Canopy Net Photosynthesis Rate of a Mongolian Oak (Quercus mongolica) Forest Estimated by Field Experimental Data
| Autor: | Soon-Ung Park, Seung Jin Joo |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Canopy 010504 meteorology & atmospheric sciences biology Growing season General Medicine Seasonality Photosynthesis medicine.disease biology.organism_classification Atmospheric sciences 01 natural sciences Mongolian oak Botany medicine Environmental science Leaf area index Tree species Photosynthetic photon flux density 010606 plant biology & botany 0105 earth and related environmental sciences |
| Zdroj: | American Journal of Plant Sciences. :390-411 |
| ISSN: | 2158-2750 2158-2742 |
| Popis: | The canopy net photosynthesis rate of Mongolian oak (Quercus mongolica) tree species that are dominant in East Asia and Korea is estimated with empirical models derived from field experimental data obtained from the Nam-San site in Seoul, Korea for the growing period from early May to late October in 2010. The empirical models include the attenuation function of photosynthetic photon flux density (PPFD) (r2 = 0.98-0.99, p < 0.001) and the photosynthetic light response function (r2 = 0.99, p < 0.001) derived from the measured data at several levels within the canopy. The incident PPFD at each level within canopy significantly varies diurnally and seasonally due to the seasonal variation of the total plant area index (TPAI = leaf area index + wood silhouette area index) and the light shielding effect of light path-length through the canopy in association with the variation of solar elevation angle. Consequently, a remarkable seasonal variation of the total canopy net photosynthesis rate of Q. mongolica forest stand is found for its growing period. The PPFD exceeding 1000 μmol m-2·s-1 is found to cause the decrease of net photosynthesis rate due to the thermal stress in the early (May) and late (September) growing period. During the whole growing season, the estimated total canopy net photosynthesis rate is found to be about 3.3 kg CO2 m-2. |
| Databáze: | OpenAIRE |
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