Characteristics of carbon flux in mixed coniferous and broad-leaved forests in the mountainous areas of Eastern China
This study explored the carbon sink capacity of the complex mountainous forest ecosystem around the Damaojian Mountain in Wuyi County,Jinhua,Zhejiang Province.Utilizing the eddy covariance method,CO2 fluxes were monitored from June 2022 through May 2023.After rigorous data quality control and analysis,42％of the data were identified as high-quality CO2 flux measurements.The study draws the following conclusions:This area,primarily composed of mixed coniferous and broad-leaved forests with an energy closure rate of 0.89,effectively represents the flux conditions of the site.The CO2 flux exhibited a U-shaped daily variation,with fluctuations ranging from-1.20 to 0.89mg CO2/(m2·s).An analysis of the seasonal carbon sink capacity revealed the strongest absorption in summer,followed by spring,autumn,and winter,with the net ecosystem carbon exchange(NEE)demonstrating a consistent carbon sink effect month-over-month.The analysis highlighted a negative correlation between CO2 flux and air temperature,whereas both relative humidity and average wind speed positively influenced the CO2 flux.Nighttime respiration-induced CO2 flux also showed a positive correlation with soil temperature.Overall,we have preliminarily explained the unique carbon sink features of the Damaojian Mountain forest ecosystem.
CO2 fluxeddy covariancenet ecosystem carbon exchangeforest ecosystemcomplex terrain
万方数据
维普
