【摘要】 本文主要研究了土壤中铁铝氧化物对白浆土的表层和白浆层的磷酸盐吸附与解吸的影响以及在吸附和解吸过程中无机磷的释放和形态转化机理。研究结果表明,铁铝氧化物对磷的吸附和解吸都有影响,其中无定形铝的影响更大一些,而且铁铝氧化物对吸附的影响程度超过有机质。磷被白浆土吸附后,火部分转变成铝磷(Al-P)和铁磷(Fe-P)。相对来说,铝对磷的吸附在快反应阶段强于慢反应阶段,铁则相反。把吸磷后的样品恒温静置,则Al-P逐渐向Fe-P和Ca-P转化。吸附磷解吸时,也是以Al-P为主。Fe-P是较好的“速效磷源”,而Al-P既是较好的“速效磷源”,也是很好的“缓效磷源”。更多还原

【Abstract】 The effects of sesquioxids in soils on phosphate(P) sorption and desorption, and the mechanisms of the release and change of inorganic P forms in surface and albic layers of albic soils, were studied in this papar. The results showed that Fe and Al oxides all affected adsorption and desorption of P in soils, of which Al did more strongly. The effect of organic matter on P sorption and desorption was checked by sesquioxdes. After P was adsorbed by soils, most of it changed into Al-P and Fe-P, of which Al-P was more. Thereafter Al-P gradually transformed into Fe-P. During fast reaction of P adsorption, Al had a higher affinity to P than Fe had, and the slow reaction was contrary to it. When P was desorbed from soils, Al-P contributed more to the amount of P desorbed than Fe-P did. Fe-P was a fairly good "rapidly available P resourc", and Al-P was a quite good both "rapidly available P resource" and "slowly available P resource".更多还原