Pedosphere 6(4): 365--372, 1996
ISSN 1002-0160/CN 32-1315/P
©1996 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Characteristics of organo-mineral complexing of microaggregates in paddy soils developed from purple soils |
| WEI Chao-Fu, XIE De-Ti and YANG Jian-Hong |
| 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. Flesh 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. |
| Key Words: combined humus, microaggregate, organo-mineral complexing, paddy soils from purple soils |
| Citation: Wei, C. F., Xie, D. T. and Yang, J. H. 1996. Characteristics of organo-mineral complexing of microaggregates in paddy soils developed from purple soils. Pedosphere. 6(4): 365-372. |
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