浙江常山县表层土壤锗地球化学特征及影响因素

通过浙江西部常山县表层土壤的调查研究,首次查明了土壤锗含量特征:研究区内表层土壤锗含量0.87~5.59 mg/kg,平均值为1.59 mg/kg,略低于中国土壤锗的平均含量1.70 mg/kg。不同成土母质的表层土壤锗含量平均值略有差异,变化范围为1.50~1.73 mg/kg,以花岗岩类风化物最大,石英砂岩类风化物最低,其他母质区土壤锗含量较接近。不同土壤类型锗含量变化范围为1.45~1.62 mg/kg,以黄壤中锗含量最高,潮土最低,其他类型土壤锗含量为1.51~1.61 mg/kg。泥质含量较高的砂岩、粉砂岩、泥岩的锗含量较高,可达1.75~1.95 mg/kg;白云岩、灰岩的锗含量低,仅为0.12~0.20 mg/kg。常山县大面积分布的砂岩、泥岩、粉砂岩等岩石锗含量较高,是土壤锗含量相对较高的主要原因。

Geochemical Characteristics and Influencing Factors of Germanium in Surface Soil of Changshan County,Zhejiang Province

Through the investigation and study of surface soil in Changshan County,western Zhejiang Province,the characteristics of germanium content in soil have been identified for the first time.The content of germanium in the surface soil of the study area ranges from 0.87 mg/kg to 5.59 mg/kg,with an average of 1.59 mg/kg,which was slightly lower than the value of the Chinese soil(1.70 mg/kg).The average content of germanium in surface soil of different parent materials is slightly different,ranging from 1.50 mg/kg to 1.73 mg/kg.The content of germanium in granite weathering is the highest,quartz sandstone weathering is the lowest,and germanium content in other parent materials is close.The content of germanium in different soil types ranges from 1.45 mg/kg to 1.62 mg/kg,with the highest germanium content in yellow earth and the lowest in fluvo-aquic soil.Germanium content in other types of soils range from 1.51 mg/kg to 1.61 mg/kg.The germanium content of sandstone,siltstone and mudstone with higher argillaceous content is higher,reaching 1.75-1.95 mg/kg,while the germanium content of dolomite and limestone is lower,only 0.12-0.20 mg/kg.The large scale distribution of sandstone,mudstone and siltstone which are high germanium content in Changshan County is the main reason for the relatively high germanium content in soil.