A preliminary study on drought resistance of Pinus tabulaeformis and Platycladus orientalis seedling.
1988
Li Jiyue
The drought resistance of Pinus tabulaeformis and Platycladus orientalis seedling was studied. 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 postponement: 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 closing of the stomata and keeping a little transpiration and photosynthesis under several drought stress.
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