基于生态风险路径识别与风险过程干预的矿业城市生态格局优化

矿业开采造成的非点源污染、化学物质迁移等生态风险过程受到景观格局的显著影响,准确识别源汇景观之间生态流所形成的风险路径,是科学干预生态风险、精准实施生态治理的前提.以中国最重要的镁矿基地大石桥市为研究区,在实地样本检测的基础上,考虑地形、土壤、水文等外部条件对镁离子非点源污染过程的影响,在改进的最小累积阻力模型中,引入...

Ecological Pattern Optimization of Mining Cities Based on Ecological Risk Path Identification and Risk Process Intervention

The ecological risk processes such as non-point source pollution and chemical substance migration caused by mining are significantly affected by the landscape pattern. Accurately identifying the risk path formed by the ecological flows between the source and sink landscapes is a scientific intervention in the ecological risk and precise implementation of ecological governance Premise. This article takes Dashiqiao City, the most important magnesium mine base in China, as the research area. Based on field sample testing, considering the impact of terrain, soil, hydrology and other external conditions on the process of magnesium ion non-point source pollution, the minimum cumulative resistance is adopted in the model, influencing factors including terrain humidity, underlying surface CN value, and pollutant concentration are introduced to construct a resistance surface, and the risk path of magnesium ion output risk area and spatial migration is identified. Aiming at the spatial distribution of risk paths, a restoration strategy to strengthen landscape connectivity and reduce risk exposure is proposed, and the structure and composition of land used in dense risk paths are adjusted to construct three areas, two sources, one axis, five belts, and multiple corridors and multiple points. The multi-cluster ecological pattern realizes intervention in the risk process through pattern optimization.