【作者】 覃勇荣； 韦丽婷； 杨肖； 解文惠； 刘旭辉；

【Author】 Qin Yongrong;Wei Liting;Yang Xiao;Xie Wenhui;Liu Xuhui;School of Chemistry and Biological Engineering,Hechi University;

【机构】 河池学院化学与生物工程学院；

【摘要】 为探讨利用银杏树修复有色金属矿区矿业废弃地土壤重金属污染的可行性,以桂西北某矿业废弃地种植的银杏树为研究对象,采集其叶片、种子及根际土壤样品,用电感耦合等离子体质谱法(ICP-MS)测定样品中的Cd、Cu、Pb、Zn和As含量,了解银杏树种植地的土壤重金属背景及其对土壤重金属的吸收和转运能力,为利用银杏树修复矿业废弃地土壤重金属污染提供科学依据。结果表明:调查样地土壤重金属含量较高,但银杏叶片及种子的重金属含量较低,说明其对重金属具有较强的耐性,并具有较完善的防御和排斥机制;银杏叶片对Cd、Cu、Pb、Zn、As 5种重金属的平均富集系数大小顺序为Cd(0.0879)>Pb(0.0312)>Zn(0.0246)>Cu(0.0097)>As(0.0086),银杏种子对5种不同重金属的平均富集系数顺序为Cd(0.0254)> Zn(0.0129)> Cu(0.0098)> Pb(0.0069)> As(0.0028);虽然银杏不属于重金属超累积植物,但其根系发达,固土保水能力强,可有效防止重金属元素的迁移,而且生长周期长,生物量大,重金属耐性强,吸收土壤重金属元素的总量并不低,景观效果好,因此可作为土壤重金属污染修复的优良树种在环境治理中发挥积极作用。更多还原

【Abstract】 In order to explore the feasibility of using ginkgo trees to repair soil heavy metal pollution in mining wastelands in non-ferrous metal mining areas,a ginkgo tree planted in a mining wasteland in northwestern Guangxi was taken as the research object,and samples of its leaves,seeds and rhizosphere soil were collected.The contents of Cd,Cu,Pb,Zn and As in the samples were determined by inductively coupled plasma mass spectrometry(ICP-MS) to understand the background of heavy metals in the soil of ginkgo tree planting area and its absorption and transport capacity of heavy metals in the soil,so as to provide a scientific basis for remediation of heavy metal pollution in the soil of mining abandoned land by ginkgo tree.The results showed that the content of heavy metals in the soil of the investigated plots was relatively high,but the content of heavy metals in ginkgo leaves and seeds was low,indicating that it has strong tolerance to heavy metals and has a relatively complete defense and rejection mechanism.The order of the average enrichment coefficients of the five heavy metals of lead,zinc and arsenic is:Cd(0.0879)> Pb(0.0312)> Zn(0.0246)> Cu(0.0097) > As(0.0086).The average enrichment coefficient is ranked as Cd(0.0254)> Zn(0.0129)> Cu(0.0098)> Pb(0.0069) > As(0.0028);Although ginkgo biloba does not belong to the overaccumulation plant of heavy metals,its developed root system,strong ability of soil fixation and water retention can effectively prevent the migration of heavy metal elements,and its long growth cycle,large biomass,strong tolerance of heavy metal,the total amount of heavy metal elements absorbed in soil is not low,and the landscape effect is good.Therefore,It can be used as an excellent tree species for remediation of soil heavy metal pollution and play an active role in environmental management.更多还原