不同土壤重金属复合污染的有效态离子冲量表征

选择红壤、黄棕壤和潮土为对象,依据中国土壤环境质量二级和三级标准确定土壤重金属铜、锌、镉的污染浓度,通过生物盆裁试验研究在重金属Cu、Zn、Cd复合污染条件下牧草（黑麦草、紫花苜蓿）体内重金属含量和土壤中重金属有效态含量的相关性,结果表明,在3种不同性质的污染土壤上,牧草体内重金属的离子冲量与其对应土壤中重金属有效态的离子冲量之间均存在明显的相关性。校正土壤pH、牧草品种等因素后,土壤有效态离子冲量可以有效表征不同土壤-牧草系统的重金属复合污染。

Expression of heavy metals contamination by available ion impulse in different soils

The three typical soils including red soil, yellow brown soil and fluvo|aquic soil were tested with heavy metal (copper, zinc and cadmium) contaminations based on the Chinese Soil Environment Equality Standard. The correlation of heavy metals between the test herbages (ryegrass and alfalfa) and the soils were analyzed by pot experiments. There is evident correlation between the heavy metal ion impulse of the herbage and the available heavy metal ion impulse of the corresponded soil. And after correcting the difference of the soil pH and the kind of herbage, the available ion impulse of heavy metals of the soil is an appropriate method to evaluate the correlation of heavy metal concentrations between the herbages and the test soils simultaneously. ;