文献类型：期刊文献

英文题名：Di-2-ethylhexyl phthalate (DEHP) degradation and microbial community change in mangrove rhizosphere gradients

作者：Chen, Yijie[1];Zhen, Zhen[1];Li, Gaoyang[1];Li, Huijun[1];Wei, Ting[1];Huang, Fengcheng[1];Li, Tao[1];Yang, Changhong[1];Ren, Lei[1];Liang, Yanqiu[2];Lin, Zhong[1,3];Zhang, Dayi[4,5]

机构：[1]Guangdong Ocean Univ, Coll Coastal Agr Sci, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Fac Chem & Environm Sci, Zhanjiang 524088, Peoples R China;[3]Guangdong Ocean Univ, Shenzhen Res Inst, Shenzhen 518108, Peoples R China;[4]Jilin Univ, Coll New Energy & Environm, Changchun 130021, Peoples R China;[5]Jilin Univ, Minist Educ, Key Lab Groundwater Resources & Environm, Changchun 130012, Peoples R China

年份：2023

卷号：871

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：SCI-EXPANDED(收录号：WOS:000943023100001)、、EI(收录号：20230813601314)、Scopus(收录号：2-s2.0-85148075801)、WOS

基金：This work was financially supported by the National Natural Science Foundation of China (41977125, 41907033, 41907346 and 31800109) , Natural Science Foundation of Guangdong Province (2022A1515010867, 2022A1515010630 and 2019A1515011948) . DZ also acknowledges the support of the Chinese Government's Thousand Talents Plan for Young Professionals.

语种：英文

外文关键词：Phthalate acid ester; Sediment; Mangrove; Rhizosphere; Microbial community

外文摘要：Di-2-ethylhexyl phthalate (DEHP) is a widespread persistent organic pollutant in the environment. As an ultimate bar-rier preventing pollutant entry into the ocean, mangrove plays an important role in coastal ecosystem. However, little information is known about DEHP degradation in mangrove rhizosphere. In this study, a rhizobox was used to separate four consecutive rhizosphere compartments with distance of 0-2, 2-4, 4-6, and > 6 mm to the rhizoplane of Kandelia obovata and investigate DEHP gradient degradation behavior in rhizosphere. Sediments closer to the rhizoplane exhib-ited higher DEHP degradation efficiencies (74.4 % in 0-2 mm layer). More precisely, mangrove rhizosphere promoted the benzoic acid pathway and non-selectively accelerated the production of mono(2-ethylhexyl) phthalate, phthalic acid and benzoic acid. Higher sediment organic matter content, lower pH and less humus in rhizosphere benefited DEHP hydrolysis. In addition, rhizosphere significantly increased microbial biomass and activities comparing to bulk sediments. Some bacterial lineages with potential DEHP degradation capability exhibited a distance-dependent pattern that decreased with the distance to the rhizoplane, including Bacillales, Acidothermaceae, Gammaproteobacteria, and Sphingobacteriales. Our findings suggested that mangrove rhizosphere could accelerate DEHP degradation by alter-ing sediment physicochemical properties and microbial composition, showing positive effects on coastal ecosystem services for eliminating phthalate acid ester contamination.