Abstract: Net primary productivity (NPP) of vegetation in the Fenhe River Basin from 2000 to 2015 was estimated by the CASA model. Trend analysis and correlation analysis were used for exploring the driving factors and different gradients of NPP. The results showed that the NPP of vegetation showed a fluctuating upward trend, with a mean annual growth rate of 6.62 g C·m^-2·a^-1 and a mean value of 291.57 g C·m^-2·a^-1 from 2000 to 2015. Spatially, NPP in the middle portion of the Fenhe River Basin was lower than that in its both sides. The mean annual NPP among different land types ranked as forestland > grassland > cropland > other land > construction land > water use land. The NPP of vegetation was positively correlated with temperature and precipitation. NPP was the greatest in the area with brown soil and the lowest in the area with castanocinnamon soil. NPP was influenced by topography and anthropogenic activities. It was higher in the area with higher elevation, steeper slope, and less human activities. In addition, the farther away from the Fenhe River, the larger the NPP was along the east-west transect. The NPP was relatively lower along the northsouth transect with excessive coal mining and higher urbanization rate.

Key words: evergreen broad-leaved forest, Chinese chestnut plantation, soil carbon pool, land-use change.