植物间作下根际微生物和土壤酶与土壤多氯联苯(PCB)降解的关系
摘要
The effects of rhizosphere remediation on Polychorinated biphenyls (PCB) contaminated soil was studied through a pot-cultivation system with different combinations of three crops including ryegrass (Lolium perenne L.), pumpkin [Cucurbita moschata (Duch. ex Lam.) Duch. ex Poiret] and soybean (Glycine max (L.) Merr.). The results showed that: (1) Phosphatase and proteinase had an very significant positive influences on remediation rate of PCB in soil. It indicated that phosphatase and proteinase might be involved in the process of PCB's degradation. (2) The number of fungus also had an significant impact on the PCB elimination, but bacterium and actinomycete did not have significant effect. (3) The soil microorganisms played an important role in PCB's degradation. The removal of PCB from non-sterilized soil was higher than sterilized soil. (4) The root exudates could strengthen the PCB's degradation of microorganism. Regarding the removal of PCB from soil, the addition of root exudates from ryegrass and soybean were 21.4% and 24.9% higher than the control respectively.