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每公斤土加入2克碳酸钙和(或)三叶草的5个老成土和1个氧化土,在淹水培育45天后风干,结果发现:(1)淹水土壤风干,其pH比淹水时低,但仍比未淹水的高;(2)淹水降低了土壤中0.5MCuCl_2提取的铝量,石灰和三叶草处理使3个轻质土中的铝量进一步降低,但3个粘质土则呈现相反的趋势;(3)改良剂使3个轻质土吸附的磷减少,而使3个粘质土吸附的磷增加。前者增加的原因是因为通过还原作用和氧化作用形成了较多的活性表面,而后者的减少则可能是粘粒表面所形成的水化氧化物胶膜堵塞了原有的吸附位,从而使吸附位减少(4)改良剂对磷解吸的影响,是降低了3个轻质土的磷解吸,而增加了3个粘质土的磷解吸;(5)经淹水风干处理土壤的磷吸附量与草酸盐提取的铁、铝、锰及CuCl_2溶液提取的铝有很高的相关性,表明控制淹水土壤磷吸持的土壤组分,不仅包括无定形铁,而且也包括羟基铝聚合物。
Five kilograms of calcareous soil and one clover per hectare of soil were added with 2 g of calcium carbonate and / or clover and air-dried for 45 days after flooding. The results showed that: (1) The flooded soil was air-dried and its pH was lower than that of flooded soil , But still higher than that of non-flooded water; (2) flooding reduced the amount of aluminum extracted by 0.5MCuCl_2 in the soil, lime and clover treatments further reduced the amount of aluminum in the three light soils, but the three clay (3) The improver reduced the phosphorus adsorbed by the three light soils and increased the phosphorus adsorbed by the three clay soils. The reason for the former increase is that more active surfaces are formed through reduction and oxidation, while the latter decrease may be caused by blocking of the original adsorption sites by the hydrated oxide film formed on the surface of the clay particles, so that the adsorption (4) The effect of modifier on the desorption of phosphorus was to reduce the desorption of phosphorus by three light soils, but to increase the desorption of phosphorus by three clay soils. (5) It is highly correlated with the aluminum extracted by oxalate, iron extracted by iron, aluminum, manganese and CuCl 2 solution, indicating that the soil components controlling phosphorus adsorption in flooded soil not only include amorphous iron, but also aluminum hydroxyapatite .