潮褐土镉锌复合污染对小白菜生长的影响

Effects of Cadmium and Zinc Compound Pollution on the Growth of Non-Heading Chinese Cabbage in Cinnamon Soil

采用盆栽的试验方法,运用正交设计,研究了潮褐土区域土壤重金属Cd、Zn复合污染对小白菜生长的影响.结果表明,重金属Cd单因素处理时,Cd的添加浓度在0～5mg·kg-1范围内时小白菜呈增产趋势,大于5mg·kg-1时呈减产趋势,浓度与产量极显著相关,相关系数为0.8804;潮褐土区域小白菜最大生长量时Cd添加浓度为1mg·kg-1.重金属Zn单因素处理时,Zn的添加浓度在0～760mg·kg-1范围内时小白菜呈增产趋势,大于760mg·kg-1时呈减产趋势,浓度与产量极显著相关,相关系数为0.9823;潮褐土区域小白菜最大生长量时Zn添加浓度为380mg·kg-1.随着Cd、Zn添加量的增大,小白菜吸收Cd、Zn的量呈极显著线性增大趋势.重金属Cd、Zn复合污染时,Zn对小白菜的产量影响极显著,Cd的影响不显著.Zn在低水平时与Cd对小白菜表现为协同增产作用;Zn在高水平时与Cd对小白菜表现为拮抗减产作用;添加Zn使小白菜对Cd的吸收和添加Cd使小白菜对Zn的吸收均表现出明显的抑制作用.

Pot experiment was conducted to study the effects of cadmium and zinc compound pollution on the growth of non-heading Chinese cabbage [Brassia campestris L.ssp.Chinensis (L.) Makino.Var.communis tsen et Lee] with full intersectant design in cinnamon soil.The results showed that the yield of non-heading Chinese cabbage increased with heavy metal cadmium treatment 0—5 mg·kg -1 but decreased with more than 5 mg·kg -1 .The correlation between concentration and yield was remarkable and the correlation coefficient was 0.880 4. The yield will be highest when added cadmium concentration was 1 mg·kg -1 under single cadmium treatment.The yield of non-heading Chinese cabbage increased with heavy metal zinc treatment 0—760 mg·kg -1 but decreased with more than 760 mg·kg -1 . The correlation between concentration and yield was remarkable and the correlation coefficient was 0.982 3. The yield will be highest with added zinc concentration 380 mg·kg -1 under single zinc treatment. The cadmium or zinc accumulation in non-heading Chinese cabbage evidently increased with the levels of added quantity. Under cadmium and zinc compound treatment, zinc observably impacted the yield of non-heading Chinese cabbage but cadmium function was not obvious. Zinc could cooperate with cadmium to improve the yield when the concentration of zinc was low. Zinc also counteracted cadmium to reduce the yield when the concentration of zinc was high. Adding zinc markedly restrained cadmium accumulation in non-heading Chinese cabbage and adding cadmium evidently restrained zinc accumulation in it.