| 摘要: |
| 在田间自然条件下对3个从日本引进的枇杷良种（3号、8号和9号）和1个当地主栽良种（4号）的光合特性进行了比较研究。结果表明，在晴天和阴天，4个枇杷品种叶片的净光合速率（Pn）日变化均呈双峰曲线，具有典型的“午休”特征；阴天时4个枇杷品种的Pn均比晴天时高。阴天时除9号品种外，其他3个品种的蒸腾速率（Tr）日变化呈双峰曲线；晴天时除3号品种的Tr日变化呈双峰曲线外，其他3个品种均为单峰曲线。4个枇杷品种细胞问CO2浓度的升降并不完全受气孔导度的影响，造成晴天和阴天出现光合“午休”现象的内在原因主要是非气孔因素。晴天和阴天均以9号品种的日均水分利用率最高，表明9号枇杷品种最耐旱。 |
| 关键词: 枇杷 净光合速率 蒸腾速率 水分利用率 |
| DOI： |
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| 基金项目:国家林业局“948”国际引进项目（99-4-09） |
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| Comparative study on photosynthetic characteristics of different loquat varieties |
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| Abstract: |
| The photosynthetic characteristics of 3 different loquats introduced from Japan were studied in comparison with a local variety under natural condition.The curves of diurnal variation of net photosynthesis rate (Pn) showed two peaks under clear and cloudy day.There was a clear depression at noon;The Pn at cloudy day was higher than that at clear day.The curves of diurnal variation of transpiration (Tr) of 3 species showed two peaks under cloudy day except No.9;but the curves of diurnal variation of transpiration (Tr) of 3 species showed one peak under clear day except No.3.Depression of Pn was caused by noncommittal factors.The No.9 Loqaut was the highest in drought resistance. |
| Key words: loquat photosynthetic rate transpiration rate WUE |
