Effect of elevated CO2 concentration on leaf water regime of subtropical tree seedlings

Abstract

Abstract: Potted seedlings of Castanopsis fissa and Schima superba, two dominant species in monsoon evergreen broad leaf forest of Dinghushan, Guangdong Province, are grown in semi opened chambers with ambient(340 μl·L^-1) and elevatcd (500±50 μl·L^-1) CO₂ concentration under natural light for three months.The stomatal conductance of leaves grown in high CO₂ is decreased by 13% for C.fissa and by 18% for S.superba,and their transpiration rate is decreased by 20% and 18%, respectively. For these two species, their water use efficiency is increased by more than 100%. The diurnal courses of stomatal conductance and transpiration rate are quite different between plants grown in elevated and ambient CO₂. When all plants are put back to ambient CO₂ without chamber, no obvious difference of stomatal conductance and transpiration rate is observed on the seventh day.

Key words: Elevated CO₂, Castanopsis fissa, Schima superba, Stomatal conductance, Transpiration rate, ecological niche., isotope, jellyfish, zooplankton, food source

Wei Caimiao, Kong Guohui, Lin Zhifang. Effect of elevated CO₂ concentration on leaf water regime of subtropical tree seedlings[J]. Chinese Journal of Applied Ecology, 1997, 8(1): 12-16.

References

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Effect of elevated CO₂ concentration on leaf water regime of subtropical tree seedlings

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