Spatiotemporal differentiation and responses to climate and mining activities of NDVI in Shaanxi Province from 2001 to 2022
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摘要: 陕西省既是我国第一批退耕还林(草)工程试点地区, 又是黄河流域重要的能源供应基地, 近些年在矿产资源开发和生态环境保护修复方面投入巨大。基于MATLAB的趋势分析和相关分析, 该文利用2001—2022年MODIS归一化植被指数(normalized difference vegetation index, NDVI)遥感数据, 研究了植被生态的时空分异规律及其对气候环境与矿业行为双重扰动的响应程度。结果表明: 2001年以来陕西省植被NDVI呈波动上升趋势, 年均增加0.006, NDVI极低值位于2015年; 降水是影响陕西省植被NDVI变化的最主要因子, 在大部分地区NDVI与降水、湿度都表现出显著正相关; 植被NDVI与矿业行为的相关性随着矿(集)区规模越大表现越显著, 在一些能源型城市短期内NDVI呈现先减后增的“V”形趋势, 总体而言矿业行为对陕西省植被NDVI变化的正向贡献大于负向。研究结果将为陕西省生态保护和矿山修复治理提供基础数据和科学参考。Abstract: Shaanxi Province, serving as both one of China’s initial pilot areas for the returning farmland to forestland/grassland project and an important energy supply base in the Yellow River basin, has made substantial investments in mineral resource development and ecological environment protection and restoration in recent years. Based on trend analysis and correlation analysis conducted using MATLAB, this study examined the spatiotemporal differentiation pattern of vegetation ecology and its responses to the dual disturbances of climate conditions and mining activities. The results indicate that from 2001 to 2022, the normalized difference vegetation index (NDVI) of Shaanxi Province exhibited an upward trend while fluctuating, with an average annual increase of 0.006. The lowest NDVI value occurred in 2015. Precipitation acted as the major factor affecting the NDVI of Shaanxi Province. In most areas, NDVI exhibited a significant positive correlation with both precipitation and humidity. The correlation between NDVI and mining activities was increasingly significant with an increase in the mining area. In some energy-based cities, NDVI decreased initially and then increased, exhibiting a V-shaped trend. Overall, mining activity made more positive than negative contributions to changes in NDVI of Shaanxi Province. The results of this study will provide foundational data and a scientific reference for ecological protection and mine restoration and management in Shaanxi Province.
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Key words:
- NDVI /
- spatiotemporal differentiation /
- precipitation /
- mining activity /
- correlation /
- Shaanxi Province
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