长期施用有机肥料对紫色水稻土有机无机复合性状的影响

连续九年施用有机肥料，紫色水稻土壤及＜０．００２ｍｍ的有机无机复合体中无定形铁，铝和铬合态铁，铝的含量呈不同程度的增加，铬合态铁和铝间具拮抗作用（ｒ＝０．７９９８ｎ＝７）；土壤的有机质含量增加主要是由于轻组有机质含量增加，而有机无机复合度下降，土壤重组腐殖质的含量为０．２５－０．０１ｍｍ＞＜０．００２ｍｍ＞１－０．２５ｍｍ＞０．０１－０．００２ｍｍ；有机无机复合度及重组腐殖质中松结态与紧结态的比值

EFFECT OF LONG-TERM APPLICATION OF ORGANIC MANURES ON CHARACTERS OF ORGANO-MINERAL COMPLEX IN PURPLE PADDY SOIL

The contents of amporphous Fe and Al oxides and complexed Fe/Al oxides inereased to varying degrees in the soil and its organomineral complex under application of organic manures for 9 years, and there existed an antagonism between tomplexed Fe oxide and complexed Al oxide (r=0.7998^* n=7). The increase in the contents of soil organic matter was principally due to the increase in the contents of organic matter in light fraction, and degree of organo-mineral complexing in soil was decreased. The rate of loosely combined arid tightly combined humus in heavy fraction was comparatively increased. The sequence of organic matter in complexes was 0.25-0.01lmm> <0.002mm>1-0.25mm>0.01-0.002mm, and the degree of organo-mineral complexing and the rate of loosely combined and tightiy combined humus declined with the particle size and their average degrees of complexing were significantly lower than those in the soil. The content of Fe₂O₃ and the rate of Fe/C in soil loosely combined humus were higher, but the content of Al₂O₃ and the rate of Al/C were lower, and the contents of Fe₂O₃, and Al₂O₃, in humic acid were lower than those in fulvic acid. The sequence of contents of Fe₂O₃ and Al₂O₃ in loosely combined humus in complexes was consistent with that of the content of organic carbon.