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对模拟土柱淋溶下的 1 5～ 2 0 ,35～ 45 ,75～ 85 cm土层土壤作各种形态硒含量测定 ,结果表明 ,淹水土壤硒的迁移主要受硒铁化合物还原淋溶机制控制 ,其次受富里酸键合硒淋溶及机械 (粘粒 )淋溶等机制的影响 ;外加的叶蛋白硒在土壤中分解成水溶性有机硒随水淋溶 ,少量以富里酸硒积累在中下层土壤 .Se6 + (Na2 Se O4)及 Se4+(Na2 Se O3)溶液经土柱淋溶 ,主要形成富里酸硒积累于土壤 ,且表土层积累率高于中下部土层 ,Se6 +积累又高于Se4+ .淋溶过程中 Se4+的迁移强度比 Se6 +大
The contents of selenium in various forms of soil under 15 ~ 20, 35 ~ 45, 75 ~ 85 cm soil layer leaching from simulated soil column were determined. The results showed that selenium migration in flooded soil was mainly affected by selenium - Mechanism control, followed by fulvic acid-linked selenium leaching and mechanical (cosmid) leaching mechanism; the additional leaf protein selenium in the soil decomposition of water-soluble organic selenium leaching with water, a small amount of accumulation of fulvic acid selenium In the middle and lower soil, Se6 + (Na2 Se O4) and Se4 + (Na2 Se O3) solution were leached by soil column, which mainly accumulated selenium rich in soil, and the accumulation rate of topsoil was higher than that in middle and lower soil. Se6 + accumulation Which is higher than that of Se4 + .The migration of Se4 + in leaching is stronger than Se6 +