Three-Year Study on Diurnal and Seasonal CO<sub>2</sub> Sequestration of a Young <em>Fraxinus griffithii</em> Plantation in Southern Taiwan
Chen, Chung-I | Wang, Ya'nan | Lih, Hsueh-Wen | Yu, Jui-Chu
This study examined monthly carbon sequestration of the Himalayan ash (Fraxinus griffithii C. B. Clarke), an important plantation species in Taiwan. From January 2010 to December 2012, data were collected from an F. griffithii plantation in southern Taiwan, which experiences a typical Southeast Asia monsoon climate. To estimate CO<inf>2</inf> sequestration rate, we conducted diurnal measurements of photosynthetic rates and seasonal measurements of photosynthetic light response curves. We also calculated leaf area index to estimate the total leaf area of individual trees. The diurnal variation in photosynthetic rate, stomatal conductance, and transpiration exhibited seasonal and annual differences. The range of net CO<inf>2</inf> assimilation rates was 1.34–8.68 µmol·m−2·s−1 in 2010, 1.02–6.60 µmol·m−2·s−1 in 2011, and 1.13–4.45 µmol·m−2·s−1 in 2012. A single F. griffithii tree sequestrated 12.21 kg·year−1 CO<inf>2</inf> on average. Annual CO<inf>2</inf> sequestration occurred primarily during the summer for all years, averaging 14.89 Mg·ha−1·year−1 for three years. Correlation analyses between various environmental variables and CO<inf>2</inf> sequestration rates indicated that air temperature and soil water content were likely the main factors influencing carbon sequestration of F. griffithii at this study site.
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