摘要
在实验室条件下，研究不同程度的外源重金属Cd胁迫对油菜土壤生物活性和酶活性的影响．结果表明：低浓度Cd对油菜土壤基础呼吸有一定的刺激作用．高浓度产生抑制作用，Cd浓度越高抑制作用越强．低浓度的Cd离子对油菜土壤硝化活性有一定增强作用，高浓度的Cd离子对油菜土壤硝化活性有抑制作用，Cd离子浓度越大，抑制作用越大．Cd离子对油菜土壤多酚氧化酶活性主要呈抑制作用，抑制强度和Cd离子的浓度关系不大．Cd离子的存在对油菜土壤过氧化氢酶略有刺激作用，刺激作用和Cd离子的浓度关系不大．低浓度Cd离子对油菜土壤脲酶、蔗糖酶有刺激作用，高浓度则有抑制作用．过低浓度和过高浓度的Cd离子对油菜土壤蛋白酶都有刺激作用，适宜的Cd离子浓度对油菜土壤蛋白酶有抑制作用．
This paper studies the influence of Cd^2＋ at different concentrations on the biological activities and the enzyme activities in cole soil under laboratory conditions. The results show that the effects of different concentrations of Cd^2＋ on soil biochemical process are significantly different. The soil basal respiration and nitrification are promoted by Cd^2＋ at lower concentrations while they are inhibited at higher concentrations. What＇s more, the higher the concentration of cadmium is applied, the more significant the inhibition to observed activities. The soil polyphenol oxidase activity is mainly inhibited by Cd^2＋ , and the inhibition has no relation with the concentration of cadmium. The soil catalase activity is promoted by Cd^2＋ , and the promotion has no relation with the concentration of cadmium. The soil urease activity and the soil sucrase activity are promoted by Cd^2＋ at lower concentrations, but they are inhibited at higher concentrations. The soil protease activity is promoted by Cd^2＋ at very high or very low concentrations, while it is inhibited at appropriate concentrations.
作者
俞芸芸
朱克寅
Yu Yunyun, Zhu Keyin （ College of Life Science, Shaoxing University, Shaoxing, Zhejiang, 312000）
出处
《绍兴文理学院学报（自然科学版）》
2006年第1期44-48,共5页
Journal of Shaoxing College of Arts and Sciences
关键词
镉污染
油菜土壤
生物活性
酶活性
cadmium
cole soil
biological activity
enzyme activity
