四川兴文地区硒的地球化学特征及生物效应

四川兴文土地质量调查显示:兴文县表层土壤中硒质量分数为0.075~2.540 mg/kg,平均值为0.43 mg/kg,富硒土地面积占调查面积53.25%,合计734.75 km^2。全区大米硒质量分数平均值为0.064 mg/kg,硒含量处于较为富足水平。水稻中的硒元素含量与根系土中硒元素呈明显正相关关系。根系土中水溶态硒和离子交换态硒含量高时,土壤容易产出富硒作物。

Geochemistic Charactristics and Biological Effects of Selenium-Rich Soil in Sichuan xingwen

The results showed that the content of selenium in the surface soil of Xingwen County was 0.075~2.540 mg/kg, the average value was 0.43 mg/kg, and the area of selenium-enriched land was 734.75 square kilometers, accounting for 53.25% of of the survey area.The average content of Se in the rice was 0.064 mg/kg, and the selenium content was at a relatively high level.There was a positive correlation between the content of selenium in rice and root soil.When the water-soluble and ion-exchangeable selenium is higher in the root soil, it is easy to produce selenium-rich crops.