Effect of drought stress on apparent resource utilization efficiency of Quercus mongolica

Abstract

Abstract: To study the effect of drought stress on the physiological characteristics and resource utilization effciency of Quercus mongolica,a dominant species in the Korean pine broad leaved forest in Changbai Mountain,a comparative experiment was carried out under three soil moisture gradients as 85%～100%(high water,CK),65%～85%(Medium water,MW),and 45%～65%(low water,LW) of field water bolding capacity. The results showed that net photosynthetic rate,stomatal conduction,transpiration rate,water utilization efficiency,apparent CO₂ utilization efficiency and apparent light utilization efficiency of the seedlings of Quercus mongolica were all significantly influenced by simulated drought stress. Stomatal conduction,water utilization efficiency and net photosynthetic rate of large tress of Quercus mongolica were affected by the soil drought stress,while transpiration rate,apparent CO₂ utilization efficiency,and apparent light utilization efficiency were not influenced. Mode rate soil water condition could greatly increase gas exchange and water utilization efficiency. These results indicated that the responses of gas exchange and resource utilization efficiency to various water stresses were diffe rent. Quercus mongolica was a species with variable resistance to drought stress,and the resistance would be improved by drought stress,especially moderate water stress.

CLC Number:

Q945

WANG Miao, DAI Limin, JI Lanzhu . Effect of drought stress on apparent resource utilization efficiency of Quercus mongolica[J]. Chinese Journal of Applied Ecology, 2002, (3): 275-280.

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