Pre-evaluation of disturbance of farmland soil and vegetation carbon pool by mining subsidence in coal face

The carbon pool of farmland ecosystem is an important constituent part of terrestrial ecosystemcarbon pool, which is closely related to human activities. As one of the most severe human activities that affect the farmland ecosys- tem,coal mining not only seriously damages the carbon pool of farmland ecosystem,but also harms the regional and global ecological environment. In order to clarify the disturbance of the soil and vegetation carbon pools by the mining coal working surface,the study selected the experimental area,which is not affected by the coal mining subsidence and the sample area of the subsidence slope,based on the prediction of subsidence area on the slope,using the improved DNDC model to simulate the soil organic carbon storage and the vegetation NPP content of experimental area in 2013—2015,then analyzed the simulation results. At the same time,the suitability of the DNDC model in this study area was verified. The conclusions are as follows:① under the influence of coal mining,the carbon pool of farmland soil and vegetation has significant carbon loss effect,and the carbon loss increases with the continuous exploitation of coal face. ② In the coal mining subsidence area,the increase of slope is the main reason of obvious change of the soil and vegetation carbon storage. ③ The DNDC model can accurately simulate the coal mining subsidence area of farmland ecosystem carbon cycle process,based on the model,the pre evaluation accuracy of the farmland soil and vegeta- tion carbon pool disturbance under the coal mining subsidence is better as a whole.