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《Journal of Beijing Forestry University》 1988-02
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A Preliminary Study on Drought Resistance of Pinus tabulaeforrnis and Platycladus orientalis Seedling

Li Jiyue (Forest Resource College)  
The experiments was carried out under the condition imitating atmospherical and soil drought in a walk-in Growth Chamber.The characteristics and mechanism of drought resistance of 2 year old Pinus tabu-laeformis and Platycladus orientalis seedlings were studied with respect to. their water status, plasma drought tolerance and water use efficiency. The main points examined were water potential, water staturation deficit ,bound-water content, water holding ability, plasma relative permeability, photosynthesis,and transpiration. The results show that the seedling water potential becomes more negative,the transpiration rate decreases, and the net photosynthetic rate gradually declines as soil water stress develops. The results also show that their mechanism of drought resistance is somehow different. The Pinus tabulaeformis seedling is of dehydration postpon-ment: having a greater boundwater content, strong water holding ability, lower transpiration rate and an earlier closing stomata for decreasing water loss, avoiding plasma dehydration. On the other hand, the Platycladus orientalis seedling is of dehydration tolerance, raising the ability of taking in water by greatly declining seedling water potential,heavy plasma dehydration, only being subjected to slight injury, postponing close of the stomata and keeping a little transpiration and photosynthesis under severe drohght stress.
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