粤东北银锑矿尾矿区土壤重金属含量及对绿豆种子萌发的生态毒性

Heavy Metal Content of Soil ﹠ Eco-toxicology on Seed Germination of Vignaradiate in Northeastern Guangdong Ag-Sb deposit

研究粤东北银锑矿尾矿区周边土壤的理化性质、6种重金属元素（Pb、Zn、Cu、Cd、Ni、Cr）的含量以及土壤重金属污染对绿豆种子萌发的影响,结果表明：（1）p H界于4.24~6.56之间,土壤较贫瘠;（2）土壤重金属污染属Cd-Ni-Zn复合型污,其中,Cd含量为0.72~1.93mg/kg（平均含量为1.22 mg/kg）,超标严重;（3）发芽指数为5.4~7.0,各样点间虽有差异,但差异不显著,而活力指数（30.1~44.0）、苗长度（4.3~7.1cm）均达到了差异极显著水平（P〈0.01）.

In order to better expand land reclamation and ecological reconstruction,physical-chemical properties,contents of 6 heavy metals element and its effects on seed germination of Vigna radiate in Northeastern Guangdong Ag-Sb deposit were studied. The chief results were as follows：（ 1） PH of soils was between 4. 24 ~ 6. 56 and the soil relatively poor;（ 2） soil heavy metal pollution was mainly due to the compound Cd-Ni-Zn,of which Cd average content of soil was 1. 22 mg / kg（ between 0. 72 to 1. 93 mg / kg） and much higher than the national secondary standard of GB 15618-1995（ Environmental quality standard for soils in P. R. China）;（ 3） germination index was between5. 4 ~ 7. 0,different sampling points despite differences,but the difference was not significant,and vitality index（ 30. 1 ~ 44. 0） and seedling length（ 4. 3 ~ 7. 1cm） respectively reached significant difference level.