植物修复芒草——一种原位修复铬污染土壤的方法。
Phytoremediation potential of paragrass--an in situ approach for chromium contaminated soil.
机构信息
Laboratory of Environmental Physiology, Post Graduate Department of Botany, Utkal University, Bhubaneswar, Orissa, India.
出版信息
Int J Phytoremediation. 2012 Sep;14(8):796-805. doi: 10.1080/15226514.2011.619595.
The present in situ phytoextraction approach uses paragrass (Brachiaria mutica (Forssk) Stapf) as a hyper accumulator for attenuation of chromium level in soil and mine waste water at South Kaliapani chromite mine area of Orissa. The bioconcentration factor (BCF) for Cr was maximum (0.334) in 100 days grown paragrass weeds. Transportation index (Ti) i.e. 6.16 and total accumulation rate (TAR) i.e. 8.2 mg kg(-1)day(-1) was maximum in 125 days old paragrass grown in Cr contaminated experimental cultivated plots. Cr bioaccumulation in roots was nearly 1000 times more than shoots. Paragrass showed luxuriant growth with massive fibrous roots when grown over Cr contaminated soils (11,170 mg/ kg dry soil). Cr bioaccumulation varies significantly with plant age, biomass and level of Cr contamination in irrigated mine waste water and soil. Paragrass could be used as hyperaccumulators as it showed rapid massive growth with a high tolerance to Cr.
目前的原位植物提取方法使用象草（Brachiaria mutica（Forssk）Stapf）作为超积累物，以降低奥里萨邦南卡利亚潘尼铬矿区土壤和矿山废水中的铬含量。在 100 天生长的象草杂草中，Cr 的生物浓缩系数（BCF）最高（0.334）。在 125 天龄的 Cr 污染实验种植区生长的象草中，运输指数（Ti）即 6.16 和总积累率（TAR）即 8.2 mg kg(-1)day(-1)最高。Cr 在根部的生物积累量比在地上部高出近 1000 倍。当在 Cr 污染土壤（11,170 mg/kg 干土）上生长时，象草表现出旺盛的生长和大量的纤维状根。Cr 的生物积累量随植物年龄、生物量和灌溉矿山废水中及土壤中 Cr 污染水平的变化而显著变化。象草可作为超积累物，因为它表现出对 Cr 的快速大量生长和高耐受性。
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