中文摘要：

为定量化分析西北地区不同树种在城市局部微气候中降温增湿的特征差异,提出基于高分辨率遥感影像、与实地采样数据相结合的方法进行不同树种对局部地区微气候的影响评估及其价值估算。以西安市为研究样区,以白杨、法桐、国槐、油松4等种树种为分析对象进行研究,结果表明,4种绿化树种均具有良好的降温增湿效应,且植被覆盖度越高,降温增湿效果越显著;不同树种的降温增湿效果有较为明显的差异,具体表现是不同树种降温效应由大到小依次为白杨〉法桐〉国槐〉油松;不同树种增湿效应由大到小依次为白杨〉法桐〉国槐〉油松;不同树种的降温增湿效应都具有明显的影响范围,且随着树种斑块的大小而动态变化。

英文摘要：

In order to quantitatively analyze the cooling and humidifying characteristics of different tree species in the local micro climate of the city,in northwest region,a method is put forward combining high resolution remote sensing image with field sampling data,to evaluate the influence of different tree species on the local micro climate and its value estimation. Taking Xi＇an as example,choosing four representative tree species,such as poplar,platane,sophora japonica,and pinus tabulaeformis for research material,the results showed：four types of greening tree species all have good cooling and humidifying effect,what＇ s more,the higher the vegetation coverage,the cooling humidification effect is more significant; the cooling and humidifying effect of different tree species has obvious differences,the rank for different tree species of decreasing air temperature is poplar 〉platane〉 sophora japonica 〉pinus tabulaeformis,in addition,the effect of increasing air relative humidity is in order of poplar〉 platane 〉sophora japonica〉 pinus tabulaeformis; the cooling and humidifying effect of different tree species has obvious influence range,There for,it changes dynamically with the tree plaques size.