本文研究水热条件渐变的地带性土壤中Ｇ＿１、Ｇ＿２组胶散复合体有机、无机物的化学组成及其结合特点。结果表明：Ｇ＿２组中铁有积累现象，游离态铁、铝氧化物含量为Ｇ＿２＞Ｇ＿１，但均随土壤类型变化。松结态腐殖质（Ｈ＿１）为Ｇ＿１＞Ｇ＿２，紧结态腐殖质（Ｈ＿３）则为Ｇｉ＜Ｇ：。可提取腐殖质中，松、稳结态腐殖质之比值Ｈ＿１／Ｈ＿２和胡敏酸、富里酸之比值ＨＡ／ＦＡ，除个别上壤之外，都相差不大。Ｇ＿１、Ｇ＿＠两组复合体中都含有一定数量的络合态铁、铝和钙。初步认为Ｇ＿２中腐殖质总量及胡敏素量均高于Ｇ＿１，但不能区分为钙键复合体和铁铝键复合体。 In this paper, the chemical composition of organic and inorganic compounds in G_1 and G_2 groups in zonal soils with gradual hydrothermal conditions were studied. The results showed that there was accumulation of iron in G_2 group, and the content of free iron and aluminum oxide was G_2> G_1, both of which varied with soil types. The loosely bound humus (H_1) is G_1> G_2, and the tightly bound humus (H_3) is Gi