黑麦草对土壤中Cd不同赋存形态的吸收规律

通过在3种典型土壤中种植黑麦草的盆栽实验,研究了黑麦草吸收镉量和土壤中镉负荷及土壤镉赋存形态的相关关系。结果表明,随着镉负荷增加,黑麦草吸收镉量明显增加。在3种土壤中黑麦草吸收镉量大小顺序为:红壤>黄棕壤>潮土。黑麦草吸收镉量除受镉负荷影响外,与镉在土壤中的形态分布密切相关,黑麦草吸收的镉主要是土壤中的交换态镉和松结有机态镉。

Adsorption of Different Chemical Forms of Cd in Soil by Ryegrass

Through pot experiments of ryegrass grown in three soils, a correlation between the amounts of Cd accumulated by ryegrass and the chemical form distribution in the studied soil was analyzed. The results showed that the amounts of Cd accumulated by ryegrass were positively related with the loads of Cd in the soils studied. The order of the amounts of Cd accumulated by ryegrass in three soils were in an order: red earth>yellow- brown earth>fluvo- aquic soil. Exception of Cd in soils, the amount of Cd accumulated by ryegrass was related with the chemical form distribution in the studied soils. The main forms of Cd accumulated by ryegrass consisted of exchangeable fraction and organic complex fraction.