Effect of coal mining on net primary productivity of vegetation in Shendong Mining Area

Abstract

Coal mining in Shendong Mining area has an important impact on the local ecological environment, especially the growth of vegetation. In order to describe this effect quantitatively, this study uses a regional evapotranspiration model to calculate the Potential Net Primary Productivity (PNP,p) of the Shendong mining area. MODIS17A3 dataset (2001—2022) was used to characterize the Actual Net Primary Productivity (PNP,a), and combined with the monthly net primary productivity raster dataset of terrestrial ecosystems in China (PNP,al, 1988—2015), using GWR model construction correction method to correct PNP,al to obtain 1988—2000 PNP,a data, and using the difference between the two PNP,h to characterize the impact of coal mining. The effect of coal mining on vegetation PNP in Shendong mining area was evaluated. The results show that: ① the accuracy of PNP,al data corrected by GWR model is about 0.76, and the corrected PNP,al data has a strong spatial correlation with the MODIS17A3 dataset, which indicates the reliability of the accuracy of the corrected model; ② The overall PNP,a and PNP,h of Shendong mining area showed a trend of decreasing first and then recovering gradually, but the PNP of vegetation did not recover to the pre-mining level. The mean values of PNP,h before mining and PNP,h after mining are 21.50 g/m2 and −60.20 g/m2, respectively. PNP,h<0 indicates that PNP vegetation growth in mining areas is disturbed by mining activities, and the degraded mines are mainly distributed in high-intensity mining areas (calculated in C, the same below). ③ The change of PNP value in Shendong mining area from 1996 to 2022 is mainly influenced by climate change and human activities. The proportion of human activities and climate change to ecological degradation is 35.7% and 8.2%, respectively. The \begin{document}$ {{I}}_{\mathrm{R}\mathrm{C}} $\end{document} from 1996 to 2015 is mainly about 0.5, indicating that coal mining plays a leading role in vegetation degradation. After 2016, the impact of photovoltaic power plant construction on PNP showed a promoting effect. This study is helpful to understand the impact of coal mining on the dynamic change of net primary productivity of vegetation, and provides scientific basis for vegetation restoration and high-quality development in Shendong mining area.

Keywords

• ecological environment in mining areas
• net primary productivity
• mining activities
• environmental effects of solar panel
• contribution rate index
• geographically weighted regression model