【摘要】 本文研究了我国部分自然土壤中氧化铁、氧化锰及有机质三种组分对原有土壤中锌的富集能力。并比较了不同土壤类型中各组分对锌的富集能力,探讨了土壤环境条件主要为pH对组分富集能力的影响。结果表明,土壤中这三种组分其单位含量对锌的富集能力为:氧化锰>氧化铁>有机质;三:种组分对锌的富集能力在土壤间的变化以氧化铁最为明显,其顺序为石灰性土壤>中性土壤>酸性土壤;土壤pH对土壤氧化铁富集锌能力的影响也很明显。氧化铁对锌的富集分配比例为:酸性土壤<5,中性土壤5—15,石灰性土壤≥15,各土壤组分对锌的富集容量次序为:氧化铁>有机质>氧化锰,氧化铁中,晶形铁>无定形铁。更多还原

【Abstract】 The enrichment capability of native zinc by iron oxide, manganese oxide and organie matter in 18 soils of the eastern China were studied with the sequential extraction fractionation procedure. Soils used include 5 acid soils, 5 neutral soils and 8 calcareous soils which are derived from 11 kinds of parent materials from south to north in China.The enrichment capability of native zinc by per unit soil components is different from enrichment capacity of soil components, and a comparative study of them were conducted.The enrichment capability of native zinc by per unit components may be expressed as enrichment distribution ratio （EDR） and enrichment capacity as distribution coefficient （DC）:EDR=（enrichment capacity/total zinc/amonnt of component） × 100,DC=（enrichment capaeity/total zinc） × 100,EDR of various components in soils of the eastern China is, in general, as follows: manganese oxide>iron oxide>organic matter and amorphorous iron oxide>crystalline iron oxide, being in the same order as the enrichment capability of per unit of these components. In addition, there is the same tendency for enrichment capability of per unit of these components from acid soils to calcareous soils, i.e., calcareous soils>neutral soils> acid soils. This shows that enrichment capability of per unit of components is related with their properties and increases with soil pH.The distribution of EDR. of soil components is characterized by somewhat geography distribution especially for iron ,oxide. From south to north in the eastern China, the EDR of iron oxide increases. It is≤5 in acid Soils, 5—15 in neutral soils and ≥15 in calcareous soils. Geography distribution is related with the effect of soil pH on the enrichment capability of zmc in soil. The optimium regression equation ,of EDR of iron oxide （y） with.8 soil properties （x） is that: y =-20.80+6.26pH (r=0.64^**, n=18). Soil pH is one of the most irnportant factors controlling the enrichment capability especialIy for iron oxide.But the enrichement capacity of native zinc by various soil components as DC is in the following order: iron oxide>organic matter>manganese oxide and Cox. iron oxide>Amor. iron oxide. This shows that although the enrichment capability of per unit of manganese oxide is more than.that of iron oxide, the enrichment capacity of iron oxide is more than that of manganese oxide becouse of more iron ,oxide in soil. The same as Amor. iron oxide and Cox. iron oxide. On the other hand, this relates with the transformationof amorphorous iron oxide Zn into crystalline iron oxide Zn with the elapsing of time.The enrichment capacity of iron oxide in different soils is as follows: calcareous soils>neutral soils>acid soils.And it is obvious that the enrichment capacity of soil components depends not only on the enrichment capability of per unit of soil components, but also on the components amount in soil.更多还原