武当山土壤的粘粒矿物与表面电荷性质

本文研究了湖北省武当山风景区石英云母片岩发育的７个土样的粘土矿物组成、粘粒氧化物含量。土壤电荷量及电荷零点．结果表明：（１）供试土壤粘土矿物均以２∶１型矿物占优势，在海拔４４０ｍ以下的土壤中主要是水云母和蛭石，在海拔６７０ｍ以上的土壤中主要是１．４ｎｍ过渡矿物、绿泥石和水云母；（２）土液粘粘中氧化铁和氧化铝的含量、粘粒硅铝率及氧化铁的游离度随海拔的变化而变化的趋势不甚明显，但非晶形铝铁氧化物的含量及氧化铝和铁的活化度随海拔升高而趋于增加；（３）土壤可变负电荷量、阴离子吸附量和电荷零点随海拔升高而趋于增加。

Clay mineral Compoaition and Surface Charge Properties of Soils in Wudang Mountain

Clay mineral composition contents of Fe, Al and Si oxides in clay fraction, charge amounts and Point of zero change (PZC) of seven soil samples, derived from quartz mica schist and collected from different altitudes of Wudang Mountains, were studied. Results indicate that, (1) the clay mineral composition of the examined soils is predominated with 2:1 type minerals, and below the ahitude of 440m with hydromica and vermiculite, but above the altitude of 670m ash 1.4 nm intergrade mineral, chlorite and hydromica (2)There is no significant changing tendency in the contents of Al and Fe oxides, the silica-alumica ratio, and the freedom of Fe oxides in the clay fraction with the changing altitudes, but the contents of noncrystalline Al and Fe oxides, and the activity of Al and Fe oxides tend to increase with the increase in altitude. (3) The variable charge amount, the anion adsorption amount and the PZC values of the soils tend to increase with the increase in altitude.