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油松侧柏苗木抗旱特性初探
引用本文:李吉跃.油松侧柏苗木抗旱特性初探[J].北京林业大学学报,1988,10(2):23-30.
作者姓名:李吉跃
作者单位:林业资源学院
摘    要:在人工气候室内,模拟大气干旱和土壤干旱条件,从苗木水分状况、原生质抗旱特性以及水分利用效率等三个方面,研究了2年生油松苗和侧柏苗的抗旱特性及其机理。结果表明:油松、侧柏苗木都具有较强的抗旱能力,但是,它们的抗旱机理则不相同。油松苗木以抗脱水为其抗旱特征,而侧柏苗木则以耐脱水为其抗旱特征。

关 键 词:油松  侧柏  水势    抗旱性  水分逆境

A Preliminary Study on Drought Resistance of Pinus tabulaeforrnis and Platycladus orientalis Seedling
Li Jiyue.A Preliminary Study on Drought Resistance of Pinus tabulaeforrnis and Platycladus orientalis Seedling[J].Journal of Beijing Forestry University,1988,10(2):23-30.
Authors:Li Jiyue
Institution:Forest Resource College
Abstract: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.
Keywords:Pinus tabulaeformis  Platycladus orientalis  water potential  drought resistance  water stress
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