施用污泥堆肥对土壤中Cu Zn形态分布的影响研究

Fractional Distribution of Copper and Zinc in a Soil Amended with Composted Sludge

采用小区试验区连续提取方法,研究了施用污泥堆肥后土壤中Cu,Zn的形态分布状况,影响因素,各形态之间的关系,以及在土壤中的累积。结果表明:①施用污泥堆肥后土壤中的Cu,Zn有效态含量和其他各形态含量均有所增加,且其增加程度随污泥堆肥施入量的增加而增加;②各处理土壤中Cu的各种形态的关系为:残渣态>铁锰氧化物结合态>有机结合态>可交换态>碳酸盐结合态,其中可交换态Cu对生物有效态Cu的贡献是主要的;土壤中的Cu大部分以不能被植物利用的残渣态形式存在;在Zn的各形态中残渣态占绝大部分,其次为铁锰氧化物结合态,碳酸盐结合态和有机结合态次之;③不同蔬菜地土壤中Cu,Zn的累积有很大差异。生菜地土壤中Cu的累积高于油菜地土壤,油菜地土壤中Zn的累积高于生菜地土壤。

An experiment was conducted to study the effects of application of sludge compost in rape and lettuce soils. The experiments site was located in the Water- Saving Irrigation Experimental Station in the Northwest Agriculture and Forestry Technology University, the sewage sludge was obtained from the north stone bridge dirty water handles factory in Xi'an City, and rape and lettuce were planted. The sequential extraction proceeding was applied to measure the distribution of Cu and Zn in soil fractions. Relationship between Zn and Cu fraction distribution, affecting factor, and the accumulation of Cu and Zn in the soil was also investigated. The result showed that: 1) the available contents and fraction contents in soils applied with sludge compost increased with the application of sludge compost, and the more the sludge compost applied, the more the contents increased. 2) the copper content orders in soil fractions was followed with: Res- Cu>MnO- Cu>OM- Cu>Exe- Cu>Car- Cu, and the exchangeable copper contributed most to the available content of copper, and the copper allocated mainly in residual fraction. Zinc distributed most in residual fraction, then in iron and manganese oxide fractions, and carbonate boned fractions and organic matter boned fractions followed. 3) the significant difference of accumulation amount of Cu and Zn in rape and lettuce soil was observed. The copper accumulated in the lettuce soil was higher than that in the rape soil, and the accumulation of Zn in the rape soil was higher than that in the lettuce soil.