Abstract：[Background] The arid desert area located in Northwest China is an important coal base. Large-scale and high-intensity development has caused the long-term accumulation of coal gangue, further resulting in the natural ecosystem fragility. Coal gangue is often used as an additive or substrate component in the process of vegetation restoration in the mining area. However, coal gangue with poor structure and low water-holding capacity restricts the improvement of the ecological environment in the mining area. Fly ash is characterized by the large specific surface area and strong adsorption capacity, and can be used as a soil conditioner to promote the growth of plants. In this study, the mixture of coal gangue and raw soil was taken as the research object, and the effects of adding fly ash on the physical, chemical, and biological properties of coal gangue matrix and plant growth were explored.[Methods] The coal gangue matrix was prepared by mixing coal gangue and raw soil at a ratio of 1:1. Then fly ash was added to the mixing coal gangue matrix according to the ratio of 0, 10%, 30%, and 50%, respectively. The potting substrate was incubated in a greenhouse for 1 month and then tall fescue (Festuca elata) seeds were sown. After 3 months, tall fescue biomass was measured, and soil was collected for determining the physical, chemical, and biological properties of the potting substrate.[Results] 1) With the increase of addition ratio for fly ash, the bulk density and sand content of the substrate in the pots decreased; whereas the content of the field water-holding capacity, silt content, dissolved organic carbon and available phosphorus increased. Compared with 30% in potting substrate, 50% fly ash addition significantly reduced the organic carbon content and increased the available phosphorus content, whereas no significant difference was found in the other chemical properties. 2) Compared with fly ash zero addition, the contents of total phospholipid fatty acids (PLFAs) and bacterial PLFAs when adding 30% and 50% fly ash in the potting substrate increased by 38.07%, 47.80%, and 43.04%, 27.40%, respectively. There was no significant difference in phospholipid fatty acid content between 30% and 50% fly ash addition in potting substrate. 3) With the increase of fly ash addition, plant height, biomass and nutrient content showed an increasing trend, and 50% fly ash addition was the most significant among the treatments.[Conclusions] The addition of fly ash can improve the properties of the coal gangue matrix and promote the growth of plants. Based on the practical application, 30%-50% fly ash was recommended in the coal gangue matrix as the substrate for plant growth. The study results can provide basic data support for the utilization of solid waste and the reconstructed soil during the vegetation restoration in the mining area.
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2022, Vol. 20 
