The Effect of Plant Growth-promoting Rhizobaceria on Phytoremediation of Cadmium Contaminated Soils

• Main Authors: Yu-Shan Tseng, 曾于珊
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/84712234067353502666

碩士 === 國立雲林科技大學 === 環境與安全工程系碩士班 === 94 === This study aimed to investigate the treatment of cadmium contaminated soils by phytoremediation. The experiment was conducted with the addition of microorganism, which can help the growth of plants, to roots of a plant to increase its ability to remove heavy metal in soils , and to acceculate the remediation. In addition, by a way of 2×2 , soils with/without plants cropped, and roots of a plant with/without microorganism added, were grouped and compared as well. Then sequential chemical extractions(SCE) and 0.1N HCl extractions were used to analyze cadmium''s density in soil , changes of its form, and changes of bacteria communities. The result had shown that cadmium with differernt density in soil all decreased along with the longer time of planting. The same result was found by both SCE and 0.1N HCl extractions; howewver, the significant differences of removal percentage were definitely indicated. Compared to 0.1N HCl extractions, only 13.82~10.72% of removal percentage by SCE was as few as 2-3 times. During the experiment, the forms of cadmium were both exchangeable and Fe-Mn oxide bound at first; then, most of them were mainly Fe-Mn oxide bound. In this study, goosegrass was used as a subejct , and proved to be able to remove heavy metal effectively. Therefore, the addition of microorganism is most likely to enhance plants'' ability to remove heavy metal in soils.