温增湿效应,且日间降温增湿的幅度大于夜间。

Preliminary Investigation on the Cool-island Effect and Influence Factors of Several Urban Parks, Guangzhou

In order to understand the influences of cool-island effect and irnpactors in urban parks, Tianhe Park, Liuhuahu Park, Diaosuo Park and Zhujiang Park were selected to research in Guangzhou city. Air temperature and relative humidity were monitered automatically every hour a day, and continually 30 days. Meanwhile plant species and vegetable community structure were investigated in every park. Multivariate statistics（PCA analysis） were applied to analyze the relation between cool-i~and effect and impactors. The result showed the air temperature decreased at daytime. So did the relative hunfidity increase value. But the trend showed opposite direction at night. PCA analysis showed daily drop in temperature was positively correlated with park area, water area and trees average diameter. And the total temperature decreasing value was positively correlated with trees density. The increasing relative humidity was positively correlated with tree average height, average dianaeter and water area. At last, urban parks showed significant effect in increasing humidity and decreasing temperature in Guangzhou city, especially in daytime.