摘要
以粉煤灰、高炉渣、脱硫石膏、污泥、稻草秸秆、锯末为原材料,按照不同配比混匀后选用龙葵为试验材料进行室内盆栽试验.以农田土壤和某金属矿区废弃地污染土壤为对照,采用方差分析和Mantel检验,分析不同配比下龙葵生长特性、重构土壤理化性质及不同基质材料对其影响关系,并通过土壤质量评价最小数据集和熵权TOPSIS综合评价法确定最优配比方案.结果表明:不同固废材料配比形成的重构土壤质地疏松,持水保墒能力强;有机质含量高,范围介于39.01~70.03g/kg之间;不同固废基重构土壤均能适应龙葵生长,生物量介于0.11~3.18g/pot;基于叶绿素含量、株高、pH值及0.5~1mm水稳性团聚体四项关键指标,构建了用于评价固废基重构土壤质量的最小数据集并通过熵权TOPSIS综合评价模型,对重构土壤的综合质量进行了系统分析,筛选出最佳固废组合配比方案,即粉煤灰、高炉渣、脱硫石膏、污泥和秸秆按4:2:1:1:2的质量比为最优组合.
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.
作者
梅振然
赵中秋
杨侨
贺莹
柏航
史孟超
MEI Zhen-ran;ZHAO Zhong-qiu;YANG Qiao;HE Ying;BAI Hang;SHI Meng-chao(School of Land Science and Technology,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Land Consolidation and Rehabilitation,Ministry of Natural Resources,Beijing 100035,China;Technology Innovation Center for Ecological Restoration in Mining Areas,Ministry of Natural Resources,Beijing 100035,China;Land Consolidation and Rehabilitation Center,Ministry of Natural Resources,Beijing 100035,China)
出处
《中国环境科学》
北大核心
2025年第5期2608-2619,共12页
China Environmental Science
基金
国家重点研发计划项目(2020YFC1807604)。
关键词
废弃地生态修复
固体废弃物综合利用
土壤重构
综合评价体系
ecological restoration of waste land
comprehensive utilization of solid waste
soil reconstruction
comprehensive evaluation system
