为了明确煤田工作面开采沉陷对农田土壤和植被碳库的扰动影响,分别选取了开采沉陷坡面样区和未受开采沉陷影响对照区,在对沉陷样区坡度进行预测的基础上,运用DNDC模型模拟了实验区2013—2015年的农田土壤有机碳储量和植被NPP,并对模拟结果进行分析,同时,对DNDC模型在本研究区的适宜性进行了验证。研究结果显示:(1)在煤田工作面开采沉陷影响下,农田土壤和植被碳库有显著的失碳效应,且随煤田工作面开采工作的持续,其碳损失量越大。(2)在开采沉陷区,坡度的升高是农田土壤和植被碳库储量发生明显变化的主要原因。(3)通过精度评价发现DNDC模型可准确模拟煤田开采沉陷区农田生态系统碳循环过程,基于DNDC模型的煤田开采沉陷下农田土壤和植被碳库扰动预评价精度整体上较好。

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.