水稻土的氧化还原过程及其与水稻生长的关系
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OXIDATION-REDUCTION PROCESSES IN PADDY SOILS AND THEIR RELATION TO THE GROWTH OF RICE
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    摘要:

    水稻土的主要特点是在一年之中有季节性的淹水和落干,而各种水稻土的干湿程度和时间都有不同,因而影响土壤性质发生复杂的变化。在这些性质中,氧化还原状况是变化最剧烈而指示最明显的性质,并且直接或间接影响水稻的生长。为此,作者等从1954年起,开始了这方面的研究工作,下面是关于几个主要简题的筒单概括。

    Abstract:

    A series of works carried out in the Laboratory of Soil Electro-chemistry of this Institute during the last ten years showed that the quantity factor (amount of the reducing compounds) and the intensity factor (redox potential) are of equal importance in characterizing the oxidation-reduction status of paddy soils in relation to its influences on soil properties and rice growth. The reducing compounds were estimated by potentiometric titration, chemical determination, and polarographic characterization. The redox potential of a given soil is determined primarily by the nature and amount of the organic reducing compounds, which are rather complex in composition and may range in half-wave potential from about 0.22V to 0.71V vs. calomel electrode under water-logged conditions. Owing to the reduction of ferric oxides by the organic reducing compounds, however, ferrous iron appears gradually and at the stage of transformation equilibrium ferrous iron may amount to 70-90% of the total reducing compounds. The ferrous iron exists in forms of free ions in solution, water-soluble chelates, exchangeable ions, chelates associated with the solid phase of the soil, and precipitates as sulfide and hydroxide.

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于天仁,刘志光.水稻土的氧化还原过程及其与水稻生长的关系[J].土壤学报,1964,12(4):380-389. Y&#; TIEN-JEN, LIU CHIH-KUANG. OXIDATION-REDUCTION PROCESSES IN PADDY SOILS AND THEIR RELATION TO THE GROWTH OF RICE[J]. Acta Pedologica Sinica,1964,12(4):380-389.

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  • 在线发布日期: 2013-02-25
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