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土壤圈(英文版). 1996, (04)

Characteristics of Organo-Mineral Complexing of Microaggregates in Paddy Soils Developed from Purple SoilsEnglish Full Text

WEI CHAOFU; XIE DETI and YANG JIANHONG (College of Resourcea and Environment, Southwest Agricultural University, Chongqing 650716 China)

Abstract: This paper deals with characteristics of organo-mineral complexing of microaggregates in the paddy soils developed from purple soils in Sichuan, China. Results show that the contents of organic matter in microaggregates are in the order of 1--0.25 mm ＞ smaller than 0.05 mm ＞ 0.05-0.25 mm. But the organic matter in 1-0.01 mm microaggregates accounts for 68.1%-78.7% of that in soil. The organic matter in＜0.05 mm microaggregates is complexed humus on the whole, of which the degree of organo-mineral complexing varies between 96.1% and 99.5%, which is higher than that of the soil or＞0.05 mm microaggregates. The contents of loosely combined humus and the ratios of loosely and tightly combined humus markedly decline with the size of microaggregates. Fresh soil humus formed from semi-decomposed organic material or organic manure added is combined first with＜0.001 mm clay, and then aggregated with other organic and mineral particles to form larger microaggregates, in which the aging of humus happens at the same time; whereas organic matter of the light fraction is mainly involved in the formation of＞0.05 mm microaggregates.
Keywords：

combined humus; microaggregate; organo-mineral complexing; paddy soils from purple soils;

  • Series：

    (D) Agriculture

  • Subject：

    Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S153.6

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