Abstract: We examined the spatiotemporal variation and driving factors of net primary productivity (NPP) in Yunnan Province, using trend analysis, correlation analysis, and geodetector method based on NPP data from 2000 to 2015, as well as meteorological, DEM, land use, NDVI and population density data. The interannual variation of NPP in Yunnan Province showed a fluctuating increasing trend with a mean annual growth rate of 2.13 g C·m^-2·a^-1. The average annual NPP had large spatial variations, and generally increased from the northeast to southwest. The NPP in 88.5% of the total areas remained basically unchanged or increased from 2000 to 2015. In terms of each individual factor, the dominant factor for NPP changed from vegetation coverage to precipitation in 2010 and the influence of human interference increased. In terms of two-factor interaction, the interaction of two factors enhanced the explanatory power of spatial differentiation of NPP in Yunnan Province. Therefore, the synergistic effects of multiple factors on NPP should be emphasized in future ecological environment planning to understand the status of ecosystem health in Yunnan Province.

Key words: geodetector, net primary productivity, spatiotemporal variation, MODIS, dominant factor.