【摘要】 城市公园对城市热岛的缓解作用广为人知,但是对公园面积和结构如何影响其降温作用却缺乏足够的了解。选择上海市15个公园,研究公园面积和植物群落结构对秋季公园气温和公园冷岛强度的影响,结果表明:秋季城市公园的温度比周边商住区的温度低,公园有明显的冷岛效应,公园的位置影响公园的降温效果,市区公园的气温和冷岛强度与公园面积之间存在显著的定量关系,市区公园的气温随公园面积的增加而增加,冷岛强度则随公园面积增加而降低。公园内不同植物群落类型的降温效果存在差异,其中乔-灌-草类型降温效果最好。更多还原

【Abstract】 The mitigation effect of urban park on urban ’heat island’ is well known,but how the park size and plant community structure affects urban park air temperature is rather unknown.Selecting 15 urban parks in Shanghai as test objects,this paper analyzed the effects of their size and plant community structure on their air temperature in autumn.It was observed that the air temperature in the parks was lower than that in surrounding residential and commercial areas,indicating that the parks had obvious cool island effect.Park location affected the cool island effect,and there existed significant quantitative relationships among the ’cool island’ intensity,air temperature in autumn,and park size.The ’cool island’ intensity was decreased with increasing park size,while the air temperature was increased with increasing park size.Among the plant community structures in the parks investigated,tree-shrub-grass had the best effects on the decrease of the air temperature in autumn in the parks.更多还原