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<p>The ecological restoration of abandoned mining sites on the Tibetan Plateau is hindered by the high fragility of environment, limited natural recovery capacity, and the few availability of guest soil supplies. To tackle the challenge of ecological restoration in the plateau mining area, the project devised an optimal soil improvement program that strategically integrated four environmentally benign materials into sandy soils at a construction sand mine in Lhasa City. This study established orthogonal experiments based on different combinations of the four materials and their dosages. After a 60-day plant cultivation period, we measured soil and plant parameters, then evaluated the test results using Principal Component Analysis (PCA), selecting the highest-scoring as the optimal dosage. The research shows that the amendment plan reduced soil alkalinity, increased organic carbon and available potassium to 130.60&#xa0;g kg<sup>− 1</sup> and 158.63&#xa0;mg kg<sup>− 1</sup>, and effectively replenished soil fertility. The soil improvement also promoted plant growth, leading to an increase of 11.95&#xa0;g in dry biomass. Metagenomics analysis revealed that the amendments enhanced microbial communities, particularly <i>Bacillus</i> spp., and significantly influenced soil denitrification and phosphoric acid ester mineralization genes. All four materials significantly improved soil fertility, enhancing plant nutrient uptake and growth. The optimal combination was 1% microbial agents, 1% slow-release fertilizer, 0.1% wheat straw, and 1.4% modified glutinous rice base. This study demonstrates that material dosage optimization plays a pivotal role in ecological restoration, providing an effective solution for rehabilitating ecological functions in high-altitude sandy soils.</p>

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Investigation of the Enhancement of Ecological Substrates in Areas of Abandoned Mining on the Tibetan Plateau

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Zixuan Su,
  • Linxue Ju,
  • Yifan Shen,
  • Zitao Dong,
  • Lei Chen,
  • Junji Zhang,
  • Renji Zhang,
  • Yangqiutong He,
  • Xiaochao Zhang

摘要

The ecological restoration of abandoned mining sites on the Tibetan Plateau is hindered by the high fragility of environment, limited natural recovery capacity, and the few availability of guest soil supplies. To tackle the challenge of ecological restoration in the plateau mining area, the project devised an optimal soil improvement program that strategically integrated four environmentally benign materials into sandy soils at a construction sand mine in Lhasa City. This study established orthogonal experiments based on different combinations of the four materials and their dosages. After a 60-day plant cultivation period, we measured soil and plant parameters, then evaluated the test results using Principal Component Analysis (PCA), selecting the highest-scoring as the optimal dosage. The research shows that the amendment plan reduced soil alkalinity, increased organic carbon and available potassium to 130.60 g kg− 1 and 158.63 mg kg− 1, and effectively replenished soil fertility. The soil improvement also promoted plant growth, leading to an increase of 11.95 g in dry biomass. Metagenomics analysis revealed that the amendments enhanced microbial communities, particularly Bacillus spp., and significantly influenced soil denitrification and phosphoric acid ester mineralization genes. All four materials significantly improved soil fertility, enhancing plant nutrient uptake and growth. The optimal combination was 1% microbial agents, 1% slow-release fertilizer, 0.1% wheat straw, and 1.4% modified glutinous rice base. This study demonstrates that material dosage optimization plays a pivotal role in ecological restoration, providing an effective solution for rehabilitating ecological functions in high-altitude sandy soils.