外源Cd、Pb在薄层黑土中的形态分布及其对小白菜生长的影响  

Forms and Distribution of Exogenous Cd and Pb in Thin Layer of Black Soil and Their Effects on Pakehoi Growth

作　　者：慕姝[1] 何淼[1] 王卓[1] 张景野 刘淑霞[1] 

机构地区：[1]吉林农业大学资源与环境学院,长春130118 [2]吉林省扶余县三岔河镇农业站,吉林扶余131200

出　　处：《吉林农业科学》2010年第2期39-42,共4页Journal of　Jilin Agricultural Sciences

基　　金：吉林省教育厅"十一五"科学技术研究项目(200872)

摘　　要：通过盆栽试验,研究了外源镉、铅在土壤中的形态分布及其对小白菜生长的影响。结果表明:随着外源镉、铅浓度的增加,土壤中各形态的镉、铅均呈上升趋势。其中镉、铅均以交换态和碳酸盐结合态增幅较大,交换态、碳酸盐结合态镉、铅所占的百分比均呈现上升趋势;残渣态镉呈锐减趋势。外源镉浓度在0～2mg/kg时,小白菜的鲜重、叶长、干重都略有增加;当镉浓度达5 mg/kg时,小白菜的鲜重、叶长、干重开始下降,当镉浓度达20 mg/kg时与对照相比下降分别为27%、28%和21%。随着外源铅浓度的增加,小白菜的鲜重、叶长、干重在不断下降,当铅浓度达2 000 mg/kg时与对照相比下降分别为43%、38%和35%。Pot-cultured Pakehoi was used in this experiment to study forms and distribution of exogenous cadmium and lead in thin layer of black soil and their effects on pakehoi growth. The results showed that contents of all forms of cadmium and lead in soil increased with level of exogenous cadmium and lead. The lead and cadmium of exchangeable and Carbonate-bound form increased more than others. The proportion of lead and cadmium of exchangeable form and Carbonate-bound form increased as the added cadmium and lead increased, while cadmium of residual form reduced quickly. Fresh plant weight, leaf length and dry plant weight of pakehoi increased when the added cadmium was less than 2 mg/kg, and they reduced when the added lead was 5 mg/kg. When the added cadmium was 20 mg/kg, they reduced by 27%, 28% and 21% compared with the control. Fresh plant weight, leaf length and dry plant weight of pakehoi decreased as the exogenous lead increased. When the added lead was 2000 mg/kg, they reduced by 43%, 38% and 35% compared with the control.

关 键 词：薄层黑土 重金属 小白菜 生长 

分 类 号：Q945.78[生物学—植物学]