| 摘要: |
| 在田间栽培条件下，用英国TPS-1型便携式光合测定仪对二色补血草（L.bicolor）、黄花补血草（L.aureum）和欧洲补血草（L.perezii‘BlueSea’）3种补血草属植物的光合特性日变化进行了比较研究。结果表明，3种补血草属植物光合速率（Pn）的日变化均呈双峰曲线，次高峰远低于最高峰，欧洲补血草和二色补血草的Pn在10：00时达到最高峰，黄花补血草在11：00时达到最高峰，黄花补血草的Pn显著低于欧洲补血草和二色补血草，后两者的Pn无显著差异；3种植物叶片蒸腾速率（Tr）和气孔导度（Gs）的日变化动态与其Pn基本相似，胞间CO2浓度（Ci）的日变化呈倒抛物线形，且3种植物间差异较小；3种补血草属植物Pn的日变化与其Tr、Ci及叶室温度（Tlc）和光照强度（Rs）的日变化呈显著或极显著正相关，而与Ci呈极显著负相关；中午11：00～14：00，叶室温度高于37 ℃、光照强度超过13.00万1x时，参试植物Pn下降，下降幅度最大的为黄花补血草，其次是欧洲补血草，二色补血草降幅最小。 |
| 关键词: 补血草属植物 光合特性 生理特性 |
| DOI： |
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| 基金项目:天津市高等学校科技发展基金项目（20031307） |
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| Studies on daily photosynthetic rate variation of three Limonnium species |
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| Abstract: |
| The photosynthetic characters comparison between three Limonnium species,L.bicolor,L.aureum,L.perezii‘Blue Sea’ were carried out using the TPS-1 photosynthetic instrument in the field light condition.The results showed that bimodal curves appeared in the daily photosynthesis variation of the three species with a much lower value of the second peak than that of the first peak.The first peak occurred at 10:00-11:00 and the second one at 16:00.The Pn of L.aureum was significantly lower than that of L.bicolor and L.perezii‘Blue Sea’,and there was no significant difference between L.bicolor and L.perezii‘Blue Sea’.Daily variation trend of leave Tr and Gs of the three species were almost same with Pn.There was a very significant or very significant positive relationship in Pn with Tr,Gs,Tlc and Rs,and a very significant negative relationship with Ci.Pn would decline when the temperature of leave chamber （Tlc） was higher than 37 ℃ and radiation strength （Rs） was over 13.00×104 lx.at noon 11:00-14:00.The order of decline degree for the tested plants were determined as follow：L.aureum>L.perezii‘Blue Sea’>L.bicolor. |
| Key words: Limonnium photosynthetic characteristics physiological characteristics |
