The net primary productivity (NPP) of vegetation is a vital indicator for assessing a basin ecosystem. Based on a long time series of NPP data of 2000—2019 from a moderate resolution imaging spectroradiometer (MODIS), this study analyzed the spatio-temporal variations in the vegetation NPP of the Dongting Lake basin in the past 20 years. Then, it revealed the influence characteristics and contribution of driving factors (e.g., meteorology and ground surface) on the vegetation NPP of the study area using methods including the GIS spatio-temporal analysis and GeoDetector. The results are as follows. ① The NPP values in the study area have an average of 0.65 kgC/(m2·a), with high values mainly distributed in the west and south of the basin and low values concentrated near the lake. ② During 2000—2019, the vegetation NPP of the Dongting Lake basin presented a slightly rising trend (y=0.003x+0.622 7, R2=0.437, p<0.001). It increased in the northwest and south-central parts and decreased in the northeast and southwest boundaries, and its center of gravity slightly shifted. ③ The changes in the vegetation NPP of the Dongting Lake basin was significantly affected by meteorological factors (especially temperature). By contrast, its spatial characteristics were mainly affected by land use, followed by precipitation and DEM. In addition, the results suggested significant interactions between different factors, which was mainly reflected by the bi-factor enhancement (DEM and land use, or DEM and precipitation) and nonlinear enhancement (temperature and precipitation, land use and DEM, and precipitation and land use). The conclusions of this study help to correctly understand and grasp the spatio-temporal characteristics of the vegetation NPP of the Dongting Lake basin and their internal influencing mechanisms, thus providing a scientific basis for the management and governance of the ecosystem in the basin.
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2022, Vol. 34 
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