 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Comparative Growth and Distribution of Zn, Cd and Pb in Rice, Vetiver and Sunflower Grown in Contaminated Soils) ผู้เขียน: ดร.นวลฉวี รุ่งธนเกียรติ, ศาสตราจารย์ ,  สรัตนา เสนาะ สื่อสิ่งพิมพ์:pdf AbstractThe effect of soil heavy metal (Zn, Cd and Pb) concentration on the growth and concentration in the plant parts of rice, vetiver and sunflower was comparatively investigated in pot experiments. Each plant species was grown in soils contaminated with four levels of heavy metals, based on a completely randomized design with three replications. Vetiver plants were harvested at 120 d after planting. Rice and sunflower plants were harvested at the yield stage. The results indicated that heavy metal in the soil showed an adverse effect on plant growth performances especially in rice. On moderately and highly contaminated soils, rice could not produce seed, while leaf chlorosis was observed at the tillering stage. In general, the concentration of Zn, Cd and Pb in plant parts increased as the contamination levels in the soil increased and they accumulated more in the roots than in above-ground parts. However, the Cd concentration in sunflower seed was above the maximum level tolerated by livestock. The ability of plants to translocate heavy metals from the roots to the shoots as indicated by their transfer factor (TF) was in the order : (rice) (vetiver) (sunflower). Vetiver and sunflower could move Zn more than Cd and Pb. However, only sunflower had Zn TF values greater than 1 for all levels of contaminated soil. Therefore, sunflower was a promising plant for Zn decontamination. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Phytoextraction of Zinc, Cadmium and Lead from Contaminated Soil by Vetiver Grass) ผู้เขียน:ดร.นวลฉวี รุ่งธนเกียรติ, ศาสตราจารย์, สรัตนา เสนาะ สื่อสิ่งพิมพ์:pdf AbstractPhytoextraction of heavy metals is an environmental remediation method that uses plants to transport and accumulate the metals into harvestable growth. The ability of two vetiver ecotypes for phytoextraction of heavy metals (Zn, Cd and Pb) was studied using a 2 ? 4 factorial pot experiment in a completely randomized design with three replications. The two factors were the vetiver ecotype and heavy metal concentration level in the soil. The Ratchaburi vetiver ecotype (Chrysopogon nemoralis) and the Surat Thani vetiver ecotype (Chrysopogon zizanioides) were grown in contaminated soils with four levels of Zn, Cd and Pb. The results indicated that vetiver could grow well in the contaminated soil without any heavy metal toxicity symptoms. The Ratchaburi ecotype had a significantly better plant height and shoot dry weight than the Surat Thani ecotype. Vetiver plants grown in soil highly contaminated with heavy metals decreased in growth and accumulated more heavy metals. Two vetiver ecotypes gave different translocation factors of heavy metals. In general, vetiver accumulated more heavy metals in the roots than in the shoots. However, the Ratchaburi ecotype accumulated significantly more Zn in its shoots than roots, indicating its potential for use in the phytoextraction of Zn from contaminated soil. |
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