二滩水电站新垦土壤钾的固定及其有效性

对二滩水电站８种新垦土壤钾的固定和释放研究表明，新垦土壤全钾、有效钾（除园园土外）低，浸泡后大部分土壤有效钾含量提高，土壤对钾的固定量随钾平衡浓度的升高而升高，固定率随平衡浓度的升高而降低，其中，红壤，菜园土，水稻土钾含量高，土壤固钾能力弱，而漂灰土，荒地土，旱坡土，砂质新改土和重壤质新改土钾含量低，土壤固钾能力强，释放率反映土壤固定钾的活性，红壤，菜园土，水稻土固定钾的有效性高，而漂灰土，荒地上

POTASSIUM FIXATION AND AVAILABILITY IN NEWLY RECLAIMED SOILS AT ERTAN HYDROPOWER STATION

A study of K fixation and release in 8 newly reclaimed soils at Ertan Hydropower Station indicated that total K and available K were low in all the soils studied with the exception of vegetable growing soil and that available K increased in most soils after they were soaked in water for 4 days. K fixation by the soil increased and fixation rate decreased with increase in K balance consistency. Red soil, vegetable growing soil and paddy soil had high soil K, low K fixation power and high K fixation availability whereas bleached soil, waste land soil, sloping dry land soil, newly cultivated sandy soil and newly cultivated heavy loam soil had low soil K, high K fixation power and low K fixation availability. All the three adsorption models of Langmuir, Freundlich and Temkin equations were significantly correlated when used to fit the data of soil K fixation, and the Freundlich equation was shown to be the best.