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Gwang Hyun Han,Young Bae Sim,Hisashi Yoshikoshi,Akira Miyata 한국응용생명화학회 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.6
At the ecosystem and global scales, the carbon isotopic compositions of CO2 and methane exchanged between the biosphere and the atmosphere (δN and δM, respectively) have been used to partition net fluxes of CO2 and methane into the source and sink terms. The temporal variations of δN and δM were investigated at the same time in a Japanese rice paddy by combining stable isotopes and concentration measurements within and above the canopy. There were close agreements between the measured concentrations and the δ13C values of CO2 and methane on both temporal and spatial scales. While atmospheric stability and environmental parameters influencing photosynthetic assimilation were the major controls on variability of [CO2] and δ13CO2,atmospheric stability was the predominant factor for driving changes in [CH4] and δ13CH4 profiles.We also found strong linear relationships between the measured isotopic compositions and the inverse of concentrations over the time spans of day, night, and whole day. The δN values determined on the two days contrasting in environmental conditions revealed that the relative contributions of photosynthetic assimilation and ecosystem respiration to the total CO2 exchange did not change significantly. In contrast, the δM values showed a marked difference between the sampling dates, reflecting a transpiration-induced shift in methane transport.
Han, Gwang-Hyun,Sim, Young-Hae,Yoshikoshi, Hisashi,Miyata, Akira The Korean Society for Applied Biological Chemistr 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.6
At the ecosystem and global scales, the carbon isotopic compositions of $CO_2$ and methane exchanged between the biosphere and the atmosphere (${\delta}_N$ and ${\delta}_M$, respectively) have been used to partition net fluxes of $CO_2$ and methane into the source and sink terms. The temporal variations of ${\delta}_N$ and ${\delta}_M$ were investigated at the same time in a Japanese rice paddy by combining stable isotopes and concentration measurements within and above the canopy. There were close agreements between the measured concentrations and the ${\delta}^{13}C$ values of $CO_2$ and methane on both temporal and spatial scales. While atmospheric stability and environmental parameters influencing photosynthetic assimilation were the major controls on variability of [$CO_2$] and ${\delta}^{13}CO_2$, atmospheric stability was the predominant factor for driving changes in [$CH_4$] and ${\delta}^{13}CH_4$ profiles. We also found strong linear relationships between the measured isotopic compositions and the inverse of concentrations over the time spans of day, night, and whole day. The ${\delta}_N$ values determined on the two days contrasting in environmental conditions revealed that the relative contributions of photosynthetic assimilation and ecosystem respiration to the total $CO_2$ exchange did not change significantly. In contrast, the ${\delta}_M$ values showed a marked difference between the sampling dates, reflecting a transpiration-induced shift in methane transport.