Regional Ecological Security On Landscape Scale

Ecological security is a new research domain, springing up in recent ten-twenty years. High attentions have been paid by many governments and scholars at home and abroad. Ecological security is regarded as foundation stone of national security, and its content of research is one of the main parts in global change at present. It also has been a key problem in sustainable development in China, especially in Western China development. Concerned theories and methods on ecological security still need further development. It is the focus and bottleneck of domestic researches about method, principle, prediction and threshold value of quantificational assessment during studying ecological security.This paper was made up of three parts. The first part summarized research progress on ecological security at home and abroad. The second part, including chapter II, III, IV, was theoretic discussion of ecological security on landscape scale. The third, consisting of chapter V, VI, VII, VIII and IX, was demonstration study of ecological security in Yuyang district using above theory. Based on related researches on ecological security at home and abroad and abundant investigation materials in the field, the study groped for methods, index system and technical means of regional ecological security by using landscape ecology. From theories, firstly, the study discussed basic assessment reference frame of ecological security on landscape scale. Secondly, it put forward the models of ecological risk index and ecological safety index, which could reflect synthetically regional ecological quality and spatial pattern based on ecological process. In assessment principle of ecological security, Landscape ecological assessment can predigests assessment content and calculation process without large numbers of indexes introduced from biology and environment. Thirdly, it probed into threshold value of ecological security on landscape grid scale by using assessment indexes designed in the study. Finally, taking impact of human factors on landscape change and ecological security into consideration, it gave suggestions on regional landscape cultural constructions and ecological restoration. From technical means, the research analyzed method of dynamic simulation on ecological security by using GPS, RS, GIS and GEOCA. It also discussed spatial differences of ecological security within...