基于优度评价法的西藏土地利用生态安全评价研究

Assessment on the Eco-security of Land Use in Tibet Based on the Superiority Evaluation Method

研究目的:构建区域土地利用生态安全评价指标体系,定量评价西藏7个地(市)的土地利用生态安全状况。研究方法:优度评价法,可拓理论。研究结果:西藏土地利用生态安全的总体程度不高,所有地(市)表现出基本安全或不安全状态;土地利用生态安全状况存在明显的空间分异,"一江两河"中部地区最好,藏北和藏西北地区最差,其他地区居中。研究结论:优度评价法能较好地应用于区域土地利用的生态安全评价。

The purpose of this paper is to establish an indexes system for the assessment on the eco-security of regional land use, and then quantitatively assess the eco-security situation of land use in seven prefectures and cities in Tibet. The research methods include the superiority evaluation method and the extension theory. The results show that the overall eco-security level of land use in Tibet is not high and all the prefectures and cities show only the degrees of basic safe or unsafe. There is an obvious spatial differentiation in the eco-security of land use in Tibet, amongst which, the middle region, i.e., the so-called ＂one river and two streams＂ is ranked the best, while the north and northwest regions are ranked the worst, and other parts are ranked at the middle level. The research conclusions are that the superiority evaluation method can be well applied to the assessment on the eco-security of regional land-use.