| According to the Daxing desertification characteristics of the environment, study is made to establish ecological security evaluation index system and construction principle, to divide groups of coefficient by adopting quantity principle and method, to identify coefficient weight by using related degree analysis, and to put forward security coefficient and calculating method to measure ecological security.The factors, which affect ecological security, are soil, moisture, vegetation and wind force.Indexes put forwards to evaluate ecological safety according to magisterial factors and replaceable regular such as organic matter of soil, percentage of plant coverage, rainfall and propottion of sticky-sand.Based on these, the effectiveness of every factor is calculated, and the ecological safety coefficient of the every land-using plot in Daxing County is worked out, and the ecological safe appraisement picture about Daxing County is painted by GIS technique.This research technique can serve as a reference for regional ecological safety evaluation. |