Research on soil reconstruction and growth response of Solanum nigrum based on fully solid waste materials

MEI Zhen-ran; ZHAO Zhong-qiu; YANG Qiao; HE Ying; BAI Hang; SHI Meng-chao

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China Environmental Science ›› 2025, Vol. 45 ›› Issue (5) : 2608-2619.

Soil Pollution Control

Research on soil reconstruction and growth response of Solanum nigrum based on fully solid waste materials

MEI Zhen-ran¹, ZHAO Zhong-qiu^1,2,3, YANG Qiao^2,4, HE Ying¹, BAI Hang¹, SHI Meng-chao¹

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Abstract

In this study, fly ash, blast furnace slag, desulfurization gypsum, sludge, straw, and sawdust were utilized as raw materials. These materials were mixed at varying ratios, and Solanum nigrum was selected as the experimental plant for indoor pot trials. Farmland soil and contaminated soil from a metal mining wasteland were employed as controls. Variance analysis and Mantel tests were employed to analyze the effects of substrate ratios on Solanum nigrum growth characteristics, physicochemical properties of reconstructed soil, and relationships between substrate materials. A minimum dataset (MDS) for soil quality evaluation and entropy-weighted TOPSIS were applied to identify optimal substrate ratios. The results demonstrated that reconstructed soils formed by different solid waste ratios exhibited loose textures and enhanced water retention. Organic matter content was measured within a range of 39.01~70.03g/kg. All solid waste-based reconstructed soils were found to support Solanum nigrum growth, with biomass ranging from 0.11 to 3.18g/pot. A minimum dataset for soil quality assessment was established based on four critical indicators: chlorophyll content, plant height, pH, and water stability of 0.5~1mm aggregates. Subsequently, the entropy-weighted TOPSIS model was applied to systematically evaluate the comprehensive quality of the reconstructed soils. The optimal combination ratio, identified as fly ash: blast furnace slag : desulfurization gypsum : sludge : straw at a mass ratio of 4:2:1:1:2, demonstrated superior performance in both plant growth and soil functionality.

Key words

comprehensive utilization of solid waste / comprehensiveevaluation system / ecological restoration of waste land / soil reconstruction

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MEI Zhen-ran, ZHAO Zhong-qiu, YANG Qiao, HE Ying, BAI Hang, SHI Meng-chao. Research on soil reconstruction and growth response of Solanum nigrum based on fully solid waste materials[J]. China Environmental Science. 2025, 45(5): 2608-2619

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