西藏拉屋和扎西康矿区土壤的黏粒矿物组成研究

The Soil Clay Mineral Association in Lawu and Zhaxikang Mine Regions,Tibet

采集西藏拉屋和扎西康两矿区代表性土壤样品,测定了土壤基本性状、黏土矿物和氧化铁含量。结果表明:拉屋矿区土壤呈酸性,扎西康矿区土壤呈碱性。拉屋矿区土壤有机质含量和CEC明显高于扎西康矿区的;两矿区的主要黏土矿物有水云母、高岭石、绿泥石、蛭石、1.4 nm过渡矿物和少量的混层矿物。拉屋矿区主要矿物是水云母和高岭石,扎西康矿区主要矿物是水云母;两矿区土壤的游离氧化铁均以晶形氧化铁为主,非晶形氧化铁所占比例很少。

Clay mineral compositions and physicochemical properties of soils in the mine regions of Lawu and Zhaxikang,Tibet were studied.The results indicated that the soils collected from Lawu are acidic while those from Zhaxikang were alkaline.Both the content of organic matter and the value of CEC in the soils from Lawu were much higher than those in the soils from Zhaxikang.Hydromica,kaolinite,vermiculite,chlorite,1.4 nm intergraded mineral and mixed-layer mineral could be found from both soils.But the soils from Lawu were predominated with hydromica and kaolinite while those from Zhaxikang were only dominated by hydromica.The iron oxides in both soils were mainly crystalline forms,with little part of amorphous species.