| The 13 familiar shrub species in Changsha city were chosen as research object. It has tested the transpiration rate of the shrub species and research on the temperature decrease and humidity increase effect of the species. The results showed that: the same shrub species of temperature decrease and humidity amount exhibited that 7 species were larger in June and 5 species larger in August and only one species larger in October. Different shrub species of temperaturedecrease and humidity increase amount in the same month exhibited that the strongest species in April is Ligustrum quihoui Carr and the strongest species in June, August and October are Cercis chinensis Bunge. Verage annual temperature decreasing and humidity increasing amounts per leaf area of shrub species sort is: Cercis chinensis Bunge跃Photinia serrulata＞Ligustrum quihoui Carr＞Pittosporum tobira＞H. Syriacus＞Pyracantha fortuneana＞Lorpetalum chinense var rubrum＞Punica granatum＞Rhododendron simsii＞Chimonanthus praecox＞Camellia japomica＞Euonymus japonicus跃Osmanthus fragrans var. Semperflorens. Using cluster analysis, a comprehensive evaluation is made to give a ranking list. Among shrub species, Photinia serrulata, Ligustrumquihoui Carr, Cercis chinensis Bunge get the best of temperature decrease and humidity increase effect, while Pittosporum tobira, H. Syriacus, Pyracantha fortuneana, Lorpetalum chinense var. rubrum, Punica granatum, get a medium of it, and Euonymus japonicus, Camellia japomica, Osmanthus fragrans var. Semperflorens get minimum of it. |
