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以苏州市紫薇(Lagerstroemia indica L.)、桂花(Osmanthus fragrans(Thunb.)Lour.)、紫叶李(Prunus cerasifera Ehrh.‘Atropurpurea’Jacq.)、日本晚樱(Prunus lannesiana Wils.)和腊梅(Chimonanthus praecox(L.)Link.)等5种常见的群植小乔木为研究对象,研究其对降温增湿效应和对PM2.5的消减效应。结果表明:5种群植小乔木中,紫薇和桂花的降温效应相对明显,日本晚樱和紫薇的增湿效应明显;紫薇对PM2.5消减效应最为明显;5种群植小乔木综合降温增湿效应由大到小依次为:紫薇>日本晚樱>紫叶李>桂花>腊梅。其降温增湿效应与PM2.5消减效应的相关性分析表明,群落内部的降温增湿效应与PM2.5消减效应显著相关;该研究结果为植物配置结构的优化及城市生态环境的改善提供了科学依据及可能的途径。
Lagerstroemia indica L., Osmanthus fragrans (Thunb.) Lour., Prunus cerasifera Ehrh.’Atropurpurea’Jacq., Prunus lannesiana Wils. Chimonanthus praecox (L.) Link.) Were selected as the research object to study their effects on decreasing temperature and increasing humidity and reducing PM2.5. The results showed that the cooling effect of crape myrtle and osmanthus was relatively obvious in five populations of small trees, and the humidification effect was obvious in Japanese cherry and crape myrtle; the effect of crape myrtle on the reduction of PM2.5 was the most obvious; From big to small are as follows: crape myrtle> Japanese night cherry> purple leaf plum> osmanthus> plum. The correlation analysis between the effect of decreasing temperature and increasing humidification and the reducing effect of PM2.5 shows that the effect of decreasing the temperature and increasing the humidity inside the community is significantly related to the reduction effect of PM2.5. The result of this study provides the optimization of plant configuration and the improvement of urban ecological environment Scientific basis and possible ways.