Ecophysiological responses and carbon distribution ofPinus koraiensis seedlings to elevated carbon dioxide |
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| Authors: | Han Shi-jie Zhou Yu-mei Wang Chen-rui Zhang Jun-hui Zou Chun-jing |
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| Institution: | (1) Institute of Applied Ecology, Chinese Academy of Sciences, 110015 Shenyang, P.R. China |
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| Abstract: | The net CO2 assimilation rate, stomatal conductance, RuBPcase (ribulose 1,5-biphosphate carboxylose) activity, dry weight of aboveground
and belowgroud part, plant height, the length and diameter of taproot ofPinus koraiensis seedlings were measured and analyzed after six-week exposure to elevated CO2 in an open-top chamber in Changbai Mountain of China from May to Oct. 1999. Seedlings were planted in four different conditions:
on an open site, control chamber, 500 μL·L−1 and 700 μL·L−1 CO2 chambers. The results showed that the total biomass of the seedlings increased whereas stomatal conductance decreased. The
physiological responses and growth to 500 μL·L−1 and 700 μL·L−1 CO2 varied greatly. The acclimation of photosynthesis was downward to 700 μL·L−1 CO2 but upward to 500 μL·L−1 CO2. The RuBPcase activity, chlorophyll and soluble sugar contents of the seedlings grown at 500 μL·L−1 CO2 were higher than that at 700 μL·L−1 CO2. The concentration 500 μL·L−1 CO2 enhanced the growth of aboveground part whereas 700 μL·L−1 CO2 allocated more carbon to belowground part. Elevated CO2 changed the carbon distribution pattern. The ecophysiological responses were significantly different between plants grown
under 500 μL·L−1 CO2 and 700 μL·L−1 CO2.
Foundation Item: This paper was supported by Chinese Academy of Sciences.
Biography: HAN Shi-jie (1956-), male, Ph. Doctor, Professor in Laboratory of Ecological Process of Trace Substance in Terrestrial Ecosystem,
Institute of Applied Ecology, Chinese Academy of Sciences.
Responsible editor: Chai Ruihai |
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| Keywords: | Net CO2 assimilation Stomatal conductance RuBPcase Pinus koraiensis Biaomass |
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