呈贡县菜区大棚土壤中重金属污染调查研究

通过对云南省昆明地区呈贡县大棚菜区土壤中重金属铜、锌、铅、镉积累的测定分析，探讨了不同年限大棚菜区土壤中重金属铜、锌、铅、镉的积累状况，结果表明：呈贡县大棚菜区土壤中铜、锌含量严重超标，积累严重，使用10a以上的大棚土壤中铜锌含量分别是昆明地区自然土壤背景值的2．22倍和1．71倍；铅积累不明显；镉含量随着使用年限的增加有增加趋势，当大棚使用年限达到10a以上时，其镉含量显著高于非大棚土壤，是非大棚土壤中镉含量的1．73倍。

Soil Heavy Metal Pollution in Vegetable Greenhouses in Chenggong County

The accumulation of copper, zinc, lead and cadmium in the soil of the vegetable greenhouses is studied through the measurement and analysis of these heavy metals. The results show that the content of the copper and zinc in the soil greatly exceeds the required standards. When the greenhouse has been in use for over ten years, the copper and zinc content in its soil are respectively 2. 22 and 1.71 times more than the background value of the natu- ral soil in Kunming. Lead does not show a high accumulation. But the content of the cadmium is increasing with the service time of the greenhouse. When it is used for over ten years, the content of cadmium is 1.73 times higher than the greenhouse-free soil.