摘要
铜等大宗尾矿无土化原位修复是尾矿资源化、无害化利用的有效途径。修复后土壤养分蓄积直接关系到后期田间管理,对其有机碳等重要养分积累规律研究至关重要。针对我国湖北某细粒铜尾矿修复场地进行研究,对未经修复、修复一年与修复两年的0~15、15~30、30~45 cm三种深度的土壤进行取样,对总有机碳、易氧化态有机碳、颗粒态有机碳、矿物结合态有机碳、可溶性有机碳与微生物量有机碳6种土壤有机碳形态进行测定并分析其变化规律。结果表明:经无土修复后的细粒尾矿土在无外源有机物的添加下依然会进行土壤总有机碳的积累;尾矿进行有机碳积累的主要方式是以矿物结合态有机碳为代表的惰性有机碳的增加,惰性碳的升高有助于固定有机碳;尾矿的团聚体粒径尺寸与土壤总有机碳的含量呈正相关,其中惰性有机碳更偏好聚集在粒径较小的团聚结构中,土壤碳库活性逐渐增强,更容易发生有机碳的转化;对尾矿土进行修复后土壤有机碳含量有显著提高,且主要以惰性有机碳的形式积累,在该场地表现出了巨大的碳汇潜力。该研究同时明确了该场地修复后矿区土壤有机碳各形态的累积特性,可为指导尾矿修复工作提供数据支持。
Soilless in-situ remediation of copper and other bulk tailings is an effective way for its resourceful and harmless.The soil nutrient accumulation after rehabilitation is directly related to the later field management,and it is crucial to study its organic carbon and other important nutrient accumulation rules.Therefore,in this paper,based on a fine-grained copper tailings remediation site in Hubei,China,the study is conducted on the unremediated,one-year and two-year soil sampling at three depths:0-15 cm,15-30 cm,and 30-45 cm,respectively.Then,the six types of soil organic carbon of samples,namely,total organic carbon,easily oxidized organic carbon,particulate organic carbon,mineral-bound organic carbon,soluble organic carbon,and microbial biomass organic carbon,were measured and analyzed.The results show that:the fine-grained tailings soil after soil-less remediation would still accumulate soil organic carbon without the addition of exogenous organic matter;the main way of organic carbon accumulation in the tailings was the increase of inert organic carbon represented by mineral-bound organic carbon,and the elevation of inert carbon helps to fix the organic carbon;the particle size of the tailings agglomerates and the content of soil organic carbon were positively correlated,with inert organic carbon preferring the mineral-bound organic carbon,and inert organic carbon preferring the mineral-bound organic carbon.Inert organic carbon prefers to gather in the agglomerate structure with smaller particle size fine-grained tailings remediation process,resulting in the gradual increase of activity of soil carbon pool,and the remediation is more likely to occur in the transformation of organic carbon.In summary,this study showed that the soil organic carbon content increased significantly after the repair of tailings soil,and mainly accumulated in the form of inert organic carbon,which showed a huge carbon sink potential in the site.This study also clarified the cumulative characteristics of the various forms of soil organic carbon in the mining area after the site restoration,which can provide data support for guiding the tailings restoration work.
作者
刘家治
夏令
汪之翔
鲁子敬
宋少先
胡勇
LIU Jiazhi;XIA Ling;WANG Zhixiang;LU Zijing;SONG Shaoxian;HU Yong(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Sanxin Gold and Copper Co.Ltd.,Huangshi 435102,Hubei,China)
出处
《矿冶》
CAS
2024年第2期293-302,共10页
Mining And Metallurgy
基金
国际(地区)合作与交流项目(32061123009)。
关键词
尾矿
原位修复
有机碳
修复土壤
有机碳形态
土壤团聚体
碳积累
有机碳组分
tailings
in-situ remediation
organic carbon
soil remediation
organic carbon morphology
soil aggregates
carbon accumulation
organic carbon components
