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Spatiotemporal variation and driving factor of vegetation coverage from 2000 to 2020 in southern Jiangxi Province,China

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Author:: No author available

Journal Title:: Chinese Journal of Applied Ecology

Issue:: 11

DOI:: 10.13287/j.1001-9332.202311.023

Key Word:: 归一化植被指数;地理探测器;自然因素;人为因素;赣南;normalized difference vegetation index;geographic detector;natural factor;human factor;southern Jiangxi Province

Abstract：植被在水、碳循环和能量流动中起着重要作用,是调节陆地碳平衡和反映气候变化、人类活动的重要指标.本研究采用Mann-Kendall检验、Theil-Sen Median分析、Hurst指数和变异系数等方法分析2000-2020年赣南生长季植被归一化植被指数(NDVI)的时空变化,用地理探测器综合分析气候、地形、土壤和人为因子等对植被NDVI空间分异的影响.结果表明:2000-2020年,植被NDVI以0.003·a-1的速率波动上升.高等级和中高等级植被NDVI面积占比分别为55.8％和41.9％,低波动变化和较低波动变化的区域面积占比为92.3％.植被NDVI极显著改善和显著改善面积占比分别为40.4％、19.4％,极显著退化和显著退化面积总占比仅为2.2％,持续改善和未来改善面积占比分别为28.0％和60.2％.高程、降水量、相对湿度、温度、地貌类型、土地利用类型、人口密度和夜间灯光指数为研究区植被NDVI的主要影响因子,其次是坡度、土壤类型和GDP,坡向和植被类型为间接影响因子.研究期间,赣南植被NDVI整体上稳定性较好,未来植被变化趋势以改善为主,人为因子中土地利用类型、人口密度和夜间灯光指数对植被NDVI的影响整体呈上升趋势.

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