CHEN Gui-fang, CAI Kong-yu, LOU Li-hua, LI Zai-jun. Preliminary Study on Variation of Diurnal Photosynthesis of Distylium chinense Plants[J]. Journal of Southwest Forestry University, 2008, 28(3): 1-3. DOI: 10.11929/j.issn.2095-1914.2008.03.001
Citation: CHEN Gui-fang, CAI Kong-yu, LOU Li-hua, LI Zai-jun. Preliminary Study on Variation of Diurnal Photosynthesis of Distylium chinense Plants[J]. Journal of Southwest Forestry University, 2008, 28(3): 1-3. DOI: 10.11929/j.issn.2095-1914.2008.03.001
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Preliminary Study on Variation of Diurnal Photosynthesis of Distylium chinense Plants

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  • The main photosynthesis indexes of Distylium chinense were measured with CB-1102 portable photosynthesis instrument under natural condition. The results showed that the daily progress of photosynthesis rate(Pn) was an obvious double-peak curve. The peak values were at 12:00 am and 16:00 pm respectively. Light noon break occurred at about 14:00 pm. The maximum net photosynthesis rate occurred at 12:00 am and was only 9.37 μmol /m2·s. The curve of diurnal variation of transpiration rate was one peak curve, but the peak value appeared at 12:00 am to 16:00 pm, which was 4.34 μmol/m2·s or so. Photosynthesis rate was also affected to different extents by eco-physiological factors such as transpiration, temperature, Ci and PAR.
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