County Scale Ecological Security Pattern Construction Based on MCR Model

Abstract

[Objective] An ecological security pattern with regional characteristics was constructed in order to provide a scientific reference for the protection of the ecological environment and the construction and zoning management of ecological security patterns at the county level. [Methods] Referring to the Guide for Delimitation of Ecological Protection Red Lines, we selected four indicators for quantitative evaluation of ecology at Yongchun County in Fujian Province: soil and water conservation, water conservation, biodiversity protection, and forestry protection. The minimum cumulative resistance (MCR) model and the gravity model were used to build the wildlife corridor, evaluate the importance of the corridor by grades, extract ecological nodes, and construct the ecological security pattern of Yongchun County. [Results] A total of 11 ecological source areas were identified in Yongchun County, with a total area of 64.8 km2, accounting for 4.45% of the total area. Fifty-five ecological corridors and 27 ecological nodes were constructed, including 25 important corridors and 30 secondary corridors that were concentrated in the central and eastern regions with a reticular distribution. [Conclusion] According to the results of ecological source identification and corridor division, an ecological security pattern framework for Yongchun County was constructed, with source as the core, corridor as the network, and ecological nodes as the focus. The interaction intensities between ecological source areas were obviously different. The distribution densities of source areas and the stability of the wildlife corridor in the central region were greater than in the western region, and should be regarded as key protection areas.

Keywords

• mcr model
• ecological source
• gravity model
• ecological security pattern
• yongchun county, fujian province