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Impacts of n-alkane concentration on soil bacterial community structure and alkane monooxygenase genes abundance during bioremediation processes

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Frontiers of Environmental Science & Engineering 2018年第5期12卷 155-167页

作者： Yueqiao Liu Aizhong Ding Yujiao Sun Xuefeng Xia Dayi Zhang College of Water Sciences Beijing Normal UniversityBeijing 100875China School of Environment Tsinghua UniversityBeijing 100084China Lancaster Environment Centre Lancaster UniversityLancaster LA14YQUK

Petroleum hydrocarbons,mainly consisting of n-alkanes and polycyclic aromatic hydrocarbons(PAHs),are considered as priority pollutants and biohazards in the environment,eventually affecting the ecosystem and human *** many previous studies have investigated the change of bacterial community and alkane degraders during the degradation of petroleum hydrocarbons,there is still lack of understanding on the impacts of soil alkane contamination *** the present study,microcosms with different n-alkane contamination(1%,3%and 5%)were set up and our results indicated a complete alkane degradation after 30 and 50 days in 1%-and 3%-alkane treatments,*** all the treatments,alkanes with medium-chain length(C_(11)-C_(14))were preferentially degraded by soil microbes,followed by C27-alkane in 3%and 5%*** contamination level slightly altered soil bacterial community,and the main change was the presence and abundance of dominant alkane ***,Gemmataceae and Thermodesulfovibrionaceae were highly related to the degradation of C_(14)-and C_(27)-alkanes in 5%treatment,but linked to alkanes with medium-chain(C11-C18)in 1%treatment and C21-alkane in 3%treatment,***,we compared the abundance of three alkane-monooxygenase genes,e.g.,alk_A,alk_P and alk_*** abundance of alk_R gene was highest in soils,and alk_P gene was more correlated with alkane degradation efficiency,especially in 5%*** results suggested that alkane contamination level showed non-negligible effects on soil bacterial communities to some extents,and particularly shaped alkane degraders and degrading genes *** study provides a better understanding on the response of alkane degraders and bacterial communities to soil alkane concentrations,which affects their biodegradation process.

关键词： Petroleum hydrocarbon contaminated site n-alkane contamination level n-alkane biodegradation Soil bacterial community alkane degraders alkane-monooxygenase genes

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