酞酸酯在菹草根际环境中的消减及微生物作用机制  

On the dissipation of phthalatic acid esters and their microbial activities in the rhizosphere of Potamogeton crispus L.

作　　者：王爱丽[1] 

机构地区：[1]德州学院化学化工学院,山东德州253023

出　　处：《安全与环境学报》2013年第4期79-82,共4页Journal of Safety and Environment

摘　　要：以使用量最大的两种酞酸酯类化合物(PAEs)——酞酸二丁酯(DBP)和酞酸二异辛酯(DEHP)为目标污染物,模拟PAEs在菹草根际环境中的消减行为,并根据微生物量和群落结构的变化研究其消减机理。结果表明,对照组中菹草根际DBP和DEHP的消减率大于非根际;暴露组中菹草根际DBP的消减率与非根际没有显著性差异,根际DEHP的消减率小于非根际。暴露组和对照组中菹草根际微生物数量均大于非根际;对照组中菹草根际和非根际的微生物群落结构相似,而暴露组中菹草根际的微生物群落结构明显不同于非根际。这说明菹草根际PAEs的去除不仅与微生物量有关,还与微生物群落结构有关。与对照组相比,暴露使得菹草的根和茎叶对这两种PAEs的富集系数减小,表明污染严重的沉积物中PAEs的生物可利用性较小。The paper is to introduce our research results of the dissipation behavior of phthalic acid esters（PAEs） in the rhizosphere of Potamogeton crispus L.（P.crispus） via laboratory simulation,with its focus on the PAE dissipation mechanism according to the microbial biomass and community structure in the process of PAE dissipation.For our research purpose,we have chosen the dibutyl phthalate（DBP） and di-2-ethylhexyl phthalate（DEHP）,the two most important and abundant PAEs as the contamination targets.The results of our investigation show that the dissipation rate of DBP and DEHP in the rhizosphere of P.crispus proves higher than that in the non-rhizosphere in the control group.In comparison with the exposed group,the PAE dissipation rates of the rhizosphere and non-rhizosphere are different from that under the condition of the control group,exhibiting a lower dissipation rate in the P.crispus rhizosphere for DEHP and similar dissipation rate of DBP.The microbial biomass（i.e.total PLFA content） and the diversity index in the rhizosphere of P.crispus prove higher than those in the non-rhizosphere of the two groups（exposed group and control group）.However,minor difference with the microbial community structure in the control group can be found between the rhizosphere and the non-rhizosphere,whereas there exists significant difference in the exposed group.In addition,the PAE exposure proves to have a significant impact on the microbial community structure,especially,in the rhizosphere.This indicates that the PAE removal from the rhizosphere sediments of P.crispus is closely related not only with the microbial biomass but also with the microbial community structure,which suggests that the microbial community structure serves as the main factor affecting PAE biodegradation in the rhizosphere while the microbial biomass is of a great importance for the same microbial community structure.The bioconcentration factor（BCF） of DBP and DEHP in the roots and shoots of P.crispus in the exposed group prove

关 键 词：环境学 菹草 根际 酞酸酯 消减 

分 类 号：X131.2[环境科学与工程—环境科学]