Study On Green Quantity And Structure Effect Of Plant Communities Of Green-Land In Shanghai

At present, with the development of China's urbanization process, the urban ecological environment is becoming worse. In order to improve the urban ecological environment, the research of green-land and green quantity is been given more attention. In this research, we used plant community as object to study the connection between factor measurement of trees and green quantity, scoring by experts and information collection to determine the landscape evaluation index systems and evaluate the typical plant communities, CITY green model to evaluate the ecological benefits and set the relationship between green quantity and Ecological benefits. The work could provide scientific reference not only for the correlate research of green quantity, but also for plant configuration in shanghai. The main conclusions are as follows:(1) Accurately describe the concept of green quantity and the indicators of green quantity, increase the crown surface area in the green quantity indicator systems. Crown surface area can visualize the expression of green quantity, which established the basis for green quantity research.(2) By studying the correlation of factor measurement of trees and green quantity of the four different green-land types plant communities, we found parks and subsidiary greenbelt smaller due to manual pruning. Defend greenbelt because of its isolation, protection of the functional requirements and relatively bigger density, the green quantity is larger. The result showed that Stratified communities occupied a largest proportion, Single community occupied the smallest.(3) In all communities surveyed, we found that the human factors on the impact to Green quantity of Communities have the following characteristics:when DBH and height is smaller, more obvious man-made affect on the green quantity. With age increasing, some grow taller with bigger green quantity. In the same canopy density circumstances, the correlation of crown diameter and density is clear, when the density is small, the crown diameter is larger and more volatile, as the density increasing, the crown diameter is smaller and smaller fluctuation, The reason is that with the density increasing, the competition of plants in light, heat and water will be stronger. The neighborhood effect is becoming stronger, so the crown diameter is relatively small. (4) In the study of common garden plants, we found that the relationgship between green quantity and DBH Height were positive correlation. With the height of Ligustrum lucidum increasing, the green quantity has largest extent. At the same time, the green quantity of Ginkgo biloba is increased first, then decreased.(5) In the study of correlation between green quantity and landscape benefits in the model plant communities, not green quantity is larger, the effect of landscape is better, The effect of plants landscape is closely related to the color, health status, structural changes and other factors. The author proposed a new evaluation indicators and evaluation methods, Blur AHP analysis of plant communities, which can be more accurate.(6) In the study of the correlation between green quantity and ecological benefits, we used citygreen model to evaluate the ecological benefits of the park. The relationship between green quantity and ecological benefits were positive correlated. The green quantity of YangPu park was1.09×106m3, carbon storage was 833t, Carbon sequestration was 19t, air pollution removal was 1086.37kg, stormwater control was 2040.81m3.The green quantity of GongQing forest park was1.13×107m3, carbon storage was 7077t, Carbon sequestration was 159t, air pollution removal was 9237.11kg, stormwater control was 14090.69m3.