Abstract：
The excessive accumulation of dibutyl phthalate (DBP) in soil poses a serious threat to soil ecosystems and crop safety production. Electrokinetic-assisted phytoremediation (EKPR) has been considered as a potential technology for remediating organic contaminated soils. In order to investigate the effect of different electric fields on removal efficiency of DBP, three kinds of electric fields were set up in this study (1 V·cm-1, 2 V·cm-1 and 3 V·cm-1). The results showed that 59 % of DBP in soil was removed by maize (Zea mays L.) within 20 d in low-intensity electric field (1 V·cm-1), and the accumulation of DBP in maize tissues decreased significantly compared to the non-electrified treatment group. Interestingly, it could be observed that the low-intensity electric field could maintain ion homeostasis and improve the photosynthetic efficiency of the plant, thereby relieving the inhibition of DBP on plant growth and increasing the chlorophyll content (94.1 %) of maize. However, the removal efficiency of DBP by maize decreased significantly under the medium-intensity (2 V·cm-1) and high-intensity electric field (3 V·cm-1). Moreover, the important roles of soil enzyme and rhizosphere bacterial community in low-electric field were also investigated and discussed. This study provided a new perspective for exploring the mechanism of removing DBP through EKPR.
摘要：
邻苯二甲酸二丁酯(DBP)在土壤中的过度积累对土壤生态系统和作物安全生产构成严重威胁。电动辅助植物修复（EKPR）已被认为是修复有机污染土壤的潜在技术。为了研究不同电场对DBP去除效果的影响,本研究建立了三种电场(1V·cm-1、2V·cm-1和3V·cm-1)。结果表明，在低强度电场（1V·cm-1）下，玉米（ZeamaysL.）在20d内去除土壤中59％的DBP，与非带电处理组相比，DBP在玉米组织中的积累明显减少。有趣的是,可以观察到，低强度电场可以维持离子稳态，提高植物的光合效率，从而减轻DBP对植物生长的抑制作用,提高玉米叶绿素含量(94.1%)。然而,在中等强度（2V·cm-1）和高强度电场（3V·cm-1）下，玉米对DBP的去除效率显着降低。此外，还研究和讨论了土壤酶和根际细菌群落在低电场中的重要作用。本研究为探索EKPR去除DBP的机制提供了新的视角。
