中文摘要：

为探索植物修复技术的根际机理,采用根箱模拟试验,研究黑麦草根际环境对多氯代有机物污染的响应效应.结果表明,与对照处理相比,根际、近根际和远根际土壤中多氯代有机污染物含量变化情况各不相同;与黑麦草吸收特性相吻合,土壤中多氯代有机污染物有从非根际向根际环境迁移的趋势,土培期末的根际、近根际和远根际土壤中w（HCB）分别为0.313、0.219和0.207mg/kg,w（p,p＇-DDT）分别为0.351、0.230和0.221 mg/kg;黑麦草的地下部分对多氯代有机污染物的吸收利用程度均大于地上部分,吸收高峰期的植物地下和地上部分w（HCB）分别为0.716和0.078 mg/kg,w（p,p＇-DDT）分别为0.745和0.065 mg/kg;土壤微生物在很大程度上影响着黑麦草对多氯代有机污染物的吸收能力;在不同处理中,根际、近根际和远根际土壤的pH、w（有机质）和过氧化氢酶活性的变化情况各有差异,根际和近根际土壤环境理化性质的改变较大,而远根际土壤环境的改变相对较小.

英文摘要：

In order to investigate the mechanism of rhizosphere phytoremediation, the response of a Lolium multiflorum Lain. rhizosphere environment to polychloro-organic pollution （PCOPs） was investigated by modeling the soil-plant system in root-boxes. Compared with the control, the contents of PCOPs in the soil varied with distance from the Lolium multiflorum Lain. rhizosphere. The concentration variation of PCOPs in the soils was consistent with the absorption properties of the Lolium multiflorum Lam. to the PCOPs. The trend exhibited was that the PCOPs were transferred from the soils to the Lolium multiflorum Lain. rhizosphere environment soils. At the absorption peak period, the contents of HCB in the rhizosphere, near the rhizosphere and far from the rhizosphere were 0. 313, 0. 219 and 0. 207 mg/kg, respectively, and the contents of p,p＇-DDT were 0. 351, 0. 230 and 0. 221 mg/kg, respectively. The PCOPs absorption degree in the underground part of the Lolium multiflorum Lam. was significantly higher than that in the aboveground part. The microorganisms grown in the soils greatly influenced the absorption of PCOPs by Lolium multiflorum Lam. At the end of the pot experiment, the contents of HCB in the aboveground and underground parts of the plant were 0. 716 and 0. 078 mg/kg, respectively, and the contents ofp,p＇-DDT were 0. 745 and 0. 065 mg/kg, respectively. It was also concluded that the Lolium multiflorum Lam. could both absorb and degrade PCOPs in the soil environment. In the different treatments, the enzyme activity, pH and organic matter concentrations varied from each other. These variations were much more significant for soils in the Lolium multiflorum Lam. rhizosphere environment than for the soils far from the rhizosphere environment.