Oxalic Acid Enhances Remediation of Cr Contaminated Soil in Leersia Hexandra Swartz

摘要

This study examined the effect of oxalic acid on phytoremediation of Cr contaminated soil in Cr-hyperaccumulator Leersia hexandra Swartz (L. hexandra). The effects of 0, 40, 80, 120 mmol kg~(-1) oxalic acid (OA) on biomass, Cr accumulation and translocation of L. hexandra and four kinds of enzymes in 200,400 mg L~(-1) Cr contaminated soil planted L. hexandra were studied. The results showed that above-ground biomass was maximumly increased by 48.25% under OA treatment and OA also enhanced the plant's ability to translocate Cr from roots to the harvestable aerial part which could contribute to phytoremediation. OA applied to soil planted L. hexandra with Cr stress maximumly increased dehydrogenase, sucrese, urease, peroxidase activities by 82.51%, 125.22%, 56.25%, 64.57% (p < 0.01). These results suggest that OA is an important amendment which can enhance the remediation capability and soil activity of Cr contaminated soil in L. hexandra.