| 摘要: |
| 对应用于屋顶绿化的5种园林植物的抗旱性进行研究，分析了不同水分胁迫条件下，5种植物的叶片相对电导率、叶片相对含水量、叶绿素荧光、净光合速率、蒸腾速率和气孔导度等变化趋势。结果表明：随着水分胁迫强度的增大，5种植物的叶片相对电导率呈上升趋势，叶片相对含水量、叶绿素荧光、净光合速率、蒸腾速率和气孔导度呈下降趋势，但不同植物的抗旱生理指标变化幅度不尽相同。主成分分析结果表明，综合抗旱能力强弱为小蚌兰>铺地锦>假花生>马缨丹>南美蟛蜞菊；叶片相对含水量是评价水分胁迫最重要的指标，其次为相对电导率。 |
| 关键词: 屋顶绿化 园林植物 水分胁迫 抗旱生理 |
| DOI： |
| 投稿时间：2009-08-06修订日期：2009-09-15 |
| 基金项目: |
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| Drought Resistances of Five Roof-greening Plants to Different Water Stresses |
| Liu Qian |
| () |
| Abstract: |
| The drought resistances of five species of common garden plants applied in roof garden were studied. The responses of their leaf relative electrical conductance rate, relative water content, Fv/Fm，Fv/Fo, net photosynthetic rate, transpiration rate, and stomatal conductance to different water stresses were studied. The results showed that the leaf relative electrical conductance rate increasing and other index appeared declining trend with the increasing of water stress, the physiological resistance to the drought have different change rate of different plants.The synthesis evaluation result by principle component analysis showed that the order of drought resistance was Rhoeo discolor > Melastoma dodecandrum > Arachis duranensis > Lantana camara > Wedelia trilobata. The relative water content was the most important indicators to evaluation water stress, and the relative electrical conductance rate was the second one. |
| Key words: roof-greening, garden plant, water stress, physiological resistance to the drought |
