Publication Date
1997
Description
CO2 gas fluxes in grazing pastures were measured directly by the eddy correlation method to determine whether grasslands function as carbon sinks or sources. Observations revealed daytime CO2 absorption fluxes to grassland and nighttime CO2 emission fluxes to atmosphere. In 1993, the daily amounts of CO2 absorbed by grassland were larger than those of CO2 emitted to the atmosphere during the measuring period in spite of a cool summer and consequently lower level of solar radiation. In 1994, we obtained reverse carbon budgets especially on very hot days, which resulted from a different fluctuation pattern of the CO2 gas fluxes. However, CO2 absorption by grassland exceeded CO2 emissions on many days during the year as observed in 1993. These results suggest that grasslands may function as carbon sinks.
Citation
Oku, T; Shibata, S; Takahashi, S; and Shibayama, M, "CO2 Gas Fluxes in Grazing Pasture" (2024). IGC Proceedings (1993-2023). 9.
https://uknowledge.uky.edu/igc/1997/session9/9
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CO2 Gas Fluxes in Grazing Pasture
CO2 gas fluxes in grazing pastures were measured directly by the eddy correlation method to determine whether grasslands function as carbon sinks or sources. Observations revealed daytime CO2 absorption fluxes to grassland and nighttime CO2 emission fluxes to atmosphere. In 1993, the daily amounts of CO2 absorbed by grassland were larger than those of CO2 emitted to the atmosphere during the measuring period in spite of a cool summer and consequently lower level of solar radiation. In 1994, we obtained reverse carbon budgets especially on very hot days, which resulted from a different fluctuation pattern of the CO2 gas fluxes. However, CO2 absorption by grassland exceeded CO2 emissions on many days during the year as observed in 1993. These results suggest that grasslands may function as carbon sinks.
