青海省湟中县孙家窑土壤重金属异常成因及生态效应

Origin of the soil heavy metals anomalies and ecological effect in Sunjiayao area,Huangzhong County,Qinghai province

青海省多目标区域地球化学调查发现,湟中孙家窑地区的土壤中存在Cd、Pb、Zn、和Hg重金属元素组成的综合异常。空间上各异常元素套合较好,且异常元素组合具热液硫化物元素组合特征。经详细调查,异常源于矿化作用所致的高含量成土母岩,且异常生态效应显著,引起了较为严重的作物安全风险,特别是小麦的安全隐患最大。Cd元素的生物有效性最强,是各异常元素中风险最大的元素。建议该区较少农业种植。

A multi-objective regional geochemical survey in Qinghai province has showed a synthetic geochemical anomaly of heavy metal elements,including Cd,Pb,Zn and Hg,in soils from Huangzhong Sunjiayao areas.The elements fit well with each other spatially,and exhibit an elements combination characteristic of hydrothermal sulfides.The anomaly is attributed to source rocks caused by mineralization.And it also put severe risks to crops safety,especially for the wheat.With the strongest bioavailability,Cd has the greatest risk among the elements.