We partitioned the components of
CO2 flux by the chamber
approaches for a 45-year-old larch forest in northern Japan.
In 2003, annual soil-CO2 efflux was averaged to 9.59 tC ha-1, heterotrophic respiration was about 5.47 tC ha-1 that accounted about 57% of the soil-CO2 efflux, net annual CO2 exchange of understory
vegetation was about -0.39 tC ha-1, annual aboveground
was bout 0.75 tC ha-1, and annual photosynthesis and respiration
of the canopy was about
-12.75 and 1.15 tC ha-1, respectively. Annual GPP, NPP, NEP and ecosystem
respiration for this forest was estimated
to be about 13.49, 7.16, 2.04 and 11.45 tC
ha-1, respectively. The contribution of canopy respiration,
respiration and heterotrophic respiration to GPP was about
8.1%, 5.6%, 30.6% and 40.5%, respectively.
Author: N. Liang, Y. Fujinuma, and G. Inoue (liang at nies dot go dot jp)
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