双季稻复种轮作与连作对土壤有机质性状影响的研究  

A STUDY OF THE INFLUENCE OF DOUBLE-RICE MULTIPLE CROPPING ROTATION AND CONTINUOUS CROPPING ON THE PROPERTIES OF SOIL ORGANIC MATTER

作　　者：杨东方[1] 李学垣[1] 

机构地区：[1]华中农业大学土化系

出　　处：《中国农业科学》1990年第2期51-56,共6页Scientia Agricultura Sinica

基　　金：国家自然科学基金

摘　　要：本文比较了双季稻复和轮作与三种复种连作对土壤有机无机复合状况及腐殖质特性的影响。结果表明:双季稻复种轮作比油稻稻连作、麦稻稻连作和肥稻稻连作更能促进土壤有机质与矿质部分的复合。同时其紧结态腐殖质氧化稳定性强,能促进土壤形成稳定的团聚体,从E_4/E_6比值和胡敏酸红外光谱结果来看,复种轮作较三种连作下的土壤腐殖质的芳香性及缩合度提高,有利于土壤结构的改善。而肥稻稻连作能降低土壤、重组和粘粒的C/N比值,增加松结态腐殖质含量及其氧化性,在一定程度上,有利于土壤养分的释放与供给。The influence of double-rice multiple cropping rotation and three continuous croppings were compared on the status of soil organo-mineral complex and the properties of humus in this paper. The results show that the double-rice multiple cropping rotation is better in forming the soil complex of organic matter and minerals than any kind of the three continuous croppings (rape-rice-rice, wheat-rice-rice and green manure-rice-rice). Meanwhile, the oxidiziation of fixed humus under multiple cropping rotation is higher, therefore, the formation of stable aggregate in soil can be strengthened. With the view of E_4/E_6 ratio and IR spectral diagrams of humic acid, the aromatic nature of humus is higher under multiple cropping rotation. As for the continuous cropping of green manure-rice-rice, it manifests a drop of C/N ratios of soil, heavy fraction and clay, as well as an increase in loose form humus content and its oxidization, thus, both release and supply of soil nutrients could be improved to some extent.

关 键 词：双季稻 复种轮作 连作 有机质 

分 类 号：S511.420.6[农业科学—作物学]