蚯蚓、秸秆和柠檬酸对少花龙葵与翅果菊修复锌铅镉污染土壤的影响  

Effects of Earthworm,Straw,and Citric Acid on the Remediation of Zn,Pb,and Cd Contaminated Soil by Solanum photeinocarpum and Pterocypsela indica

作　　者：陈敏妮 聂小奇 张杏锋[1,2] 何川黔 高波 CHEN Min-ni;NIE Xiao-qi;ZHANG Xing-feng;HE Chuan-qian;GAO Bo(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541004,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin 541004,China;College of Tourism&Landscape Architecture,Guilin University of Technology,Guilin 541004,China;College of Plant and Ecological Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学广西环境污染控制理论与技术重点实验室,桂林541004 [2]桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心,桂林541004 [3]桂林理工大学旅游与风景园林学院,桂林541004 [4]桂林理工大学植物与生态工程学院,桂林541004

出　　处：《环境科学》2023年第3期1714-1726,共13页Environmental Science

基　　金：国家自然科学基金项目(42107025);广西高等学校高水平创新团队及卓越学者计划项目(桂财教函[2018]319号);广西矿冶与环境科学实验中心项目(KH2012ZD004)。

摘　　要：外源物质调控和间作是提高重金属污染土壤植物修复效率的有效方法.采用盆栽试验研究蚯蚓、秸秆和柠檬酸对少花龙葵和翅果菊单作与间作修复Zn、Pb和Cd复合污染土壤的影响.结果表明,蚯蚓对Zn、Pb和Cd的富集系数(BCF)分别为0.07~0.13、0.10~0.26和5.64~15.52.土壤中添加秸秆能使蚯蚓生物量增加22.29%~223.87%、重金属含量下降8.15%~62.58%.蚯蚓对土壤重金属有效态含量的影响不大,但秸秆和柠檬酸对土壤重金属有效态含量分别表现为钝化和活化作用.蚯蚓对翅果菊的重金属含量影响不大,但会降低少花龙葵的重金属含量;秸秆对翅果菊重金属含量表现为抑制效应,但对少花龙葵Cd含量表现为促进效应;柠檬酸对少花龙葵重金属含量影响不大,但是会显著提高翅果菊的Pb含量.间作显著降低土壤重金属有效态含量,明显提高植物根的重金属含量,但对植物地上部重金属含量影响不大.植物对Zn、Pb和Cd的总提取量主要表现为:翅果菊>间作>少花龙葵.添加蚯蚓可以使翅果菊Zn、Pb和Cd总提取量分别提高12.49%、35.89%和29.01%;添加秸秆+蚯蚓可以使翅果菊Pb总提取量增加87.21%.研究表明,秸秆显著促进蚯蚓生长并降低其对重金属的富集,蚯蚓单独或者与秸秆结合添加能够有效提高翅果菊对Zn、Pb和Cd污染土壤的修复潜力.Regulation of exogenous substances and intercropping are effective methods to improve the efficiency of phytoremediation of heavy metal contaminated soil.A pot experiment was used to study the effects of earthworms,straw,and citric acid on the remediation of Zn,Pb,and Cd contaminated soil by monocropping and intercropping of Solanum photeinocarpum and Pterocypsela indica.The results showed that the bioaccumulation factors(BCF)of earthworms for Zn,Pb,and Cd were 0.07-0.13,0.10-0.26,and 5.64-15.52,respectively.The addition of straw in the soil increased the biomass of earthworms by 22.29%-223.87%but reduced the heavy metal concentrations by 8.15%-62.58%.Straw and citric acid showed passivation and activation effects,respectively,but earthworms had no significant effect on the available concentrations of heavy metals in the soil.Earthworms had no significant effect on the heavy metal concentrations of P.indica but reduced the heavy metal concentrations of S.photeinocarpum.Straw showed an inhibitory effect on the concentrations of heavy metals in P.indica but promoted the concentrations of Cd in S.photeinocarpum.Citric acid had no significant effect on the heavy metal concentrations in S.photeinocarpum but significantly increased the Pb concentrations in P.indica.Intercropping significantly reduced the soil available heavy metal concentrations and increased the heavy metal concentrations in plant roots;however,it had no significant effect on heavy metal concentrations in plant shoots.The total extraction amounts of Zn,Pb,and Cd by plants were mainly manifested as P.indica>intercropping>S.photeinocarpum.The addition of earthworms increased the total extraction amounts of Zn,Pb,and Cd by 12.49%,35.89%,and 29.01%,respectively,and the addition of straw+earthworms increased the total extraction amounts of Pb by 87.21%.The results indicated that straw significantly promoted the growth of earthworms and reduced their accumulation of heavy metals,and the addition of earthworms alone or in combination with straw can effective

关 键 词：重金属污染 植物修复 蚯蚓 秸秆 柠檬酸 间作 

分 类 号：X171.5[环境科学与工程—环境科学]