Chongqing City Park Plant Communities Visitors Comfort Discussion

Parks is an important part of the urban ecosystem. Park's ecological benefits have directly effect on the city public space environment. Some research on the park's ecological benefits have been carried out at home and abroad. Besides some scholars have made a new understanding of eco-efficiency.Ecological benefit on the park have been researched at abroad from a early beginning, a high degree of quantitative study have been completed. The study on ecological benefits of green spaces relatively is started later relatively. Domestic scholars mainly focuse on qualitative studies and the study is a little one-sidedness. It does not yet have a complete systematic.In this paper, the main of the study is the Chongqing city parks. The main of the park's major community types, community structure, species composition, temperature and humidity effects, etc; and also the relationship between all of this and human comfort.In July 2009 September, May to August 2010, taked Chongqing Beibei Park, Bijin Park, Huahui Park, Eling Park and Zhaomushan Park, Hongensi Park as object respectively. The issues listed above are kernel-based system in the parks. The paper proves the following:①The common plant communities of Chongqing are the following:evergreen broad-leaf forests, the mixed stand of conifer and broad-leaved forests, pure forest, savanna, shrub, grass or lawn. The plant communities of Chongqing City Parks more than 80% is subtropical forest, also the plant landscaping and plant species selection are both simulated natural plant communities.②All the types of plant communities have very significant effects to improve human comfort, but the improvement effect is not entirely consistent. The same crown density between mixed and pure forests there was no significant difference in temperature and humidity effects. Evergreen broad-leaf forests and the mixed stand of conifer and broad-leaved forests are significant differences in effecting of temperature and humidity to the pure forest, and its effect of improving the human comfort is a little better.③Ginkgo as a foreign deciduous broad-leaved species is not as effective as other species of evergreen broad-leaved and the native trees in terms of the improvement human comfort; osmanthus as a ornamental tree is not equal to other species in improve human comfort.④Crown density effects on human comfort exists in a variety of the plant community. The larger the plant crown density,the greater the effects on human comfort will be.⑤The effect of human comfort is not a straight line with the increase of crown density.The turning point is that the crown density increases to a certain extent- 60% to 70%.Before the point the effectiveness of comfort with the crown density increases linearly with the rising trend, after which the crown with increasing degree of comfort to improve the effect of human growth decreases.⑥It is basically the same that high-type trees improve human comfort effect, small trees in improving the human comfort is better than high-type and are significant differences to the high-type trees.⑦The opened and closed plot of the mixed stand of conifer and broad-leaved forests which the crown density are same is similar to the comfort.⑧The greater of the plant community extinction ratio, the stronger the effect of temperature and humidity comfort is higher which show a positive correlation between them.⑨When the extinction ratio is below 50%, the effect of human comfort fluctuates within an interval.while the number of the extinction ratio reach to50%-80%, the effect significantly improves in improving the human comfort. It is the highest level of human comfort.when the extinction ratio reaches to90%.