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

作　　者：WEICHAOFU XIEDETI 等 

机构地区：[1]CollegeofResourcesandEnvironment,SouthwestAgriculturalUniversity,CHongqing630716,China [2]CollegeofResou

出　　处：《Pedosphere》1996年第4期365-372,共8页土壤圈（英文版）

摘　　要：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.ＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＯｒｇａｎｏ－ＭｉｎｅｒａｌＣｏｍｐｌｅｘｉｎｇｏｆＭｉｃｒｏａｇｇｒｅｇａｔｅｓｉｎＰａｄｄｙＳｏｉｌｓＤｅｖｅｌｏｐｅｄｆｒｏｍＰｕｒｐｌｅＳｏｉｌｓＷＥＩＣＨＡＯＦＵ；ＸＩＥＤＥＴＩａｎｄＹＡＮＧＪＩＡＮＨＯＮ...

关 键 词：combined humus microaggregate organo-mineral complexing paddy soils from purple soils 

分 类 号：S155.42[农业科学—土壤学] S152.4[农业科学—农业基础科学]