Effects of different treatments on soil borne DDT and HCH dynamics and plant uptake英文电子书.pdf

Journal of Environmental Science and Health, Part B (2011) 46, 608–614 Copyright C Taylor Francis Group, LLC ISSN: 0360-1234 (Print); 1532-4109 (Online) DOI: 10.10802011.589313 Effects of different treatments on soil-borne DDT and HCH dynamics and plant uptake HUASHOU LI1,2, WEIFENG LING1 and CHUXIA LIN3 1Institute of Tropical and Subtropical Ecology, South China Agricultural University, Guangzhou, China 2Key Laboratory of Ecological Agriculture, China Ministry of Agriculture, South China Agricultural University, Guangzhou, China 3Australian Centre for Sustainable Catchments, University of Southern Queensland, Toowoomba QLD, Australia 4 1 0 2 y r a u r b Pot experiments were conducted to examine the effects of various fertilizers, as well as soil dilution treatments on the dy- e F namics of soil-borne DDTs [sum of dichlorodiphenyltrichloroethane (DDT), chlorodiphenyldichloroethylene (DDE) and di- 6 2 chlorodiphenyldichloroethane (DDD)] and hexachlorocyclohexanes (HCHs, sum of α-HCH, β-HCH, γ -HCH and δ-HCH) and 8 their subsequent impacts on the uptake of DDTs and HCHs by a test plant. The results show that the soil residual DDTs and 2 : 6 HCHs concentrations in the iron-rich fertilizer-treated soil were significantly lower than those in other fertilizer-treated soils. There 0 t was a close relationship between the soil residual DDTs and the plant tissue DDTs. This suggests that the uptake rate of DDTs by a ] the plant was dependent on the concentration of soil-borne DDTs. A less close relationship between soil residual HCHs and plant y t i tissue HCHs was also observed. Dilution of pesticide-contaminated soil with the non-contaminated soil not only physically reduced s r e