安庆市宜秀区景观生态安全格局构建

Construction of landscape ecological security pattern in Yixiu District of Anqing City

目的:生态安全格局构建是实现区域生态安全、维持区域可持续发展的重要途径,为给安庆市宜秀区生态环境建设提供科学依据和景观生态安全格局优化方法提供参考。方法:采用粒度反推法及Fragstats 4.2软件识别生态源地,采用最小阻力模型构建最小累计阻力面,基于电路理论、ArcGIS水文分析方法等得到“生态廊道”“夹点”“障碍点”。结果:400 m粒度的生态栅格是宜秀区生态源地选取的最适宜尺度。在400 m粒度尺度下,宜秀区生态源地22个,总面积177.16 hm^(2),生态廊道38条,全长56.3 km,“夹点”“障碍点”分别为5、38个。结论:通过对“夹点”的识别、“生态廊道”的提取、“夹点”的保护和“障碍点”的修复,宜秀区的景观生态格局将得到进一步的改善,该研究可为县域尺度下景观生态安全格局构建提供借鉴。

Objective:The optimization of ecological security pattern is an important approach to achieve regional ecological security and maintain regional sustainable development.This paper is to provide a scientific basis for ecological environment construction and a reference for landscape ecological security pattern optimization in Yixiu District of Anqing City.Methods:The Particle Size Regression and Fragstats 4.2 software were used to identify the ecological source,the Minimum Cumulative Resistance(MCR)model was used to construct the minimum cumulative resistance surface,the Circuit theory was used to construct the ecological corridor of Yixiu District,and the"pinch point"and"obstacle point"were identified.Results:The ecological grid of 400 m grain size is the most suitable scale for the selection of ecological sources in Yixiu District.At the grain size of 400 m,there are 22 ecological source a reas with a total area of 177.16 hm^(2),38 ecological corridors with a total length of 56.3 km,5"pinch points"and 38"obstacle points".Conclusion:Through the identification of"pinch points",the extraction of"ecological corridors",the protection of"pinch points"and the restoration of"obstacle points",the landscape ecological pattern of Yixiu district will be further improved.This study can provide reference for promoting ecological network connectivity.