【摘要】 为了解石灰土中微量金属的富集特征、机理及供给能力,本文以乌江流域9条石灰岩风化剖面为对象,运用R型聚类分析和质量平衡计算方法,研究了石灰岩风化过程中V、Co、Ni和Zn的富集问题,并获得了以下认识:(1)本区石灰土中V、Co、Ni和Zn的富集程度与其它地区的石灰土相当(甚至更高),高于上陆壳(UCC)、中国土壤(CS)和世界土壤(WS);(2)V、Co和Zn在石灰土中的富集主要与铁氧化物/氢氧化物等的吸附或共沉淀产生的淀积富集有关,而Ni的富集则主要与铝硅酸盐黏土矿物吸附和其它更易溶元素强烈迁出引起的弱残留富集有关。更多还原

【Abstract】 Nine limestone weathering profiles from Wujiang catchments were selected for studying enrichment of trace metals during limestone weathering with methods of Rtype hierachical cluster analysis and mass balance calculation.The results showed that our calcareous soils have similar enrichment degree of V,Co,Ni and Zn with those from other areas(even higher),and higher than upper continental crust(UCC),China soil(CS) and world soil(WS).The enrichment of V,Co and Zn is often a result of supergene enrichment mechanism caused by adsorption or co-precipitation with phases such as Fe-oxides/hydroxides,while that of Ni is mainly related with a weak residual enrichment mechanism caused by intense leaching of other more soluble components.更多还原