掌握闽江流域植被动态变化趋势及其驱动机制可为流域生态环境保护提供参考依据。采用线性趋势分析、偏相关分析和残差分析等方法,分析2000—2020年闽江流域归一化植被指数(NDVI)时空变化特征及其驱动因素的贡献。结果表明:1)2000—2020年闽江流域NDVI呈增加趋势,NDVI平均年际变化率为0.002 1,呈显著增加的区域约占43.54%,主要分布在流域内海拔相对较低的区域,呈显著减少的区域仅占2.3%,主要分布在流域东南部。2)气温和降水整体上能够促进NDVI的增长,但二者存在显著的空间异质性;气温和降水与NDVI呈正相关的区域分别约占总区域的80.17%和73.84%。3)气候变化和人类活动的共同作用是促进流域内NDVI增长的主导因素,对植被NDVI增长的贡献率分别为40%和60%;人类活动贡献率大于60%的区域约占51.93%,在植被管理和修复中,应更加重视人类活动的影响。

Analyzing the trend of vegetation dynamics and its driving mechanism in the Minjiang River Basin can help to provide a reference basis for ecological environmental protection in the basin.Linear trend analysis,partial correlation analysis and residual analysis were used to analyze the spatiotemporal characteristics of the normalized difference vegetation index(NDVI)and the contributions of its driving factors in the Minjiang River Basin from 2000 to 2020.The results showed that:1)NDVI in the Minjiang River Basin showed an increasing trend from 2000 to 2020,with an average interannual rate of change of NDVI of 0.002 1,and the proportion of areas showing a significant increase was about 43.54%,which was mainly distributed in the relatively low elevation areas in the basin,while the proportion of areas showing a significant decrease was only 2.3%,which was mainly distributed in the southeastern part of the basin.2)Air temperature and precipitation can promote the growth of NDVI,but there is obvious spatial heterogeneity between the two;the areas with positive correlation between air temperature and precipitation and NDVI accounted for 80.17% and 73.84% of the total area,respectively.3)Climate change and human activities are the dominant factors to promote the NDVI growth in the basin,contributing 40% and 60% respectively to vegetation improvement.The areas with human activities contributing over 60% accounted for about 51.93%,suggesting that more attention should be paid to the influence of human activities in vegetation management and restoration.