The Ecosystem Vulnerability And Its Measure

The ecosystem environment is the foundation of human's survival and development. The rapid increment of the population and the unreasonable exploitation of resources make ecosystem's coordination ability decend continuously, and the living environment of mankind becomes more and more vulnerable.With the ecosystem environment of our country increasingly worsen, the reseach on regional ecosystem's vulnerability has sprung up. The ecosystem environmental vulnerability is influenced by many factors, which, generally speaking, can be divided into natural factor and human factors. The factors that result in the regional ecosystem environmental vulnerability have inborn natural background. The mankind can use reasonable adjustment and construction to improve the connate alternative vulnerable environment; on the contrary, the unreasonable exploitation or destruction of environment will destroy the originally benign environment and lead to vulnerable ecosystem environment.Therefore, the vulnerability of ecosystem environment is relative, and the absolute stable ecosystem acturally doesn't exist. There is not a wall between the stable ecosystem and the vulnerable one, along with the range and scale of human activity remodelling of nature continuously enlarging, usually the function of the relatively stable ecosystem will be out of balance even degenerate to frail ecosystem.The land consolidation is a stronge disturbance what the mankind exerts on the agroecosystem. Since 2000 the first batch of land consolidation projects start off in our country, the related problems have also comes to studying hot spots. The land consolidation is an important way which effectes the regional ecosystem environment, and the unreasonable engineering measures have some negative influences such as soil character,biodiversify, and ecosystem stability. This article begins with the influences what the land consolidation imparts to the regional ecosystem vulnerability, exploring the measure of ecosystem vulnerability.Through the analysis of the vulnerable factors, we get the factors which effect the regional vulnerability are mainly weather , geography, soil, insects and mankind's activities. In order to eveluate the vulnerable degree of the region, the article introduces the mathematics model to measure the vulnerability, and considers the land consolidation activity can improve the regional ecosystem environment to some extent. This article is divided into five parts.The first part is the introduction. It briefly elaborated the reseach background of the ecosystem vulnerability, the domestic and foreign reseach progress, the reseach significance and the overall thought of this article.The second part is the theoretical reseach part. It mainly discuss the concept of the ecosystem vulnerbility, the cause and type of vulnerable environment, and the eveluation, which make a theoretical foundation for the measure of the regional vulnerability.The third part discusses the influences and eveluation of the regional ecosystem environmental vulnerability from the land consolidation. The land conslidation will make a great influence to the regional environment, the unreasonable method, way and technical measure of land consolidation will change the soil character, reduce the biodiversity, make the stability of the farm ecosystem descend, and cause a so potential bad influence to the farm productivity that make the land degenerate. The article uses comprehensive-index-weighted-sum model to calculate the vulnerable degree of the ecosystem environment before and after the land consolidation.The fourth part is the case shudy. Take the land consolidation project of Xiaoling and Shaping village Chongyang town in Hubei Province as an example, through analysis of the vunerable factors for the studying region, then use the comprehensive-index-weighted-sum model to calculate the degree of ecosystem vulnerbility. The assessment results show that the land consolidation activity can make the regional environmental vulnerable degree lower. What's more, the negative influences of the land consolidation to the regional environment will reduce to the smallest degree through the ecological design of all engineering.The fifth part is the conclusion. It makes a comprehensive summary to the content, and points out the innovation of this article and the further reseach direction.