仙桃市西南部土壤与农作物中硒的分布特征

Distribution Characteristics of Selenium in Soils and Crops in Southwestern Xiantao

通过1∶5万表层土壤地球化学调查,对仙桃西南部3个乡镇土壤及农作物硒元素含量的数据研究,发现区内土壤表层总量硒平均值为0.322 mg/kg,背景值为0.315 mg/kg,高于江汉平原及全国背景值;富硒土壤硒平均含量为0.45 mg/kg,变化范围0.40~0.69 mg/kg,存在富硒地块面积约57.11 km2,占调查区面积11.56%;采集农作物样品183件,达到江西省富硒标准134件;土壤富硒区内采集农作物样品93件,达到江西省富硒标准82件;土壤富硒分布特征表现为北低南高并呈带状分布明显,主要受成土母质和沉积环境双层的控制;农作物则表现为散状分布,无明显规律;研究表明该地区土壤富硒与农作物富硒存在多因素关联性。

Based on the results of land quality geochemistry in 3 townshipsofsouthwest Xiantao, the distribution character-istics of selenium in soil are systematically summarized. The overall data rely on the past two years in southwest of Xian-tao area soils and crops of selenium resources,soil total selenium average value is 0. 322 mg/kg, the background value is 0. 315 mg/kg,higher than Jianghan Plain and the background value, there are rich land area of about 57. 11 km2, ac-counting for the survey area of 11.5 6 % crops;183 samples of crops are collected, reaching 134 selenium rich standards. In this paper,the author rely on the overall data of soil and crop selenium resources in the southwest of Xiantao in recent two years,and gives a relatively detailed reference for researchers and practitioners in related fields.