论文部分内容阅读
清晰揭示城市绿地的空间布局与景观结构特征对其生态服务功能的影响对指导城市规划设计具有重要参考价值。目前国内外已有较多城市绿地降温增湿及其影响因素的实证研究,但是定量解析绿地群落结构与降温增湿功能关系的研究并不多见。本文基于北京市24个典型绿地群落夏季降温增湿效果的实测,重点解析了绿地郁闭度和绿量对降温增湿功能的影响,并提出了绿地结构优化配置的最优阈值。研究结果表明:北京城市绿地夏季日均降温幅度0.2~2.0℃,日均增湿幅度0.20%~8.26%;不同群落结构绿地降温效果上,乔灌草型>乔草或乔木型>灌草型>草地型;在绿地增湿效果上,乔木型>乔灌草>乔草型>灌草型>草地型;郁闭度和绿量对绿地降温增湿功能均有明显影响,但郁闭度影响更大,冠层郁闭度介于0.60~0.85、三维绿量密度≥5m~3/m~2的乔灌草或乔草型绿地具有最大降温增湿功能。
Clearly revealing the spatial distribution of urban green space and the impact of landscape structural features on its ecological service functions have important reference value for guiding urban planning and design. At present, there are many empirical studies on the temperature and humidity increase of urban green space and its influencing factors both at home and abroad, but there is not much research on the quantitative analysis of the relationship between the structure of green space and the function of cooling and humidifying. Based on the measurement of summer cooling and humidifying effects of 24 typical greenbelt communities in Beijing, this paper focuses on the effects of greenbelt density and greenbelt on the cooling and humidifying functions, and puts forward the optimal threshold for green space structure optimization. The results showed that the daily average temperature drop of urban green space in Beijing was 0.2 ~ 2.0 ℃ and the average daily humidification range was 0.20% ~ 8.26%. On the effect of cooling on the greenbelts in different communities, > Grassland. On the effect of humidification of green land, arbor> arbor> arborvitae> shrub> grassland; canopy density and greening had significant effects on the cooling and humidification of green land, but the degree of canopy density The effects of canopy shrubs or Qiao grass-type greenbelt with maximum canopy temperature and humidity increase ranged from 0.60 to 0.85 and the three-dimensional green density ≥5 m ~ 3 / m ~ 2.