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对我国8种典型土壤中硒淋溶迁移的研究表明,硒的淋溶与土壤PH呈正相关关系,与土壤中粘粒含量,Al_2O_3等倍半氧化物的含量、土壤硒的吸附系数呈负相关关系。受这些因素影响,不同土壤硒的淋溶强度不同。本文计算了天然降雨条件下不同土壤中硒的淋溶率。结果表明,土壤硒淋溶率受有机质等土壤理化性质的影响,变化范同为0.35—2.22％,其顺序为:紫色土>褐土>暗棕壤>黑钙土>黑土>红壤、砖红壤>灰钙土。比较我国低硒—克山病病带土壤与足硒—非病带土壤的硒淋溶率的差异,病带土壤中硒的淋溶率显著大于非病带土壤,这可能是病带土壤硒低的原因之一。
Selenium leaching in eight typical soils of China showed that there was a positive correlation between the leaching of selenium and the pH of soil, and negatively correlated with clay content, Al 2 O 3 iso sesquioxide content and selenium adsorption coefficient relationship. Affected by these factors, different soil leaching strength of selenium is different. In this paper, the leaching rate of selenium in different soils under natural rainfall was calculated. The results showed that the leaching rate of selenium in soil was affected by soil physical and chemical properties such as organic matter, and the variation range was 0.35-2.22%. The order of the selenium leaching rate was purple soil> brown soil> dark brown soil> black soil> black soil> red soil, > Calcareous soil. Comparing the difference of selenium leaching rate in selenium-non-diseased zone soils from Sequoia-Keshan disease in China, the leaching rate of selenium in diseased zone was significantly higher than that in non-diseased zone, which may be the result of Se One of the low reasons.