Abstract:
Background Coal mining has caused a severe impact on the ecological environment of Lingwu area, and its ecological restoration work has been widely concerned. In order to study the restoration effects of the gangue discharge slope under different ecological restoration projects, the restoration effects were evaluated by quantitatively estimated the ecosystem service value and taking the typical gangue dump in Lingwu Coal Mine Area as the research objects.
Methods According to the principle of restoration ecology, based on the UAV remote sensing images to classify the land uses in the study area, the revised equivalent factor method was used to analyze the representative gangue dumps in the Lingwu coal base among pre-occupation, before and after implementing restoration measures. And the value of ecosystem services per unit area of the three scenarios was estimated and studied to quantitatively evaluate the ecological restoration effects.
Results The unit area ecosystem service value in Lingwu gangue dump experienced a sharp decline and gradual improvement before mining, before and after implementing restoration measures.Among them, the highest value was Meihuajing gangue dump in 2020 (13372 Yuan), which recovered to 78.02% of the original one, and climate regulation and hydrological modulation were the main single ecosystem services.
Conclusions The ecological restoration effect of Meihuajing gangue dump is better than those of the same area. It is revealed that the appropriate ecological restoration project in the ecological restoration process in the arid desert coal mine area of Northwest China is an important reason for the ecological restoration and the improvement of ecosystem service value.