桂西北矿区3种草本植物对铅镉胁迫的生理响应和综合评价

Studies on Physiology Responses to Lead and Cadmium Stress of Three Herbaceous Plants in Northwest Guangxi Mining Area

摘要:

为探讨矿区优势植物粽叶芦（Thysanolaena latifolia）、类芦（Neyraudia reynaudian）和芒草（Miscanthus sinensis）的抗重金属污染能力及生态恢复潜力，对生长在铅镉污染土壤中3种植物的生理指标和重金属含量进行了测定。结果表明，同一铅、镉污染水平下3种植物的过氧化物酶活性和脯氨酸含量为芒草>类芦>粽叶芦，丙二醛含量为芒草>粽叶芦>类芦；芒草中的铅、镉含量最高、富集系数最大。3种植物抗铅镉能力为芒草>类芦>粽叶芦，芒草对重金属污染的耐受性最强。因此，在矿区土壤植被恢复时，芒草可作为备选植物之一。

Abstract:

In order to explore the ability to resist heavy metal pollution and potential of ecological restoration of three herbage, such as Thysanolaena latifolia, Neyraudia reynaudiana and Miscanthus sinensis, their physiological indexes and heavy metal contents grown in lead-cadmium contaminated soil were measured. The results showed that POD activity and Pro content of three plants were in the order of M. sinensis > N. reynaudiana > T. latifolia under the same pollution level, while MDA content was M. sinensis > T. latifolia > N. reynaudiana. Lead (Pb) and cadmium (Cd) contents in M. sinensis were the highest among three species with the biggest bio-accumulating coefficient. The resistant capability to heavy metals was in the order of M. sinensis > N. reynaudiana > T. latifolia. Therefore, Miscanthus sinensis could be used as an alternative plant for vegetation restoration in mining areas.