| 旱地和淹水土壤中DDT的降解及DDMU和DDMS的形成趋势 |
| 摘要点击 1523 全文点击 1375 投稿时间：2007-01-12 修订日期：2007-03-12 |
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| 中文关键词 形成动态；DDMS DDMU 旱地；淹水土壤 |
| 英文关键词 dynamics DDMS DDMU dry soil submergic soil |
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| 中文摘要 |
| 在水稻和黑麦草2种栽培条件下，研究了新施入土壤中的工业DDT及微量老化残留DDT的降解，以及二级降解物DDMS和DDMU的形成动态.结果表明，DDT在旱地土壤中降解缓慢，其一级降解物DDE和DDD检出量略有增加，二级降解物DDMU和DDMS的形成极为有限，到试验终止时(黑麦草生长128 d)二者检出量仅为20 ng·g-1.DDT在淹水土壤中可迅速降解，84 d后DDT残留量仅为施入量的2％左右，维持在70～80 ng·g-1的水平；随DDT的降解，其一级降解物DDD检出量增加，在第84 d达峰值，DDD检出量的峰值与DDT的谷值时间基本吻合；同时DDMS和DDMU检出量也明显增加，在84 d时达到峰值，分别为28和115 ng·g-1.未发现不同土壤条件对微量老化残留DDT降解动态或降解物形成产生影响.因此，淹水条件极利于新施入DDT在土壤中的降解并形成DDMS，但不能通过改变土壤水分条件来促进老化残留DDT降解. |
| 英文摘要 |
| Dynamics of DDMS and DDMU in soils with DDT application under rice and ryegrass planting by pot experiment in greenhouse was conducted. Results show that DDE/DDD is slightly increased, and only about 20 ng·g-1 DDMU or DDMS could be found in ryegrass soil at the end of the experiment. However, the DDD, DDMS and DDMU are formed very rapidly in rice soil. By the 84th day of the experiment of rice planting, DDT residue is 70～80 ng·g-1, about 2% of the concentration added at the first of the experiment, meanwhile, concentrations of DDD, DDMS and DDMU are increased to the highest level. Concentration of DDMS and DDMU is detected at 28 and 115 ng·g-1 respectively. On the other hand, above phenomena are not observed in the aged DDT of soils, which implies that submerging could increase degradation of DDT added newly to DDD and DDMS/DDMU, but not for the aged DDT of soils. |
