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

作　　者：Yueqiao Liu Aizhong Ding Yujiao Sun Xuefeng Xia Dayi Zhang 

机构地区：[1]College of Water Sciences,Beijing Normal University,Beijing 100875,China [2]School of Environment,Tsinghua University,Beijing 100084,China [3]Lancaster Environment Centre,Lancaster University,Lancaster LA14YQ,UK

出　　处：《Frontiers of Environmental Science & Engineering》2018年第5期155-167,共13页环境科学与工程前沿（英文）

基　　金：supported by the National Scientific Foundation of China(No.41672227).

摘　　要：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 health.Though 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 level.In 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,respectively.In 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%treatments.Alkane contamination level slightly altered soil bacterial community,and the main change was the presence and abundance of dominant alkane degraders.Thermogemmatisporaceae,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,respectively.Additionally,we compared the abundance of three alkane-monooxygenase genes,e.g.,alk_A,alk_P and alk_R.The abundance of alk_R gene was highest in soils,and alk_P gene was more correlated with alkane degradation efficiency,especially in 5%treatment.Our 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 significantly.This 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 

分 类 号：S15[农业科学—土壤学]