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Xi'an Ecological Security Assessment and Information System Development

Author: GaoMengXu
Tutor: RenZhiYuan
School: Shaanxi Normal University
Course: Cartography and Geographic Information Systems
Keywords: Urban Ecological Security Indicator System Spatial Analysis Secondary development Xi'an
CLC: X826
Type: Master's thesis
Year: 2008
Downloads: 182
Quote: 2
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Abstract

Urbanization is the human socio-economic and cultural development of the product, is the trend of social development and a sign of civilization. However, the rapid development of modern industrial civilization and urbanization continues to accelerate, but also caused a population explosion, environmental pollution and ecological destruction and many other issues, resulting in a large number of urban ecological security issues. The urban ecological security as urban ecosystem sustainability and urban ecological environment an important reflection of their ability to support a comprehensive and objective understanding of the relationship and the mechanism of its intrinsic significance. This paper selected central and western China, Xi'an is one of the mega cities as a research area, first summarize the various existing ecological security evaluation methods, and analyzes and compares the advantages and disadvantages of various evaluation methods, and then combined with the specific circumstances of the study area and the existing The data, technical level, select the appropriate urban ecological security evaluation model, and ultimately build three levels of 26 specific evaluation index system of urban ecological security evaluation, tentatively explored in the study area urban ecological security issues. The main conclusions obtained are as follows: (1) evaluation of ecological security index data through the standardization process and the weights assigned through different raster layer overlay operations, and ultimately get years of urban ecology Xi'an 1991,1996,2001,2005 Security Distribution: in 1991 the value of ecological security between the main range of 40.78-53.16, 41.78-56.02 range mainly between 1996 and 2001, mainly ranged between 46.37-59.51, while in 2005 the value of the main range of ecological safety between 48.74-65.77. From the bottom of ecological safety limit values ??can be seen between 1991 and 2005 the value of the overall ecological safety of Xi'an is rising, but in different regions showed different increases and decreases, and in the same year in the value of ecological safety The distribution also has the obvious regional differences. This article will be divided into the value of urban ecological security insecurity, criticality safety, security and safety of four security levels ideals and produced these four years, Xi'an 1991,1996,2001,2005 ecological security level diagram, more intuitive reflect during the Eighth Five from five to eleven during the past 15 years changes in the ecological security of Xi'an. In addition, the article studies the ecological safety trends were analyzed together, the Wild Goose Pagoda, Baqiao, Weiyang three districts, Yanta District, the value of the best years of ecological safety, Weiyang second, and Baqiao most times. Three districts in the city, the new city was slightly better than Beilin, Lianhu relatively poor. Binding studies of the ecological security evaluation results, articles for Xi'an six city urban ecological security evaluation index were analyzed, combined with the city of Xi'an characteristics and evaluation and analysis of the results, for the process of urbanization in Xi'an demonstrated by the city Ecological safety issues, articles in some cities from home and abroad on the basis of experience, the specific aspects of the proposed six urban ecological construction and ecological protection methods for the relevant departments to carry out ecological safety regulation reference. (2) Ecological Safety Information System Based on the comparative analysis of several major GIS software secondary development of methods based on the analysis of the component GIS development method has the advantage, and ESRI's ArcGIS products ArcObjects development component is introduced. Then in Visual C integrated development environment, combining ArcObjects development components for Xi'an ecological safety information system design and development, and the initial realization of the urban ecological security data query and update the index, the index system settings and ecological security classification and thematic Figure control. As for the urban ecological security research in China is still not formed a complete theoretical system and more mature theoretical approach, but also the safety of existing research on the ecological zone selection mostly Ecotone and extremely fragile ecological areas or concentrated in some of the resources city, this study attempts to innovate in the following areas: (1) Select the large Midwestern cities - Xi'an as a study area for urban ecological security assessment, try to establish a suitable study area features a scientific and reasonable evaluation index system, and Select the key factors evaluated to reflect the urban ecological security situation, in order to enrich the study of urban ecological security type of scenario, and for urban ecological security assessment to provide practical research on the theoretical development of urban ecological security to provide some reference. (2) Using Visual C integrated development environment that combines ArcObjects development component GIS secondary development, trying to establish Xi'an ecological security information system, expanding the geographic information system applications for further analysis of the causes of urban ecological security and Mechanism providing possible. As I levels and data consistency and availability of other reasons, in urban ecological security index system, determining the weights of indicators and data interpolation processing, remote sensing image applications, and part of the system and other aspects of functional modules still exist a certain lack of will in the future research work continuously to explore and improve.

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