首都圈多伦地区荒漠化生态安全评价

Evaluation of Ecological Security in Duolun County

以多伦地区为例,提出了荒漠化地区生态安全评价的具体指标体系和构建原则,并采用数量化原理与方法,对各指标进行了具体量级划分,利用关联度分析方法,确定了指标的系数,并提出了衡量生态安全程度的数量化指标、生态安全系数及其计算方法。以土壤养分、植被状况、水分条件和地表抗蚀性4个影响生态安全的因子确定了指标体系。以土壤有机质含量、植被盖度、降水量和土壤黏粒为生态安全评价的具体指标,计算了各个因子对生态安全的影响程度。根据土地利用情况,确定了多伦215个土地利用单元的生态安全系数,采用GIS平台得到了多伦地区的生态安全评价图。研究成果可直接为环北京防沙治沙重点工程的实施提供具体指导,研究方法可供区域生态安全评价借鉴。

The evaluation of ecological security is an important part of evaluation for territory resources, it is an important base of synthetic management and utilization and macro control. By studying ecological brittle situation of desertification region which is based Duolun county, results show the ecological security evaluation index system and construct principle , divide groups of coefficient by adopting quantity principle and method, definite coefficient weight by using related degree analysis, and put forward security coefficient and calculated method to measure ecological security. The factors affecting ecological security are soil nutrient, vegetation, moisture and the ground erodibility. The study put forwards indexes to evaluate ecological safety according to magisterial factors and replaceable regular such as organic matter of soil, percentage of plant coverage, rainfall and clayey content. Based on these, the effectiveness of each factor is calculated, and the ecological safety coefficient of the every land-using plot in Duolun County is worked out, and the ecological safe appraisement picture about Duolun County is painted by CIS technique. This research technique can be used for reference in regional ecological safety evaluation.