| 干旱胁迫对常绿杨光合特性及生长量的影响 |
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| 引用本文： | 钱莲文,郭建宏,杨智杰.干旱胁迫对常绿杨光合特性及生长量的影响[J].福建林学院学报,2009,29(1). |
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| 作者姓名： | 钱莲文 郭建宏 杨智杰 |
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| 作者单位： | 1. 泉州师范学院,福建,泉州,362000
2. 福建师范大学地理科学学院,福建,福州,350007 |
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| 基金项目： | 国家林业局引进国际先进农业科学技术计划(948计划)，福建省自然科学基金 |
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| 摘 要： | 利用气体交换法和叶绿素荧光技术,对常绿杨3个无性系干旱胁迫及复水处理后的光合生理变化进行了研究。结果表明,在干旱胁迫初期,常绿杨光合速率(Pn)、气孔导度(Gs)和胞间CO2浓度(Ci)均随胁迫的增强而下降,随着干旱胁迫的增强,Pn、Gs继续下降,但Ci上升,说明在轻度干旱胁迫下Pn下降的主要原因可能是Gs下降,而重度干旱胁迫下Pn下降的主要原因是非气孔因素。同步叶绿素荧光测定结果表明,干旱胁迫会使PSII潜在活性中心受损,影响到光合电子传递,是Pn下降的主要原因。与对照相比,经过干旱胁迫的3个无性系生长量与生物量明显下降,说明即便后期供水充足,前期的缺水也会对苗木生长产生不可恢复的影响,但3个无性系之间差异不显著。
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| 关 键 词： | 常绿杨 干旱胁迫 光合特性 生物量 |
Effects of drought stress on photosynthesis and growth of three ever green poplar |
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| QIAN Lian-wen,GUO Jian-hong,YANG Zhi-jie.Effects of drought stress on photosynthesis and growth of three ever green poplar[J].Journal of Fujian College of Forestry,2009,29(1). |
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| Authors: | QIAN Lian-wen GUO Jian-hong YANG Zhi-jie |
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| Institution: | 1.Quanzhou Normal University;Quanzhou;Fujian 362000;China;2.College of Geographical Sciences;Fujian Normal University;Fuzhou;Fujian 350007;China |
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| Abstract: | The effects of drought stress and rehabilitation of water on the photosynthesis of three ever green poplar clones were investigated by gas exchange and chlorophyll fluorescence techniques.The results showed that in the early phase of drought stress,the photosynthetic rates,stomata conductance and intercellular CO2 concentration decreased with the enhancing of drought stress.While in the late phase,the photosynthetic rates and stomata conductance decreased and the intercellular CO2 concentration increased.So... |
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| Keywords: | ever green poplar drought stress photosynthesis characteristics biomass |
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