Response of the ecological restoration plant Neyraudia reynaudiana for use in alleviation of heavy metal contamination

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Fuyao Chen

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Vegetation rehabilitation is one of the most cost-effective ways to realise heavy metal rehabilitation and comprehensive treatment in contaminated mine sites. Neyraudia reynaudiana was used as a slope restoration plant originally in many parts of China, but in the survey of mine waste sites in Sichuan province, China, we found that it accumulated more heavy metals than common landscape plants. In order to explore the possibility of using N. reynaudiana in ecological restoration, we hypothesised that by planting N. reynaudiana in soil with different concentrations of heavy metals (Cr, Cd, Pb) that the species could hyper-accumulate and ameliorate the contaminants. The results showed that heavy metals had inhibitory effects on plant height as the concentration increases. In order to cope with heavy metal stress, the activity of antioxidant enzymes of N. reynaudianachanges. We also found that the increase of heavy metal concentration in soil, increased the activity of plant-based enzymes, but when the concentration of heavy metals in soil exceeds 200 mg/kg, the activity decreased. N. reynaudiana is not a hyper-accumulative plant, but a high accumulation plant, and has value in use in slope stabilisation. The potential, multi-functional remediation opportunity presented by N. reynaudiana represents a good choice for phytoremediation projects.

Resource Type:
Audio/Video, Conference Presentation, SER2019

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Society for Ecological Restoration