云南省生态保护红线划定对生态安全格局优化的作用

The Role of Delineating Ecological Protection Red Lines in Optimizing Pattern of Ecological Security in Yunnan Province

遴选斑块面积、斑块分离度、斑块聚集度、斑块优势度和景观比例等景观指数,借助Fragstats3.3和ArcGis10.2软件计算分析,对比生态保护红线划定前后云南省景观格局的变化,探讨云南省生态保护红线划定对于云南省生态安全格局的提升和优化效应。结果显示:云南省生态保护红线划定后,作为生态源地的生态红线区域面积和所占景观比例(PLAND)有所增大;最大斑块指数(LPI)和斑块优势度(Do)都有所提升,生态保护源地在整个景观中占优势的程度提高了,从而使其在景观中的支配地位得到了较大提升;表征生态源地的连通性指数斑块分离度(SPLI)、景观形状指数(LSI)数值呈现减小的变化、斑块聚合度(AI)和斑块凝聚度(PCI)则出现增大的变化,连通性指数的计算结果都表明,云南省生态保护红线的划定提高了生态源地内部的连通性,从而增加了生态源地抗干扰的能力。云南省生态保护红线的划定使得景观格局进一步优化,生态安全维护的作用进一步提高。

Class area, splitting index, aggregation index, and percentage of 1 andscape were selected to compare the changes of ecological pattern before and after delineating ecological protection red line with software Fragstats 3. 3 and ArcGis 10. 2 in Yunnan. The results showed that the areas and percentage of landscape of ecological pro-tection red lines increased after ecological protection red lines was delineated. Largest patch index and dominance index also increased, which indicated that ecological source area has become more and more dominant. Splitting in-dex and landscape shape index that represent the connectivity of landscape decreased. On the contrary, aggregation index and cohesion index increased. The results of connectivity index showed that ecological protection red lines raised the connectivity of landscape and promoted the capability of anti - interference. Ecological protection red lines has been optimized the landscape pattern of Yunnan province and improved the ability of maintaining regional ecological security.