| Effects of Repeated Cycles of Dehydration-Rehydration on Drought Tolerance of Jack Pine and Black Spruce Seedlings |
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| 作者姓名： | 李吉跃 |
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| 作者单位： | 加拿大多伦多大学林学院，北京林业大学森林资源与环境学院 |
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| 摘 要： | 应用根系喷雾箱（ＲｏｏｔＭｉｓｔｉｎｇＣｈａｍｂｅｒ，ＲＭＣ）形成的５次干旱循环，通过ＰＶ曲线的水分参数研究了多重复干旱循环对１年生北美短叶松ＰｉｎｕｓｂａｎｋｓｉａｎａＬａｍｂ．和黑云杉Ｐｉｃｅａｍａｒｉａｎａ［Ｍｉｌ］Ｂ．Ｓ．Ｄ．苗木耐旱特性的影响．结果表明，生长在干旱沙地的深根性树种北美短叶松，其丧失膨压的相对含水量（８０７６％～８１４１％）和水势（（－１７４±０１０）ＭＰａ）都比较低，细胞弹性模量（５７３～６５２ＭＰａ）比较小，而束缚水含量（５２７２％～５４２６％）比较高，显示出它固有的强有力的忍耐脱水能力；但是在多重复干旱循环下它却不能进一步调节其渗透势和细胞弹性，而且其束缚水含量和吸水能力也有所下降．生长在湿润地区的浅根性树种黑云杉，虽然其丧失膨压的相对含水量（８３５３％～８５５０％）和水势（（－１６８±００３）ＭＰａ）比较高，细胞弹性模量（８６２～９６４ＭＰａ）比较大，束缚水含量（３６４４％～４６０５％）比较低，显示出较弱的耐旱能力，但是它在多重复干旱循环下却能提高其束缚水含量以改善原生质耐旱程度，降低细胞弹性以提高其吸水能力，调节其渗透势以保持较高的膨压．这表
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| 关 键 词： | 北美短叶松，黑云杉，耐旱性，PV曲线，渗透调节，细胞弹性模量 |
Effects of Repeated Cycles of Dehydration Rehydration on Drought Tolerance of Jack Pine and Black Spruce Seedlings |
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| Terence J.Blake Faculty of Forestry,University of Toronto,Toronto,Ontario,Canada MS B Li Jiyue College of Forest Resources and Environment,Beijing Forestry University,Beijing ,P.R.China.Effects of Repeated Cycles of Dehydration-Rehydration on Drought Tolerance of Jack Pine and Black Spruce Seedlings[J].Forestry Studies in China,1998(2). |
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| Authors: | Terence JBlake Faculty of Forestry University of Toronto Toronto Ontario Canada MS B Li Jiyue College of Forest Resources and Environment Beijing Forestry University Beijing PRChina |
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| Institution: | Terence J.Blake Faculty of Forestry,University of Toronto,Toronto,Ontario,Canada M5S 3B3 Li Jiyue College of Forest Resources and Environment,Beijing Forestry University,Beijing 100083,P.R.China |
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| Abstract: | |
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| Keywords: | jack pine( Pinus banksiana ) black spruce( Picea mariana) drought tolerance pressure volume analysis elastic adjustment osmotic adjustment |
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