【摘要】 采用土柱模拟试验研究了水稻土淹水过程中不同土层铁形态的变化及对磷吸附、解吸特性的影响 .结果表明 ,淹水使土壤中结晶态氧化铁含量减少 ,同时使无定形氧化铁大大增加 ,土壤对磷的吸附能力大为提高 ,磷最大吸附量增大 ,磷解吸率降低 ,从而影响水稻土中磷的有效性 .淹水土壤还原层铁形态和磷吸附、解吸的变化比氧化层更为剧烈 ,尤其是红壤性水稻土 ,在青紫泥中两土层间的差异不明显更多还原

【Abstract】 A soil column simulated experiment was carried out to estimate the effect of flooding on iron transformation and phosphorus adsorption desorption properties in different layers of the paddy soils The results showed that the content of amorphous Fe oxides of the soils increased significantly with the decreasing of crystalline Fe oxides content during the flooding process, and the maximum capacity of P adsorption increased remarkably, while desorbed P/adsorbed P ratio decreased More notable changes of Fe forms and phosphorus adsorption and desorption properties were observed in the reduced layer of Ultisol, compared with those in the oxidized layer But there was no significant difference between the two layers in Entisol更多还原