Composition And Characterization Of Organo Mineral Complex In Ancient Paddy Soils

The main paddy soil oxidation reduction during soil frequent alternation,soil organic mineral complex is transformed,and there is a close relationship between stability and development the stage of clay organic mineral complex and paddy soil.This paper uses t he settlement method of sieving,X ray diffraction,scanning electron microscopy,infrared spectroscopy,nuclear magnetic resonance methods were analyzed,Liyang plain Shan site of Longgang ancient paddy soil organic mineral complex,the infrared spectral characteristics,mineral composition,morphology,element composition and the content of functional groups,a comparative study of the buried ancient paddy soil and modern farming paddy soil clay complex the clay mineral composition and element composition characteristics The main results are as follows:(1)Buried ancient paddy soil clay organic mineral complex content were 169.62-192.50g/kg,silt organic mineral complex content of 71.54-81.93g/kg,fine sand organic mineral complex content of 229.08-256.30g/kg,the content of organic mineral complex sand 56.59-70.87g/kg.Clay buried ancient paddy soil level(<2?m)content than modern farming in paddy soil organo-mineral complexes,Silt buried ancient paddy soil(2-20?m),sand(20-200?m),sand(>200?m)organo-mineral complex content less than modern farming in paddy soils.Organo-mineral complexes are sand with high content of organic-mineral complexes.(2)Buried ancient paddy soil clay complex mineral composition,mainly illite,kaolinite and vermiculite,kaolinite,but the soil mineral content differences.Kaolinite clay complexes buried ancient paddy soil content of 34.41%-43.89%,illite contents of 26.74%-42.5%,vermiculite is 21.03%-23.67%.Among them,kaolinite and illite content than modern farming rice soil layer for buried ancient paddy,but vermiculite containing buried ancient paddy soil than modern farming soil in rice.Two-layer kaolinite crystallinity high kaolinite crystallinity is superior compared to modern farming soil layer of buried ancient paddy soil.(3)Buried ancient paddy soil with modern farming rice soil clay complex element compositions consistent main o,Si,Al,Fe,are dominated by o element,but elements of the soil contents differ.Buried ancient paddy soil clay complexes as o content in 50.96%-57.44%,Si element content of 21.54%-23.06%,Al content to 10.95%-12.71%,3.29%-4.95% Fe element content.Among them,the buried ancient paddy soil clay complexes in Si,Al elements than modern farming soil in rice,but o,Fe element content of buried ancient paddy soil than modern farming soil in rice.(4)In the organic mineral complex of the PA profile,humic acid contains alkyl and carboxylic acid,and contains a small amount of carbonyl,aldehyde and ketone.Among them,the average alkyl content of the buried rice was 29.18%,the aryl group was 17.50%,the carboxyl group was 12.58%,and the carbonyl group was 0.41%.Compared with the modern cultivated paddy soil,the alkyl,aromatic and carboxylic acid content are higher than that of modern cultivated paddy soil,only the carboxyl group is less than the modern paddy soil.