CAJ | 학술논문

通过野外调查采样,分析了湖南冷水汀锑矿区土壤的重金属含量,以及矿区9个采样点的苎麻对Sb、Cd、As和Pb 4种重金属的吸收与富集能力及其富集特征.结果表明,矿区土壤受Sb污染严重,9个采样点Sb含量超过全国土壤背景值40～11503倍;伴生有Cd、As、Pb污染,Cd平均含量(13.08 mg·kg~(-1))和As平均含量(82.64 mg·kg~(-1))明显高于土壤环境质量标准的三级警戒值,Pb平均含量(71.27 mg·kg~(-1))明显高于全国土壤背景值.苎麻叶和花混合样中的Sb最高达到1103 mg·kg~(-1);苎麻体内的Cd含量均高于一般植物2～10倍,Cd富集系数最高为2.1,转运系数最高为3;As富集系数最高为1.04,转运系数最高为12.42;苎麻地上部对重金属迁移能力较强,当季对Sb、Cd、As迁移量分别达796.55、11.20和31.34 mg·m~(-2).本研究说明苎麻对复合重金属具有一定的耐性,为复合污染植物修复提供了一种新的种质资源.
통과야외조사채양,분석료호남랭수정제광구토양적중금속함량,이급광구9개채양점적저마대Sb、Cd、As화Pb 4충중금속적흡수여부집능력급기부집특정.결과표명,광구토양수Sb오염엄중,9개채양점Sb함량초과전국토양배경치40～11503배;반생유Cd、As、Pb오염,Cd평균함량(13.08 mg·kg~(-1))화As평균함량(82.64 mg·kg~(-1))명현고우토양배경질량표준적삼급경계치,Pb평균함량(71.27 mg·kg~(-1))명현고우전국토양배경치.저마협화화혼합양중적Sb최고체도1103 mg·kg~(-1);저마체내적Cd함량균고우일반식물2～10배,Cd부집계수최고위2.1,전운계수최고위3;As부집계수최고위1.04,전운계수최고위12.42;저마지상부대중금속천이능력교강,당계대Sb、Cd、As천이량분별체796.55、11.20화31.34 mg·m~(-2).본연구설명저마대복합중금속구유일정적내성,위복합오염식물수복제공료일충신적충질자원.
Ramie(Boehmeria nivea)is a perennial plant species that has large biomass.A study was conducted to investigate heavy metal contents in ramie and its associated soil in a antimony mining area in Lengshuijiang city of Hunan Provice.Contents of such heavy metals as Sb,Cd,As and Pb were determined in ramie from 9 contaminated sites in order to assess their potentials in phytoremediation of heavy metal polluted areas. The result revealed that soils of the mining area were highly contaminated by Sb,the Sb concentration of 9 sites was 40 to 11 503 times than the background value of heavy metals in China. On average,the concentration of Cd (13.08 mg·kg~(-1))and As(82.64 mg·kg~(-1))were significantly higher than the warning value of environmental quality standard for soils,while the concentration of Pb (71.27 mg·kg~(-1))was significantly higher than the background value of heavy metals in China. The highest Sb concentration in mixture of leaves and inflorescences was 1103 mg·kg~(-1) Cd concentration in ramie was over 2 to 10 times than that in other plant species.Among these samples,both the highest bioaccumulation factor(BF)and transfer factor(TF)were over 2 for Cd,and the highest BF and TF of As was greater than 1 and 12 respectively,indicating their potentials in situ remediation of the heavy metal soils.The total translocation of Sb,Cd and As in the third crop was up to 796.55 mg·m~(-2),11.20 mg·m~(-2) and 31.34 mg·m~(-2) respectively. These suggested that ramie had the tolerance of Sb,Cd and As combined pollution,which provided a new genetic resource for phytoremediation of combined polluted soil.