矿山生态修复对祁连山自然保护区植被覆盖度影响分析

    Analysis of the impact of mining ecological restoration on vegetation coverage in Qilian Mountain Nature Reserve

    • 摘要: 矿产资源的开发促进了经济社会的发展,但同时对生态环境影响很大。十八大以来,我国实施了一系列生态保护工程,加强矿山生态修复与治理。植被是连接土壤、大气和水分等土地覆盖要素的自然“纽带”,以定性和定量的方式分析矿区植被生态演变特征及其影响因素,可及时掌握矿区植被恢复发展状况,对典型矿区生态恢复、有效治理具有重要意义。本文基于多尺度卫星影像、土地覆被数据、气温和降水等数据资料,利用像元二分模型反演植被覆盖度、趋势分析法、相关性分析法等,对甘肃祁连山国家级自然保护区及保护区内矿山开采区在生态修复前后的植被覆盖度时序变化特征进行分析,并对植被覆盖度变化的影响因素进行探讨。研究结果显示:近十年来,保护区植被覆盖度总体呈现波动变化趋势,并且在2017年前后呈现不同空间格局。2017年之前,保护区西北部植被覆盖度受降水影响呈现改善趋势,而中部和东南部植被覆盖度受矿山开发、过度放牧等人类活动影响呈现退化趋势。2017年之后,保护区中部和西北部植被覆盖度受2020年以后暖干气候的影响呈现退化趋势,而东南部植被覆盖度因生态修复治理呈现改善趋势。保护区内矿山开采区植被覆盖度在2017年之后因生态修复得到明显改善,植被覆盖度整体提升27.3%,改善区域面积占55.92%,其中武威段内矿山开采区植被覆盖度改善程度较其他区域显著。研究发现,保护区内植被覆盖度变化明显的区域在空间分布上和植被覆盖度与降水量、气温相关性较大区域基本一致,表明在大尺度上植被覆盖度变化更多地受气候因素的影响。矿山开采区植被覆盖度在2017年之前持续退化,2017年之后明显改善,表明人类活动对局部区域植被覆盖度变化的影响。

       

      Abstract: The development of mineral resources has promoted economic and social development, but at the same time, it has a significant impact on the ecological environment. Since the 18th National Congress of the Communist Party of China, China has implemented a series of ecological protection projects to strengthen the ecological restoration and governance of mines. Vegetation is a natural “link” connecting land cover elements such as soil, atmosphere, and water. Qualitative and quantitative analysis of the ecological evolution characteristics and influencing factors of vegetation in mining areas can timely grasp the development status of vegetation restoration in mining areas, which is of great significance for the ecological restoration and effective management of typical mining areas. This paper is based on multi-scale satellite images, land-cover data, temperature and precipitation data, and uses the dimidiate pixel model to retrieve fractional vegetation coverage, trend analysis, correlation analysis, etc., to analyze the temporal changes in vegetation coverage before and after ecological restoration in the Qilian Mountains National Nature Reserve and mining areas within the reserve, and to explore the influencing factors of vegetation coverage changes. The research results show that in the past decade, the vegetation coverage of protected areas has shown an overall fluctuating trend, and different spatial patterns were observed before and after 2017. Before 2017, vegetation coverage in the northwest showed an improvement trend due to precipitation, while vegetation coverage in the central and southeastern regions showed a degradation trend due to human activities such as mining development and overgrazing. After 2017, the vegetation coverage in the central and northwestern parts of the protected area showed a degradation trend due to the impact of warm and dry climate after 2020, while the vegetation coverage in the southeastern part showed an improvement trend due to ecological restoration and management. The vegetation coverage in the mining areas within the protected area has significantly improved after 2017 due to ecological restoration, with an overall increase of 27.3% in vegetation coverage and an improvement area of 55.92%. Among them, the vegetation coverage in the mining areas within the Wuwei section has improved significantly compared to other areas. Research has found that the areas with significant changes in vegetation coverage within the protected area are basically consistent in spatial distribution with areas with high correlation between vegetation coverage and precipitation and temperature, indicating that vegetation coverage changes are more influenced by climate factors on a large scale. The vegetation coverage in mining areas continued to deteriorate before 2017, but showed a significant improvement trend after 2017, indicating the impact of human activities on changes in local vegetation coverage.

       

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