Characteristics of Methane Flux and Their Effect Factors on Dajiuhu Peatland of Shennongjia
Abstract：It is significant to do research on methane flux in Dajiuhu,to understand mechanism of the carbon cycle better,to manage it more scientifically and to assess the carbon balance in wetland ecosystem accurately.By using eddy covariance technique,methane fluxes of Dajiuhu subalpine peatland in Shennongjia Forestry Administrative District of Hubei Province,Central China were observed from August 2015 to May 2016,and temporal variation of methane emission and related affecting factors were investigated.The results show that the peatland ecosystem was methane sources,with the daily average release rate being 15.57 nmol · m-2 · s-1.During the sampling period,the mean diurnal variations showed a maximum value at night (2:00 or 22:00) and a three-peak pattern all day (6:00,12:00 and 22:00).The monthly average emission rate of CH4 decreased rapidly from August(36.46 nmol · m 2 · s 1),and its valley in March(3.92 nmol · m-2 · s-1),then increasing gradually from April.The correlation analysis indicates that CH4 flux was mainly dominated by air temperature (Ta),soil temperature (Ts),soil water content (SWC) and friction velocity (U*).And their relevance varied with different time scales.The curve fitting shows that CH4 flux was an exponential correlated with Ta and Ts,and had a good conic relationship with SWC.
Keywords：methane fluxpeatlandeddy covariancevariationeffect factorecologyhydrogeology
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 832-842 )