Effects of Different Ecological Measures on Water Use Characteristics of Amorpha fruticosa in Open Pit Coal Mine Areas

Xi’an University of Science and Technology

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    [Purpose] To explore the water use characteristics of typical plants under different ecological measures in the waste dump, improve plant water use efficiency, and accelerate the ecological restoration process in the mining area. [Method] Six ecological measures (control, inoculation, green fertilizer, inoculation+green fertilizer, inoculation+weathered coal, inoculation+green fertilizer+weathered coal) were taken from the waste dump of the Heidaigou Coal Mine to treat Amorpha fruticosa. The stable isotopes of hydrogen and oxygen in water were combined with other methods. [Result] (1) The soil volume moisture content of the waste dump is 3% to 9%, which is lower in 0-30, 70-100 cm soil layers, and higher in 30-70 cm soil layers. (2) The water supply of Amorpha fruticosa comes from precipitation and soil water. The soil water undergoes significant fractionation in the 0-30 cm soil layer, and shows significant differences in different ecological measures, with green fertilizer treatment being the largest and inoculation+green fertilizer treatment being the smallest. (3) There were significant differences in the water use characteristics of Amorpha fruticosa under different ecological measures. The inoculation treatment had a higher water use ratio of 53.4% in the 50-100 cm soil layer; Green fertilizer treatment mainly utilized surface (0-20) soil water, which was 42.6%; The treatment of inoculation and green fertilizer had a relatively uniform proportion of soil water use in each layer. [Conclusion] The inoculation + green fertilizer treatment optimized the water use characteristics of Amorpha fruticosa, increased the utilization ratio of surface and deep water, and can be used as an ecological reclamation measure for waste disposal sites, which promoted the ecological recovery rate and effect of arid mining areas in the western region.

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  • Received:August 06,2023
  • Revised:October 02,2023
  • Adopted:October 07,2023
  • Online: January 27,2024
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