Abstract
Coal gangue is an inevitable product in coal mining and processing and is the most important source of pollution in mines. Vegetation restoration of coal gangue piles must consider its special site conditions. Therefore, we conducted unmanned air vehicle (UAV) temperature monitoring, field investigation and experimental analysis on spontaneous combustion coal gangue piles in Lu’an mining area. In the vegetation construction of coal gangue piles, high-temperature stress affects plant survival. The spontaneous combustion coal gangue piles have abnormal temperature, high surface temperature and few vegetation types. The plant community species diversity index (Shannon–Wiener index, Pielou’s index and Species abundance index) is small, the plant community is single and the plant diversity is low. Spontaneous combustion of coal gangue leads to soil acidification, reducing soil water content, soil organic carbon (SOM), available nitrogen (AN), available potassium (AK) and available phosphorus (AP). These factors are single or interactive in plants and have an impact on plant survival and growth. The research results are of great significance to the vegetation restoration of spontaneous combustion coal gangue piles, ecological reconstruction and the improvement of the ecological environment of coal mine areas.
Highlights
Accepted: 9 January 2022China is the biggest country of coal production and consumption, and coal mainly is used as power fuel and to generate electricity
Use the Pix4D mapper software to stitch the images collected in the experiment to obtain the complete image of the study area, input the control points for image geometric correction, and use ENVI
The results showed that plant community didiversity was significantly correlated with soil properties (p < 0.05), Shannon–Wiener index versity was significantly correlated with soil properties (p < 0.05), Shannon–Wiener index and Species abundance index were significantly negatively correlated with ground temand
Summary
China is the biggest country of coal production and consumption, and coal mainly is used as power fuel and to generate electricity. Waste rocks are generated in the process of mine construction, coal mining and raw coal washing to form gangue piles. Gangue piles are severe problem in coal-producing countries. The stock of coal gangue in China alone has reached 4.5–5 Gt, with an average annual increase of 0.37–0.55 Gt [1]. The large accumulation of coal gangue occupies a large amount of land and causes serious environmental pollution. The spontaneous combustion of coal gangue emits harmful gases such as SO2 , H2 S, CO, CO2 , and nitrogen oxides, accompanied by a large amount of smoke and dust. Coal gangue piles can cause geological disasters such as collapse and mudslides
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