Photosynthetic response ofPinus sylvestriformis to elevated carbon dioxide and its influential factor analysis

Autor: Wang Chen-rui, Luo Xing-bo, Han Shi-jie
Rok vydání: 2000
Předmět:
Zdroj: Journal of Forestry Research. 11:167-172
ISSN: 1993-0607
1007-662X
Popis: The photosynthetic response of 12-year oldPinus sylvestriformis to elevated CO2 and its influential factors were tested and analyzed in the forest region of Changbai Mountain in 1999. Trees grown at the natural condition were controlled at three levels of CO2 concentration (350 μL·L−1, 500 μL·L−1 and 700 μL·L−1) by CO2 rich settlement designed by us. Net photosynthetic rates (NPR), temperature, relative humidity, stomatal conductance, intercellular CO2 concentration and photosynthetic active radiation (PAR) were measured at 6:00, 8:00, 10:00, 14:00, 16:00 and 18:00 hours a day. Experimental results showed that the NPR ofPinus sylvestriformis increased by 32.6% and 123.0% at 500 μL·L−1 and 700 μL·L−1 CO2 concentration respectively, compared to ambient atmospheric CO2 concentration (350 μL·L−1). The relations between NPR and influential factors, including temperature, relative humidity, intercellular CO2 concentration and photosynthetic active radiation, were analyzed respectively by regression analysis at different CO2 concentrations.
Databáze: OpenAIRE
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