| 摘要: |
| 以移栽的野生云锦杜鹃 Rhododendron fortunei 为材料，使用 LI-6400 便携式光合作用仪，分析 10% 光照和全光照下低海拔区域引种云锦杜鹃的光合日变化，结果显示 10% 光照下生长的云锦杜鹃蒸腾速率低于全光照下生长的云锦杜鹃，而水分利用效率高于全光照下云锦杜鹃的 60.17%。两种光照下的云锦杜鹃净光合速率和蒸腾速率日变化呈现“单峰”型。全光照下净光合速率下降是非气孔限制引起的，而 10% 光照下则为气孔限制引起。研究说明种植在低海拔环境的云锦杜鹃喜光的特性并不因为温度高而改变，但夏季遮荫措施还是有必要的。 |
| 关键词: 云锦杜鹃 光合作用 低海拔 日变化 |
| DOI： |
| 分类号: |
| 基金项目:浙江省科研院所扶持专项 (2020F1065-1)。 |
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| Diurnal Variation of Photosynthesis of Rhododendron fortunei in Two Kinds of Illumination Intensity under Low Altitude |
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Yang Hua1, SONG Xuzhong2, WANG Xiuyun2, SHEN Jian3, ZHENG Guoliang3
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1.Zhejiang Academy of Forestry;2.Zhejiang Academy of Forestry, Hangzhou;3.Jinhua Forestry Technology Promotion Station
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| Abstract: |
| The diurnal variation of photosynthesis of wild Rhododendron fortunei introduced at low
altitude area under 10% light and full light was measured using LI-6400 portable photosynthesizer. The results
showed that the transpiration rate of R. fortunei under 10% light was lower than that of full light, while water
utilization efficiency was 60.17% higher than that of full light. The diurnal variation of net photosynthetic rate and
transpiration rate under two kinds of lights showed single peak. The decrease of net photosynthetic rate under full
light was not caused by stomatal restriction, while it was caused by stomatal restriction under 10% light. Research
suggested that the light-loving characteristics of R. fortunei were not changed for the high temperature in the
introduction area and summer shading was still necessary. |
| Key words: Rhododendron fortunei photosynthesis low altitude diurnal variation |
