摘要
连续九年施用有机肥料，紫色水稻土土壤及＜０．００２ｍｍ的有机无机复合体中无定形铁、铝和络合态铁、铝的含量呈不同程度的增加，络合态铁和铝间具拮抗作用（ｒ＝０．７９９８￣＊ｎ＝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＞＜０．００２１ｍｍ＞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随粒径的增大而下降，其平均复合度明显低于土壤，土壤中松结态腐殖质结合的铁的含量和Ｆｅ／Ｃ比值具有增加趋势，而铝的含量和Ａｌ／Ｃ比值恰相反；其中胡敏酸结合的铁铝含量比富里酸低；复合体中松结态腐殖质结合的铁铝含量与有机碳含量的顺序相一致。
The contents of amporphous Fe and Al oxides and complexed Fe、
Al oxides incr-eased to varying degrees in the soil and its organomineral complex under
applica-tion of organic manures for 9 years, and there existed an antagonism between
com-plexed Fe oxide and complexed Al oxide(r= 0.7998￣*,n=7).The increase inthe contents of
soil organic matter was principally due to the increase in the contentsof organic matter in light
fraction, and degree of organo-mineral complexing in soilwas decreased. The rate of loosely
combined and tightly combined humus in heavyfraction was comparatively increased. The
sequence of organic matter in complexeswas 0.25 0.01mm><0.002mm>1 0.25mm>0.01
0.002mm,and the degree oforgano-mineral complexing and the rate of loosely combined and
tightiy combined hu-mus declined with the particle size and their average degrees of
complexing weresignificantly lower than those in the soil. The content of Fe_2O_3 and the rate
of Fe/Cin soil loosely combined humus were higher, but the content of Al_2O_3 and the rateof
Al/C were lower,and the contents of Fe_2O_3 and Al_2O_3 in humic acid were lowerthan those
in fulvic acid.The sequence of contents of Fe_2O_3 and Al_2O_3 in looselycombined humus in
complexes was consistent with that of the content of organiccarbon.
出处
《土壤学报》
CAS
CSCD
北大核心
1995年第2期159-166,共8页
Acta Pedologica Sinica
关键词
紫色
水稻土
有机肥料
有机无机复合度
Purple paddy
soil,Organic manure,Degree of organo-mineialcomplexing,Fe and Al oxides,combined forms of
humus
