Anhui is one of the agricultural provinces in China.Its food security is directly influenced by the dynamics of the local ecosystems,which can be reflected through the change in vegetation net primary productivity (NPP).This study used MOD17A3 NPP data,meteorological data,and land use type data to investigate the spatio-temporal changes to vegetation NPP and its driving factors in Anhui Province from 2000 to 2015.The data was analyzed using bias analysis,coefficient of variation,trend analysis,and correlation analysis.The results showed that 1) Between 2000 and 2015,the average annual NPP for Anhui Province was 476.6 gC/m2,ranging from 396.6 to 531.8 gC/m2,and vegetation NPP had a strong spatial variability in Anhui Province,where it was higher in the south and lower in the northern part of the Province.2) The average NPP varied for different land cover where forest land had the largest NPP at 535.5 gC/m2.The amplitude of the NPP annual change also varied for different land cover,with the largest values being recorded for forest and grassland.3)Vegetation NPP changes were driven by many environmental factor,such as climate change and human activities,but rainfall played the most important role.However,the large increases in human activities and urbanization have meant that they have gradually become the main forces driving NPP change.%安徽省是我国的农业大省,其生态系统的动态变化直接关系粮食安全.植被NPP的变化可以有效反映生态系统的变化.基于MOD17A3 NPP数据、气象数据和土地利用类型数据,采用偏差分析法、变异系数、趋势分析法和相关分析法对安徽省2000-2015年植被NPP的时空格局、变化趋势及驱动因子进行研究.结果表明:(1)2000-2015年安徽省植被NPP平均值为476.6gC/m2;波动范围为396.6-531.8gC/m2;植被NPP具有较强的空间分异性,整体上呈现南高北低趋势;(2)不同土地覆盖类型的年均NPP差异明显,其中林地最高,为535.5gC/m2,而且不同地类的NPP年际变化幅度不同,主要表现在林地和草地的变化幅度相对较大;(3)植被NPP受气候、环境变化以及人类活动等多种因素共同影响,其中受气候因素中降雨影响较大,但是随着人类活动日益频繁,城市化逐渐成为NPP变化的主要驱动力.
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