研究了新疆灌耕灰棕漠土腐殖质组分及其性质,并利用凝胶过滤法室内研究了外源137 Cs与土壤腐殖质各组分的结合性能。结果表明:在研究条件下1,37 Cs与粘土矿物的结合率最高,占总量的78.37%;21.63%的137Cs积累于腐殖质中,其中与胡敏酸、富啡酸、胡敏素结合的分别为5.78%、6.60%和9.25%。腐植酸与137Cs结合形成分子量较小的4个复合体,即他们的质均分子量>700,392,168和<100。但胡敏酸与金属离子137Cs不仅结合成稳定的有机无机复合体,而且可以形成稳定性更高的腐殖质金属离子配合物。 The humus constituents and their properties of gray-desert soil in Xinjiang were studied, and the binding properties of exogenous 137 Cs and the components of soil humus were studied by gel filtration. The results showed that the binding rate of 1, 37 Cs to clay minerals was the highest, accounting for 78.37% of the total, while 137.68% of 137Cs was accumulated in the humus. Among them, the binding to humic acid, fulvic acid and humin were 5.78%, 6.60% and 9.25%. Humic acid and 137Cs combine to form four complexes of smaller molecular weight, ie, their mass average molecular weights> 700, 392, 168 and <100. However, humic acid and metal ions 137Cs not only combine into a stable organic-inorganic complex, but also form a more stable humus metal ion complex.