摘要
以西安兴庆宫公园典型落叶乔灌木和常绿乔灌木人工群落为对象,分别对其内部不同位置的6、7月中旬的叶面积指数、温湿度及光环境进行了观测。结果表明:林内与对照地的温湿度差随着距林缘距离的增加而增大,但等距离差值(梯度值)逐渐减少,其中气温梯度值减少较明显。遮光率随着叶面指数(LAT)的增大或冠层高度的降低而增加,冠层低而且叶面积指数较大的灌木或小乔木的遮光率最高;绿地规模是降温增湿的基础,而LAI是决定温湿效应强弱的关键。
Based on a deciduous tree-shrub （P1） and an evergreen tree-shrub （P2） in Xingqinggong Park in Xi＇ an, the leaf area index（LAI）, air temperature（T）, relative humidity（RH） and illumination（I） were observed at different sites of two plots in middle June and middle July. The results showed that the difference of temperature and relative humidity （△T,△RH） increased along with the increase of the distance to forest edge （DFE）, and the difference at the same distance （the gradient of △T or △RH） declined and the gradient of △T was more significant. Along with the increase of LAI or the devrease of canopy height,the shading rate declined,and the shrub or small arbor with lower canopy and higher LAI had higher shading rate. The scale of urban green is the basis and the condition of LAI is the key to the temperature reduction and humidification.
出处
《西北林学院学报》
CSCD
北大核心
2008年第3期57-61,共5页
Journal of Northwest Forestry University
基金
国家林业科技支撑计划“生态经济型防护林体系空间配置与结构设计技术研究”(2006BAD03A0205)
关键词
城市绿地
降温增湿
林内光环境
结构规模
urban greenland
temperature reduction and humidification
luminous environment in forestry
structure and scale
