Seasonal Variation of CO2 Exchange During the Barley Growing Season at a Rice-barley Double Cropping Paddy Field in Gimje, Korea
2014
Min, S.H., RDA, Suwon, Republic of Korea | Shim, K.M., RDA, Suwon, Republic of Korea | Kim, Y.S., RDA, Suwon, Republic of Korea | Hwang, H., RDA, Suwon, Republic of Korea | Jung, M.P., RDA, Suwon, Republic of Korea | Choi, I.T., RDA, Suwon, Republic of Korea
Rice-barley double cropping system is typical in southwestern part of South Korea. However, the information of carbon dioxide (CO2) exchange for barley growing season has still limited in comparison with rice. Using the eddy covariance (EC) technique, seasonal variation of CO2 exchange was analyzed for the barley growing season at a rice-barley double cropping field in Gimje, Korea. The effects of environmental factors and biomass on the CO2 flux also were investigated. Quality control and gap-filling of flux data were conducted before this analysis and investigation. The results indicated that CO2 uptake increased rapidly at tillering stage and maximum net ecosystem exchange of CO2 (NEE) occurred at the early of May, 2012 (-11.2g C m-2 d-1), when the heading of barley occurred. NEE, gross primary production (GPP), and ecosystem respiration (Re) during the barley growing season were -348.0, 663.3, and 315.2 g C m-2, respectively. In this study, an attempt has been made to measure NEE, GPP, and Re with the help of the EC system for the barley growing season for the first time in Korea, focusing on CO2 exchange between the biosphere and the atmosphere.
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