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A BIOMASS MODEL WITHOUT PHOTORESPIRATION FOR HUISACHE AT DIFFERENT CO_2 LEVELS.

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概要 This paper estimates daily biomass of Huisache (Acacia farnesiana) from leaf temperature dependent photosynthetic rates and a glucose to biomass storage calibration parameter (Φ_G^B). To test importan...ce of photorespiration at different CO_2 treatments, a biomass model assuming no photorespiration in leaves was developed and then checked against measured allometric biomass. Leaf temperature of Huisache was determined from energy balance, and photosynthetic rates were calculated from light and leaf temperature dependent Michaelis-Menten reactions. The Φ_G^B parameter was calculated to be 0.33 based on ambient CO_2 experiments. Results of biomass modeling over the first year's growth of Huisache (October, 1992-July, 1993) agreed with observation in Root Mean Squared Error (RTMSE)/mean ratios of 34%, 11%, and 7% for ambient CO_2, double, and triple ambient CO_2 concentrations, respectively. Larger error for ambient CO_2 growth suggested biomass accumulation was more sensitive to photorespiration at higher temperatures under ambient CO_2 growth than at elevated CO_2 levels.続きを見る

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登録日 2009.04.22
更新日 2015.11.09