[Construction of Ecological Security Pattern in Guizhou Province based on Multi-scenario Ecosystem Services...

Constructing an ecological security pattern balances ecological environmental protection with high-quality economic and social development. In this study， Guizhou Province is taken as the research area， and four ecosystem services functions-water production， soil conservation， habitat quality， and carbon sequestration-are evaluated. The optimal scenario identifies the priority protection area， representing the ecological source area， based on an ordered weighted average model. Ecological corridors are extracted using circuit theory to construct the ecological security pattern. The results show that： ① By setting and comparing the trade-off degree and protection efficiency under seven risk scenarios， the most optimal scenario was scenario 3， which had a low risk coefficient （α=0.5） and a relatively balanced background of the four ecosystem services. In this scenario， the protection efficiency of the four ecosystem services improved to varying degrees. ② The total area of ecological source areas was 29 688.72 km²， accounting for 16.85% of the total area of the study region， and its spatial distribution showed a pattern of concentration around the borders of the province and sparsity in the central area. ③ The total number of ecological corridors was 876， with a total length of 37 637.16 km， showing a "web-like" distribution， dense in the southeast and sparse in the northwest. ④ The eastern and southeastern parts of Guizhou were identified as ecologically important areas， the central part was an ecological control area， and the western part was an ecological improvement area. Additionally， a regional ecological development pattern of "three zones and two belts" was proposed， which includes major ecological corridors and ecological corridor restoration belts， providing scientific support for constructing and zoning the ecological security pattern of Guizhou.