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Chinese Journal of Applied Ecology ›› 2002, Vol. ›› Issue (9): 1195-1197.

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Effect of Pinus sylvestriformis seedlings density on net photosynthetic rate under elevated CO2

WANG Chenrui, HUANG Guohong, ZHOU Yumei, HAN Shijie, ZHANG Junhui, ZOU Chunjing   

  1. Key Laboratory of Terrestrial Ecological Process, Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016
  • Received:2001-02-12 Revised:2001-11-01 Online:2002-09-15

Abstract: The effect of Pinus sylvestriformis seedlings density on net photosynthetic rate was studied under elevated CO2. Atmospheric CO2 concentration was controlled in OTC (Open Top Chamber). The results showed that elevated CO2 not only made net photosynthetic rates (NPRs) of two Pinus sylvestriformis seedlings densities increased,but also mitigated their intra-specific competition. Meanwhile,the difference of seedling NPRs between100 and 400 plant·m-2 under 500 μmol·mol-1 air CO2 concentration was less than that under 350 μmol·mol-1 with the same PARlevels. When air CO2 concentration reached 700 μmol·mol-1, the NPRs of seedlings under both planting densities were close to each other with the same PARlevels. The intra-specific competition was minimized under air CO2 concentration of 700 μmol·mol-1.

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