【摘要】 以定西市渭源县为研究区,探究在县域单元尺度下,脆弱生态环境保护格局构建方法 .从研究区实际出发,选择生物多样性维护、水源涵养和水土保持等生态系统服务功能和水土流失敏感性进行评价,得到生态源地.基于最小累积阻力模型等,识别安全组分.对生态安全格局结果进行优化,用连接度分析方法保障整体景观的连通性,降低景观破碎化.结果表明,生态源地面积为338.07km~2,占据全县国土面积的16.37%,实验划定的生态源地基本覆盖自然资源部门划定的生态红线,两者分布情况基本相符.生态廊道长度为151.61 km,生态战略节点数量为58个,缓冲区显示的生态安全水平分布情况与生态环境现状基本一致,一定程度上验证了方法的可靠性.更多还原

【Abstract】 Taking Weiyuan County of Dingxi City as a research area, we explored the construction of a fragile ecological environment protection pattern at the county scale. Based on the actual situation of the study area, the ecosystem service functions, such as biodiversity maintenance, water and soil conservation and the sensitivity of water and soil loss, were selected for evaluation, and the ecological source area was obtained. Safety components were identified based on the minimum cumulative resistance model and other knowledge. The results of ecological security pattern were optimized, and the connectivity analysis method was used to ensure the connectivity of the overall landscape and reduce landscape fragmentation.The ecological source area obtained was 338.07 km~2, accounting for 16.37% of the county’s land area.The ecological source area determined by the experiment basically covered the ecological red line determined by the natural resources department, and their distribution was basically consistent. The length of the ecological corridor was 151.61 km and the number of ecological strategic nodes 58. The distribution of the ecological security level shown in the buffer zone was basically consistent with the status quo of the ecological environment, thus verifying the reliability of the method to a certain extent.更多还原