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铜、镉复合污染红壤对黑麦草生长和土壤酶活性的影响

Keywords: 重金属,黑麦草,石灰石,复合污染,生理指标

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Abstract:

采用石灰石调节红壤酸性后,利用对铜、镉具有一定耐性的高产牧草黑麦草修复铜、镉复合污染土壤。分析黑麦草的生长、生理生化指标以及土壤中酶活性的变化,探索在修复铜、镉复合污染红壤的同时又满足饲料作物安全种植的土地利用方式。结果表明,对于弱酸性红壤(pH6.0左右),土壤铜全量较低时(<50mg/kg),黑麦草的生物量、叶绿素含量、抗氧化酶活力、根系活力和丙二醛(MDA)含量与对照相比差异不大,可用于轻重金属污染土壤的修复。当铜含量较高时(200mg/kg),尽管黑麦草地上部减产不明显,但对黑麦草的生理指标已出现明显抑制作用,对铜镉的吸收系数明显增加。因此,不适宜在重污染土壤上种植黑麦草。土壤脲酶、过氧化物酶和蛋白酶活性能表征黑麦草-红壤体系中重金属的植物可利用性。

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