Effects of the Different Structures of Green Belts on the Temperature and Humidity in River Corridors

选择北京北五环清河两侧不同结构类型（内部构成、郁闭度）的绿地作为研究对象,利用小尺度定量测定的技术方法,分析城市河流廊道绿地不同内部构成、不同郁闭度与温湿效应的关系,为河流廊道绿带建设提供科学依据。结果显示：1）温湿影响效应大小为乔-灌-草型〉乔-草型〉灌-草型〉草坪。当绿地内部构成为草坪时,降温增湿效应不明显;当绿地内部构成为灌-草型时,其降温增湿效应较明显;当绿地内部构成为乔-草型和乔-灌-草型时,其降温增湿效果明显。2）绿地的降温增湿效果,随着郁闭度的不断增加而逐渐增强。当绿地郁闭度为0.20～0.40时,绿地具有一定的降温增湿效应,但效应不明显;当绿地郁闭度大于0.40时,绿地降温效应明显;当绿地郁闭度超过0.60时,绿地增湿效应极其明显且趋于稳定。 In order to understand scientific basis for constructing green belts in river corridors, the effects of the different structures （internal constitution, canopy closure density） of green belts on the temperature and humidity were analyzed by the smallscale quantitative measurement. In this paper, fourgreen belts with different internal constitutions including treeshrubherbage mixture, treeherbage mixture, shrubherbage mixture and lawn and fivegreen belts with different canopy closure densities including 0 0.20, 0.20 0.40, 0.40 0.60, 0.60 0.80 and 0.80 1.00 along the Qinghe river in Beijing were investigated in July of 2010 . The air temperature and relative humidity in the green bel