耕作制对紫色水稻土铁锰铜锌形态的影响研究

EFFECTS OF CROPPING SYSTEMS ON THE MORPHOLOGICAL FEATURES OF IRON,MANGANESE,COPPER AND ZNIC IN PURPLE PADDY SOLL

本文研究了耕作制对紫色水稻土铁、锰、铜、锌的形态及其相互关系的影响。结果表明,稻田垄作(厢作)或水早轮作,土壤水溶态、代换态、易还原锰结合态、碳酸盐结合态,有机质结合态和二三氧化物(无定形铁铝)结合态铁、锰、铜的数量和比例均比对照有下降。残渣态(晶形矿物结合态)铁、锰、铜相对增多,即矿物固定增强;代换态和易还原锰结合态锌呈不同程度增加,二三氧化物结合态和有机质结合态显著下降。土壤铁、铜、锰的可结性下降,锌的可结性增加。有机质、易还原锰和无定形铁对土壤铁、锰、铜、锌具明显的吸附富集效应。

Compared with the traditional cropping system,ridge cropping or paddy-upland rota- tion resulted in a decrease in the contents of water soluble,exchangeable,reducible Mn-combined,carbonate-combined,organic matter-combined and amorphous Mn-combined Fe,Mn,and Cu in purple paddy soil,and in a relative increase in the re- mainders of these minerals.Consequently,the providibility of Fe,Mn and Cu dropped un- der the new cropping systems.On the other hand,exchangcable and reducible Mn-com- bined Zn increased in different degrees,thus improving the providibility of Zn in the soil. An adsorption-enrichment effect of organic matter,reducible Mn and amorphous Fe on Fe,Mn,Zn and Cu was observed in the soil.