ACG30-P04Room:Convention HallTime:May 25 18:15-19:30
In situ measurement of soil carbon monoxide ﬂux in temperate forest
KAWAI, Amy1∗ ; TAKAHASHI, Kenshi2 ; SAKABE, Ayaka3 ; KOSUGI, Yoshiko3
1Faculty of Agriculture, Kyoto University, 2Research Institute for Sustainable Humanosphere, Kyoto University, 3GraduateSchool of Agriculture, Kyoto University
Carbon monoxide plays an important role in the tropospheric chemistry via its reaction with the OH radical. Soil uptake ofCO is a sink of secondary importance, except for the chemical reaction with the OH. However, no reports are available on soilCO ﬂux continuously measured in the ﬁeld of forest. Therefore, it is still unknown about the dynamics of CO in the temperateforest ecosystem, especially the response to the micrometeorological and soil environmental change. In this study, we intendedto clarify the effects of the differences of the soil environment by measuring soil CO ﬂux with the closed-chamber method and alaser spectrometer.Soil CO ﬂux was observed in Kiryu hydrological study site (KEW), in Shiga Prefecture, Japan. KEW has 55-year-old cypressforests. Priority species of the forest ﬂoor is Eurya japonica growing sparsely. CO ﬂuxes between soil surface and the atmospherewere measured using the closed chambers, in which changes in CO concentration during the chamber closure were monitoredin-situ with the laser spectrometer. Three chambers were set up in three locations under different soil environment. Also, the soilmoisture content and soil temperature in the three plots were measured.We found a signiﬁcant absorption of atmospheric CO by soil surface. Focusing on the differences with the plot, less absorptionwas found in the plot of less humus layer. More CO absorption was observed when the CO concentration of surrounding areawas high.