本研究係以配製3種不同濃度的戴奧辛污染土壤，並選用大花咸豐草、海雀稗及白竹仔菜進行盆栽試驗，於溫室栽種8星期後，觀測戴奧辛毒性對植物生長的影響及植物體內吸收與分布的情形，以評估植生復育處理受戴奧辛污染之土壤可行性。研究結果顯示在低濃度PCDD/Fs下，大花咸豐草、海雀稗及白竹仔菜的生長未受毒性影響，但中、高濃度的PCDD/Fs會對於植物生長高度產生明顯的抑制現象，部分植物甚至發生黃化及枯死的現象。三種植物體的PCDD/Fs濃度分析結果顯示，根部所吸收的PCDD/Fs濃度明顯大於地上部的PCDD/Fs濃度，其中以大花咸豐草根部可吸收濃度最高，根部生物累積因子值可達1.21，顯示大花咸豐草適用於植物穩定化，可避免土壤中PCDD/Fs的擴散。

The potential of three herb species Bidens pilosa var radiata, Paspalum vaginatum Sw and Commelina diffusa Burm f in the phytoremediation of PCDD/Fs contaminated soil was evaluated. All species could grow well under the low PCDD/Fs concentration after 8 weeks in the greenhouse. Increasing concentration of PCDD/Fs, phytotoxicity would clearly cause suppression effect on the plants. The PCDD/Fs could be uptake into the root but it can not hardly be translocate to the shoot. BAFs value is 1.21 for the root of B. pilosa var. radiat. These results indicate that B. pilosa var radiata can be applied to minimize the spread of contamintants on the remediation site.