摘要
通过分析赣南大余地区农田土壤As、Cd元素化学形态含量,研究土壤中As、Cd元素形态含量特征和垂向变化、全量与形态含量的相关性。研究表明,赣南大余地区农田生态系统中土壤残渣态As、离子交换态Cd含量分别为22.14mg/kg和0.437mg/kg,分别占其总量的76.88%和54.97%;异常区表层土壤As、Cd元素的活动态百分比含量分别为4.03%和70.29%,分别高出对照区1.55倍和0.61倍;受污灌或洪水漫淹的农田土壤中As、Cd元素活动态含量具有垂直分布特征,其在0～20cm的表层土壤中富集显著,而20cm之下的土层含量有不同程度的下降。随表层土壤As、Cd元素总量增加,残渣态As和离子交换态Cd的百分比含量增加,而其它形态的百分含量下降或无显著变化。
Content,vertical exchange,correlation of total content and speciation content were determined by geochemical speciation analysis of As and Cd in farmland soil in Dayu County,Jiangxi Province.The results showed that the contents of residual As and ion exchange Cd were 22.14mg/kg and 0.437mg/kg,which accounted for 76.88%and 54.97%,respectively.The percentage of mobile As and Cd in abnormal topsoil were 4.03% and 70.29%,1.55 and 0.61 times higher than that of the controlled areas,respectively.The contents of As and Cd in the farmland soil affected by sewage irrigation or flood had the characteristics of vertical distribution existed as significant enrichment in topsoil of 0~20cm,varying degrees of decline under 20 cm.With the increasing of As and Cd in topsoil,the percentage content of the residual As and ion exchange Cd increased,while the other speciation contents decreased or with no significant changing.
出处
《资源调查与环境》
2015年第4期298-305,共8页
Resources Survey & Environment
基金
中国地质调查局地质调查项目"江西省大余-南康地区1:25万区域地球化学调查"(项目编号:1212011087083)
