铜胁迫对油麦菜生长和土壤酶活性的影响

以油麦菜为试验材料,通过研究不同浓度铜胁迫(50,300,500,800,1200,2000mg/kg干土)对油麦菜幼苗生长和土壤酶(脲酶、转化酶、酸性磷酸酶、过氧化氢酶)活性的影响,探求表征土壤铜污染的主要指示酶,为铜污染土壤环境质量评价、有效利用等提供科学依据。在室内进行为期34天土培盆栽试验,测定了油麦菜幼苗生物量和土壤酶活,记录了整个试验过程中油麦菜叶片受伤率和成活率。结果表明:与对照相比,随着铜浓度的增加,油麦菜的叶片受伤率增加,成活率下降,油麦菜鲜重、株高、平均根长亦随Cu浓度升高而递减;土壤酶活性随着铜胁迫程度的增加而显著降低,其中脲酶、酸性磷酸酶活性降低最明显。相关分析结果表明,脲酶、转化酶、酸性磷酸酶、过氧化氢酶活性,油麦菜的平均根长、鲜重、株高与土壤铜含量存在着显著或极显著的负相关关系,酶活性与油麦菜的生理指标呈显著或极显著的正相关。可见土壤酶活性可作为检测土壤中重金属污染程度的参考指标之一。

Effect of Cu Stress on Lactuca sativa L. Growth and Soil Enzymes Activities

In order to study the effect of Cu stress on Lactuca sativa L.seedlings growth and four soil enzymes activities(urease,calatase,acid phosphatase and intertase),potential concentration(50,300,500,800,1200,2000 mg/kg dried soil)effects of Cu stress on Lactuca sativa L.seedlings growth indexes and red soil enzymes activities were investigated under field-simulated condition.The results showed that contrasted with control(native soil);increasing of Cu concentration resulted in higher leaves injury rate.With the...