无公害猕猴桃生产基地土壤中重金属累积状况研究

对陕西省周至县猕猴桃生产基地土壤中砷、铅、汞、镉和铜的累积状况进行了研究,结果表明:(1)土壤中砷、铅、汞、镉和铜的平均含量分别为14.22±12.38、21.27±4.26、0.65±0.50、0.32±0.09和20.22±16.69 mg/kg,土壤重金属积累不明显,均没有超过GB15618-1995土壤环境质量标准.但是,有4个样点的砷和1个样点的汞含量超标;(2)应用土壤质量环境单因子污染指数进行评价,所有土样的平均土壤重金属单因子污染指数都小于1,故所检测果园在重金属元素方面适合发展无公害猕猴桃生产,也符合其土壤环境要求,土壤各元素污染指数的高低排列顺序为:汞>砷>镉>铜>铅,其中镉、砷、汞平均指数达到0.54～0.655,尤其以汞单项污染指数很高.

Research on heavy metal accumulation in soil in an organic kiwi fruit production base

The contents of heavy metals like Se, Pb, Hg, Cd and Cu in the soil of the organic kiwi fruit production base in Zhouzhi Country of Shaanxi Province were investigated and analyzed. The results showed that:(1) The average contents of Se, Pb, Hg, Cd and Cu in the soil were respectively(14.22± 12.38)mg/kg, (21.27±4.26) mg/kg, (0.65±0.50) mg/kg, (0.32±0.09) mg/kg and (20.22±16.69) mg/kg, and the accumulation of heavy metals in soil was not obvious, not surpassing the environment quality standard for soils GB15, 618-1,995. But there were 4 samples of Se and 1 sample of Hg content which exceeded the permitted level; (2) Using a single factor of soil quality environment pollution index to evaluate the average single factor pollution index of soil heavy metals of all the soil sam-ples, the result was smaller than 1, 8o the tested orchards were fit for developing green kiwi fruit production and also met the environment requirement for soil. The order of pollution indexes of various soil elements was: Hg> Se> Cd> Cu >Pb, among which the average index of Cd, Se and Hg reached 0.54 ~ 0.655, and the single item pollution index of Hg was the highest.