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• W2070506244 abstract "We measured diurnal changes of CO2 flux from bare soil in agricultural field in central Japan. Measurements of soil CO2 flux were made by the open-flow IRGA method. Temperature and ambient CO2 concentration, which are highly variable in time, were also monitored during the measurements. The soil CO2 flux showed significant diurnal changes, and these patterns were highly correlated with the soil surface temperatures. The measured values ranged from 2.52×10−2 to 8.54×10−2 mg CO2 m−2 s−1 in August and from −4.95×10−3 to 1.13×10−2 mg CO2 m−2 s−1 in February. Moreover, a negative linear relationship between soil CO2 flux and ambient CO2 concentration was found in diurnal fluctuations. To explore the mechanism of these daily cycles, we estimated soil CO2 flux with a coupled model of soil microbial activity and gas diffusion. The parameter functions used in our calculation were obtained based on the measured values during the same time of soil respiration measurements. The soil CO2 production rates were obtained by laboratory experiments using the undisturbed soil core samples, which were taken from the field measuring soil respiration. The calculated soil CO2 flux ranged from 4.41×10−2 to 7.78×10−2 mg CO2 m−2 s−1 in August and 1.14×10−3 to 5.03×10−3 mg CO2 m−2 s−1 in February. These patterns of diurnal variability were similar for the measured ones, and the daily amounts estimated by integrating the model outputs were almost equal to those from the measured values. However, the amplitude of the measured respiration rates was larger than that of the estimated ones. The differences between measured and estimated values were related with thermal gradient around soil surface. The calculation suggested that the soil horizon above 10 cm depth would be a major CO2 source of soil respiration at about 70% in August and 40% in February. The depth of soil horizon in which soil microbial activity was significantly higher was not settled and would have a seasonal variation." @default.
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• W2070506244 date "2002-02-01" @default.
• W2070506244 modified "2023-10-17" @default.
• W2070506244 title "Diurnal changes of carbon dioxide flux from bare soil in agricultural field in Japan" @default.
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• W2070506244 doi "https://doi.org/10.1016/s0929-1393(01)00180-9" @default.
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