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Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (2): 56-62.doi: 10.11924/j.issn.1000-6850.casb2024-0316

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Changes in Soil Quality During Process of Bauxite Residue Soilization

LIU Zhongsen1,2(), ZHAO Ya1,2(), XUE Haitao1,2, ZHAO Yongchao1,2, YUE Jingjing2,3, GONG Weizheng1,2   

  1. 1 Henan Geological Environment Exploration Institute Co., Ltd, Zhengzhou 450007
    2 Soil Pollution Prevention Engineering Technology Research Center in Zhengzhou City, Zhengzhou 450007
    3 Henan Provincial Environment Planning & Designing Co., Ltd., Zhengzhou 450007
  • Received:2024-05-07 Revised:2024-11-01 Online:2025-01-13 Published:2025-01-13

Abstract:

The bauxite residue disposal area in Jiaozuo, Henan Province was selected as the experimental platform to study the process of bauxite residue soilization through substrate amendment and planting different plants. The changes in soil quality during the process of bauxite residue soilization were analyzed, providing reference for the bauxite residue soilization improvement and vegetation reconstruction of bauxite residue disposal area. In this experiment, 8 treatments were set up, including bauxite residue undisturbed soil (CN), only substrate amendment without planting plants in the open space (KD), planting Tamarix (CL), planting Suaeda salsa (JP), planting ryegrass (HMC), planting Artemisia annua (QH), planting mugwort (AC), and planting fungus grass (QC). After planting plants for 3 years, samples were taken from different plots to determine the physical, chemical and biological properties of the soil after soil improvement. The impact of planting different plants on soil quality was analyzed, and the changes in soil quality during the process of bauxite residue soilization were studied from the perspective of ecological reconstruction. The results showed that after planting plants in the bauxite residue disposal area for 3 years, the soil properties of different plots changed to varying degrees, and there were significant differences in soil properties before and after treatment. After planting plants, the soil bulk density decreased by 54.17% to 67.19%, soil porosity increased by 109.38% to 137.50%, pH decreased by 0.8-1.77 units, organic matter increased by 38.15% to 245.95%, total nitrogen and alkaline nitrogen increased by 250.00% to 1975.00% and 106.53% to 501.94%, total phosphorus and available phosphorus increased by 132.71% to 228.97% and 105.59% to 681.36%, available potassium increased by 1.41% to 32.80%, and there was a significant increase in the number of bacteria, fungi and actinomycetes. Compared with undisturbed bauxite residue and open spaces without planting plants, soil improvement of bauxite residue can improve the physical, chemical, and biological properties of the soil. The change in soil quality during the process of bauxite residue soilization also promotes the ecological restoration of the bauxite residue disposal area.

Key words: bauxite residue disposal area, soilization, microbial quantity, ecological restoration, soil quality