| 樟子松小枝不同水分状况下蒸腾速率变化特征研究 |
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| 引用本文： | 田有亮,郭连生.樟子松小枝不同水分状况下蒸腾速率变化特征研究[J].干旱区资源与环境,2005,19(5):174-178. |
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| 作者姓名： | 田有亮 郭连生 |
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| 作者单位： | 内蒙古农业大学,呼和浩特010019;内蒙古农业大学,呼和浩特010019 |
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| 基金项目： | 国家自然科学基金项目（30160071）和内蒙古自然科学基金项目（20001305）. |
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| 摘 要： | 本文通过测定樟子松小枝在不同水势下的蒸腾速率变化,研究樟子松不同水分状况下蒸腾速率的变化特征,探讨了樟子松对水分胁迫的适应性。结果指出随着樟子松小枝水势下降其蒸腾速率呈下降趋势,二者关系曲线呈“S”型。初始失膨点渗透势(πp)、相对蒸腾速率(RTπp)和蒸腾速率近0拐点的水势(ψrtc)、相对蒸腾速率(RTc)可用于评价树木对水分胁迫的适应性,其值愈小,适应性愈强,其值在树木嫩枝生长期较大,而在完全木质化时期较小。
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| 关 键 词： | 樟子松 蒸腾作用 水分胁迫 |
| 文章编号： | 1003-7578（2005）05-174-05 |
| 收稿时间： | 2004-12-06 |
| 修稿时间： | 2004年12月6日 |
Research on the Transpiration Characteristics at the Different Water Conditions of Pinus sylvestris var. mongolica |
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| TIAN You-liang,GUO Lian-sheng.Research on the Transpiration Characteristics at the Different Water Conditions of Pinus sylvestris var. mongolica[J].Journal of Arid Land Resources and Environment,2005,19(5):174-178. |
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| Authors: | TIAN You-liang GUO Lian-sheng |
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| Abstract: | This research studied on the transpiration characteristicsat different water conditions bymensurating transpirationrates under different water potentials of the branchlets of Pinus sylvetris var.mongolica and the responses and adaptabilities to water stress.The result indicated transpirationrates decreased with the water potentials of the branchlets,and the relative curves between them were showed as "S". The relative transpirationrates and water potentials at the initial loss point of the turgor(RT_(πp )andπp) and at the compensation point of transpirationrate approximating to 0 (RTc andψrtc) could evaluatethe tree's adaptability to water stress,the values of them were small,the tree'sadaptabilitywas stronger. Their values were greater in the growth periodof the new branchs in the annual growth of trees than in thematuration periodof the branchlets. |
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| Keywords: | Pinus sylvetris var mongolica transpiration water stress |
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