ファイトレメディエーションへの利用を目指したケナフ(Hibiscus cannabinus L.)の鉛汚染土壌への順化の解析(2004年度神奈川大学総合理学研究所共同研究助成論文)

概要

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Seeds of kenaf(H.cannabinus) could germinate and grow in the soil polluted with 5310 ppm Pb, although their growth was strongly inhibited at first. After the expansion of the third and fourth leaves, older leaves died and fell, followed by the expanding new leaves. During the first 30 days, the numbers of leaves did not increase at a same rate as the control plants growing in soil without pollution. The numbers of leaves were only 9.0 after 30 days and the dry weight of the leaves and stems (upper ground biomass hereafter) was 0.26 g, which was 3.3% of the biomass of the control plants. After the first 30 days, the plants on the polluted soil did not lose their older leaves and began to increase the numbers of leaves. The plants then increased their upper ground biomass rapidly. The upper ground biomass was 59 g after 69 days, which was 32% of the control biomass. These results strongly suggest that seedlings of kenaf can tolerate and acclimate to soils highly polluted with Pb. Although their acclimations took a long period of time, 30 days, kenaf plants could grow normally after the acclimations. The concentrations of Pb in leaves, barks of stems and cores of stems measured by atomic absorption spectrometry were 0.204, 0.211 and 0.407 ppm, respectively. After the acclimations, kenaf accumulated Pb at concentrations lower than 1.0 ppm. Phytoremediation with kenaf is necessary to research acclimations.
神奈川大学の論文
2005-05-25