Forestry
and Forest Products Research Institute erected a CO2 flux observation
tower at a Japanese beech forest, and have measured CO2 flux with
closed-pass eddy covariance method for 5 years. During the observation period, 2003
was the most CO2 absorbed year, and the amount was 1.9 times larger
than 2004, which was the least CO2 absorbed year. To investigate the
cause of the smaller CO2 absorption in 2004, we referred some
meteorological factors in 2003 and 2004.
Solar radiation (during green-leaved season) was larger in 2004 than
2003, in contradiction to CO2 absorption. On the other, air temperature was higher in 2004
than 2003 (both in green-leaved and defoliated season). We assumed that larger
respiration in 2004 effected the depression of annual CO2
absorption. At our research site, annual
mean air temperature in 2004 was 0.95 degree centigrade warmer than 2003. The result of this study suggests the
tendency that warmer climate may cause less CO2 absorption in this
Japanese beech forest.
Author: T. Saito, Y. Ohtani, Y. Mizoguchi, T. Morisawa (saitota at affrc dot go dot jp)
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