石灰配施有机物料对酸性镉污染土壤修复研究  

Study on Remediation of Acidic Cadmium Contaminated Soil by Lime and Organic Material

作　　者：张雨佳 李光辉 陈宏[1,2] ZHANG Yujia;LI Guanghui;CHEN Hong(College of Resources and Environment,Southwest University,Chongqing 400715;Chongqing Key Laboratory of Agricultural Resources and Environment Research,Chongqing 400715)

机构地区：[1]西南大学资源环境学院,重庆400715 [2]重庆市农业资源与环境研究重点实验室,重庆400715

出　　处：《中国农学通报》2023年第27期52-58,共7页Chinese Agricultural Science Bulletin

基　　金：重庆市科学技术局重点研发项目“‘双超’重金属镉、砷污染农田土壤快速原位修复关键技术研究与应用示范”(cstc2018jszxzdyfxmX0017)。

摘　　要：耕地土壤质量是农产品质量安全的保障,本文以重庆市紫色土为研究对象,通过室内模拟试验,分析探讨石灰和有机物料配施对镉污染土壤的影响及土壤Cd形态转化机制。结果表明:施用修复剂可提升土壤pH、有机质(OM)含量和阳离子交换量(CEC),试验中OM含量和CEC的提升能显著降低Cd活性,使Cd由酸可提取态向可氧化态、可还原态和残渣态转化。石灰配施有机物料对土壤Cd钝化效果优于石灰单施处理,其中,石灰+油枯处理表现出最佳钝化效果,有效Cd含量降幅最高达52.56%,酸可提取态Cd占比下降至35%。分析表明:细菌群落数量与Cd活性呈极显著正相关,试验所设置的Cd胁迫程度对土壤细菌生长产生刺激效应,修复剂施用后,各处理细菌生长曲线趋于收敛,呈现一致的变化趋势。soil quality of arable land is the guarantee of agricultural products quality and safety.Taking the purple soil in Chongqing as the research object,this paper analyzed and discussed the influence of lime and organic materials on cadmium-contaminated soil and the transformation mechanism of soil Cd morphology through an indoor simulation test.The results showed that the application of remediation agents in the soil could enhance soil pH,OM content and CEC and transform Cd from an acid-extractable state to oxidizable,reducible,and residual states,thus reducing its activity.The effect of lime with organic material application on soil Cd passivation was better than that of lime alone treatment,in which the lime+oilcans treatment showed the best passivation effect with the highest reduction of 52.56%ineffective Cd content,the proportion of acidextractable Cd dropped to 35%.The results showed that the number of bacterial communities was significantly and positively correlated with Cd activity,the Cd stress level set by the experiment had a stimulating effect on soil bacterial growth,and the bacterial growth curves of each treatment tended to converge after the application of the remediator,showing a consistent trend.

关 键 词：土壤CD污染 石灰 有机物料 Cd钝化 

分 类 号：X53[环境科学与工程—环境工程]