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http://dx.doi.org/10.5532/KJAFM.2009.11.3.087

Evaluation of Modified Soil-Plant-Atmosphere Model (mSPA) to Simulate Net Ecosystem Carbon Exchange Over a Deciduous Forest at Gwangneung in 2006  

Lee, Young-Hee (Department of Astronomy and Atmospheric Sciences, Kyungpook National University)
Lim, Hee-Jeong (Department of Astronomy and Atmospheric Sciences, Kyungpook National University)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.11, no.3, 2009 , pp. 87-99 More about this Journal
Abstract
We evaluated modified Soil-Plant-Atmosphere model's performance to simulate the seasonal variation of net ecosystem exchange (NEE) of carbon and examined the critical controlling mechanism on carbon exchange using the model over a deciduous forest at Gwangnung in 2006. The modified Soil-Plant-Atmosphere (mSPA) model was calibrated to capture the mean NEE during the daytime (1000-1400 LST) and used to simulate gross primary productivity (GPP). Ecosystem respiration ($R_e$) has been estimated using an empirical formula developed at this site. The simulation results indicated that the daytime mean stomatal conductance was highly correlated with daily insolation in the summer. Low stomatal conductance in high insolation occurred on the days with low temperature rather than with high vapor pressure deficit. It suggests that the forest rarely experienced water stress in the summer of 2006. The model captured the observed bimodal seasonal variation with a mid-season depression of carbon uptake. The model estimates of annual GPP, $R_e$ and NEE were $964\;gC\;m^{-2}\;yr^{-1}$, $733\;gC\;m^{-2}\;yr^{-1}$, and $-231\;gCm\;^{-2}\;yr^{-1}$, respectively. Compared to the observed annual NEE, the modeled estimates showed more carbon uptake by about $140\;gC\;m^{-2}\;yr^{-1}$. The uncertainty of the estimate of annual NEE in a complex terrain is discussed.
Keywords
Complex terrain; Deciduous forest; mSPA model; Net ecosystem carbon exchange;
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