Degradation of TCP in soil planted with alfalfa（Medicago sativa L.） | TCP在种植苜蓿土壤中的降解研究
2010
Ding Keqiang, Nanjing Institute of Technology, Nanjing（China）, Department of Environmental Engineering
[Objective] The research aimed to study the degradation of 2, 4, 6-trichlorophenol (TCP) in soil planted with alfalfa (Medicago sativa L.), as well as to provide references for the Chlorophenols phytoremediation technology in the practical application. [Method] By the use of pot culture experiment in greenhouse, the phytoremediation effect of alfalfa on TCP-contaminated soil, the growth conditions of alfalfa, as well as the effect of TCP on the activity of soil polyphenol oxidase, dehydrogenase and catalase were studied. [Result] After the alfalfa was grown for 75 d, the TCP content in soil of three different concentrations treatments (low, middle and high) decreased dramatically within 15 d, and then the decreasing rate was gradually slow; on the 30th d of cultivation, the fresh weight of treated alfalfa showed no significant difference with the control (P0.05), indicating that TCP in soil had inhibition effect on the growth of alfalfa; alfalfa could significantly enhance the activities of polyphenol oxidase, dehydrogenase and catalase, thus raising the degradation capability of soil plants and microorganisms on pollutants in soil. [Conclusion] There results indicated that alfalfa could enhance the degradation rate of organics in the contaminated soil and enhance soil enzyme activity, so the alfalfa could be used for the bioremediation of TCP contaminated soil.
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