施氮对长沙地区两种水稻土铝及盐基离子溶出的影响

Effects of Applications of N-Fertilizers on Release of Al and Base Cations from Two Rice Paddy Soils in Changsha

分别用碳酸氢铵和尿素溶液对长沙地区两种水稻土进行连续浸提试验 ,研究氮肥施用对水稻土中 Al及盐基离子溶出的影响 .结果表明 ,随着含氮浸提液体积或浸提次数增加 ,土壤中 Al的溶出总量、盐基离子的溶出量均随之增加 .在红黄泥或紫砂泥中 ,Al及盐基离子溶出总量随碳铵浓度递增而增加 ,而随尿素浓度变化规律不很明显 ,表明碳铵或尿素对红黄泥和紫砂泥中土壤 Al及盐基离子的溶出均有促进作用 .对土壤溶液 Al与 (Ca+ Mg)的量比的分析表明 ,在红黄泥上碳铵或尿素的不合理施用可能诱发轻微的

Effects of application of N fertilizers on the release of Al and base cations from two rice paddy soils in Changsha were studied through a batch experiment with NH 4HCO 3 and CO(NH 2) 2 solution respectively. The results show that the amount of the release of Al and base cations from soil increases with the increase of both the volume of N fertilizer applied and the times of digestion.In reddish earth and purple sandy earth,the release of Al and base cations increases with the rise of concentration of NH 4HCO 3, but the effects of CO(NH 2) 2 concentrations on soil base cations are not obvious, meaning that the applied NH 4HCO 3 or CO(NH 2) 2 promotes the release of Al and base cations. From the aspect of Al/(Ca+Mg)molar ratios in soil solutions, unreasonable applications of NH 4HCO 3 or CO(NH 2) 2 in reddish earth probably lead to slight intoxication of Al.