The Study Of Health Assessment And Regulation Technique Of Urban Forest System In Xiamen City

Along with the accelerated process of urbanization, the human living environment deteriorate sharply, the intensification of air pollution levels, heat island effect, loss of biological diversity, etc., which not only threat people's health, but also restricted the city's sustainable development. Urban forest ecosystem as a new type of forest ecosystem, it plays an important role in regulating climate, improving the environment, conserving water, preventing soil and water losses, protecting biological diversity and ecosystem stability, etc., and also have a certain extent effect in physical and mental health for people. Therefore, the health of urban forest ecosystem will be directly related to the global ecological security and sustainable development of human society. So, it has a very important social significance in carrying out the analysis and evaluation of urban forest health. In this paper, it make a reasonable assessment for the status of urban forest in Xiamen, and put forward practical measures for the regulation technology, the contents and outcomes of the study are as follows:(1).This study consists of structural indicators, function indicators, landscape indicators and efficiency indicators, and selects a total of 19 indicators to construct the assessment index system for urban forest health of Xiamen, and develop a health evaluation criteria.(2).Through the analysis of indicators of health evaluation, using a method named AHP as a combination of qualitative and quantitative to determine the weight of evaluation index, and calculate the synthetical evaluation index number for every index.(3).According to the calculation results of composite index, this text conducts a comprehensive evaluation to the health of forest health for Xiamen. The results show that the comprehensive evaluation index of urban forest ecosystem in Xiamen is 0.6476, the condition of the health is gradeâ…¢,more close to gradeâ…¡, that is from subhealth towards health; the evaluation index of efficiency indicators is the highest for 0.7357,the health rank is gradeâ…¡,belong to health; the evaluation index of structural indicators is 0.7929, although the health rank is gradeâ…¡, in a healthy state, but it is more close to gradeâ…¢,it shows that in recent years, the accelerated development of urbanization in China have made the structural integrity of urban forest ecosystem, which has been destroyed by people, so as to the subhealth; the evaluation index of function index is 0.6714, the health rank is gradeâ…¢, belong to subhealth, more close to gradeâ…¡;the lowest evaluation index is landscape indicators for 0.5784, compeletely in the subhealth state.From the indicators of 19 layers, most of their health between gradeâ…¡and gradeâ…¢,as between subhealth and health, but the changing magnitude of the evaluation index values is large relatively, the lowest of the evaluation index is human values for 0.4000, the health rank is gradeâ…£,belong to unhealthy; the diversity of landscape is 0.5000,the ornamental effect of greenbelt and the function of water conservation is 0.5714,at the edge of subhealth, shows that, along with the expansion of city size, the improvement of various equipments and the increase of population, cultural landscape, natural landscape and the arts landscape has not reached a very good combination, but also the effects and function of greenbelt are not fully played out, the quality of people's life is not high, which restrict the healthy and sustainable development of urban forest.(4).According to the results of health assessment of urban forest ecosystem in Xiamen, this article offer some reasonable and effective control measures from the quantity, quality and management:In terms of quantity: increase the percentage of greenery coverage of Xiamen city reasonably; protect the biological diversity and constitute the multiple community structure including arbor, shrub and grass;In terms of quality: Strengthening the transformation of ecological forest; optimize the ecological patterns of landscape;In terms of management: enlarge the propaganda dynamics and establish the public participation system of urban forest; apply the high and new technology, establish a highly efficient management system; give priority to ecology, process scientific planning; strengthening the training of personnel, attach importance to the scientific research of urban forest cultivation; make the management of urban forest into the legal track and improve the agency management system.