Abstract: Net primary productivity (NPP) is a crucial index for evaluating the regional carbon cycle. Understanding the spatiotemporal variation of NPP and its influencing factors has practical significance for formulating scientific and rational sustainable development strategies. In this study, the spatiotemporal variations of NPP in the Xiamen-Zhangzhou-Quanzhou Region during 2001-2020 were examined using correlation analysis, land cover transfer matrix, and contribution analysis in combination with spatial analysis methods based on land cover data, climate data (temperature and precipitation), and NPP products of MODIS platform. The effects of land cover change and climate change on NPP were quantitatively described, and the driving factors of NPP change were analyzed. The results showed that the annual mean NPP in the Xiamen-Zhangzhou-Quanzhou Region fluctuated in the range of 938.1-1100.9 g C·m^-2·a^-1, without obvious decreasing trend in general. Forest land had the highest total NPP value (11117.40 Gg C) and growth rate (103.75 Gg C·a^-1) among all land cover types. The NPP in Xiamen-Zhangzhou-Quanzhou Region was positively correlated with air temperature and negatively correlated with precipitation. The partial correlation between NPP and air temperature was stronger than that between NPP and precipitation. The NPP in most areas of this region was affected by non-climatic factors. In different periods, the dominant factors of NPP change in different land cover types shifted between climate change and land cover change.

Key words: net primary productivity, Xiamen-Zhangzhou-Quanzhou Region, climate change, land cover change, driving factor