3种草本植物的抗旱性及重金属吸附能力研究

以香根草、马唐草和望江南三种植物为材料，研究干旱胁迫下3种草本植物的生理生化特性变化以确认其抗旱性，同时，研究3种草本植物的重金属吸附能力以确认其对矿区土壤重金属的修复效果。结果表明:3种植物的POD酶活性、可溶性蛋白含量和叶绿素含量均随胁迫时间延长而增加，SOD酶活性下降，而可溶性糖则表现出下降—升高—下降趋势，表明3种植物可通过协调SOD和POD活性降低氧化伤害，并通过调节可溶性蛋白和可溶性糖含量来维持植物的生理作用，保持叶绿素含量稳定，使植株正常生长；同时，3种草本植物对多种重金属均有较强的富集作用，在矿区种植3种草本植物能有效降低土壤重金属含量。3种植物具有良好的抗旱性及重金属富集能力，适合应用于于稀土矿区的生态修复。

Research on Drought Resistance and Uptake Capacity of Heavy Metals of Three Kinds of Herbaceous Plants

Three kinds of herbaceous plants such as Digitaria sanguinalis, Cassia occidentalis, Vetiveria zizanioides were tested, and the physiological and biochemical responses under drought stress were studied so as to confirm their resistance to drought, simultaneously, the heavy metal uptake capacities of plants were studied so as to confirm their restorative effects of heavy metals in rare earth mine area. The results showed that POD activity, soluble protein and chlorophyll contents of three kinds of herbaceous plants increased, SOD activity decreased, however, soluble sugar showed a fall—rise—fall trend, indicating that three kinds of herbaceous plants can reduce oxidative damage by coordinating the SOD and POD activity, maintain their physiological role and the stability of chlorophyll content by regulating the soluble protein and soluble sugar content so that the plants can grow normally. And three kinds of herbaceous plants showed the strong ability to enrich a variety of heavy metals. Heavy metal contents in rare earth mine area can be effectively reduced when three kinds of herbaceous plants are grown. The results indicated that three kinds of herbaceous plants showed the good drought resistance and enrichment capability of heavy metals, and were suitable for ecological restoration in rare earth mine area.