淹水条件下施加石灰和有机质对酸性土壤性质和磷吸附的影响
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EFFECTS OF LIME AND ORGANIC MATTER APPLICATION ON SOIL PROPERTIES AND PHOSPHOROS SORPTION BY SIX ACID SOILS UNDER FLOODED CONDITION
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    摘要:

    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0.5MCuCl2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CuCl2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。

    Abstract:

    Surface samples of five Ultisols (Dothan Red Bay, and Orangeburg from Florida, Manana from Hawaii, and Huangjinni from Zhejiang, China) and one Oxisols (Wahiawa from Hawaii) were used to ascertain the effects lime and organic matter on P adsorption and desorption under flooded condition. Reagent-grade calcium carbonate and ground dry clover tissues were used as lime and organic matter sources. Both lime and clover tissue addition increased soil pH and decreased Eh, but their effects on pH and Eh of the three Florida soils were less than that on other three soils. Flooding reduced the amounts of Al extracted by 0.5 M CuCl2. Lime and clover treatments further reduced it for the three Florida Ultisols, but the reverse was true for the other three soils. The amendments reduced the P adsorption for the three Florida soils and the order of reduction followed: clover tissues < lime < mixture of clover and lime. The effect was reverse for the other three soils. For the three Florida soils, additions of lime and clover tissues increased the P desorption; for the other three soils, the opposite was true. Phosphorus adsorbed by the flooded soils was significantly related with oxalate-extractbale Fe, Al, and Mn and CuCl2-extractbale Al, which suggests that the components controled P retention by flooded soils include not only pooly crystalline and amorphous Fe oxides and hydroxides, but also Al-OH polymer and Al bound with organic matter.

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孟赐福,袁嗣良.淹水条件下施加石灰和有机质对酸性土壤性质和磷吸附的影响[J].土壤学报,1988,25(2):146-155. Meng Cifu, Yuan T. L. EFFECTS OF LIME AND ORGANIC MATTER APPLICATION ON SOIL PROPERTIES AND PHOSPHOROS SORPTION BY SIX ACID SOILS UNDER FLOODED CONDITION[J]. Acta Pedologica Sinica,1988,25(2):146-155.

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  • 在线发布日期: 2013-02-25
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