Effect of dissolved oxygen on methane production from bottom sediment in a eutrophic stratified lake  

作　　者：Yasuyuki Maruya Keisuke Nakayama Masafumi Sasaki Katsuaki Komai 

机构地区：[1]Graduate School of Engineering,Kyushu University,744 Motooka,Nishi-Ku,Fukuoka 819-0395,Japan [2]Graduate School of Engineering,Kobe University,Rokkodai-Cho 1-1,Nada-Ku,Kobe 657-8501,Japan [3]Department of Engineering,Kitami Institute of Technology,Kohen-Cho 165,Kitami 090-8507,Japan

出　　处：《Journal of Environmental Sciences》2023年第3期61-72,共12页环境科学学报（英文版）

基　　金：supported by JSPS KAKENHI grant numbers JP26420491, JP14J03382, JP18KK0119, JP18H01545, JP18K13835, and JP21H05178。

摘　　要：Clarifying the role of sulfate and dissolved oxygen (DO) in methane production may allow for precise and accurate modeling of methane emissions in eutrophic lakes.We conducted field observations of sulfate,methane,and DO concentrations in Lake Abashiri,a typical brackish and eutrophic lake in a cold region,to develop a DO-based method for quantitively estimating methane production in a eutrophic lake and analyzed the results.We found that sulfate concentrations decreased rapidly from 900.0 mg/L in water overlying the sediments to nearly 0.0 mg/L in the bottom sediment.Methane production was almost uniform across sediment depths of 0.05 to 0.25 m,ranging from 1400 to 1800μmol/m^(2)/day.Also,methane production was found to be a function of DO concentrations in water overlying the bottom and could be modeled by a logistic function:constant production at 1,400μmol/m^(2)/day for DO concentrations of 0.0 to 3.0 mg/L,rapidly decreasing to 0μmol/m^(2)/day for DO concentrations of 3.0 to 6.0 mg/L.This methane model was verified using a simple one-dimensional numerical model that showed good agreement with field observations.Our results thus suggest that the proposed methane model reduces uncertainty in estimating methane production in a eutrophic lake.

关 键 词：Dissolved oxygen(DO) STRATIFICATION METHANE ANOXIA Numerical simulation 

分 类 号：X524[环境科学与工程—环境工程]