论文部分内容阅读
2011年8月27日,利用CI-340手持式光合作用测定系统(美国CID公司)测定冬枣叶片的净光合速率、蒸腾速率、光合有效辐射强度、气孔导度、胞间CO2浓度等生理生态因子。结果表明,冬枣叶片净光合速率日变化呈双峰曲线,有明显的“午休”现象;蒸腾速率、气孔导度日变化趋势与净光合速率日变化趋势相似;胞间CO2浓度日变化与净光合速率日变化趋势相反,呈倒双峰曲线;光合有效辐射强度日变化呈典型的单峰曲线,水分利用效率日变化趋势与之相反,呈倒单峰曲线。净光合速率与气孔导度呈极显著正相关,与蒸腾速率、水分利用效率呈显著正相关;水分利用效率与气孔导度呈显著正相关,与光合有效辐射强度呈显著负相关。净光合速率与光合有效辐射强度、胞间CO2浓度相关性不显著。
On August 27, 2011, physiological and biochemical factors such as net photosynthetic rate, transpiration rate, photosynthetically active radiation intensity, stomatal conductance and intercellular CO2 concentration of jujube leaves were determined by CI-340 Handheld Photosynthesis System (CID) . The results showed that diurnal variation of net photosynthetic rate of jujube leaves showed a double peak curve with significant “noon ” phenomenon; diurnal variation trend of transpiration rate and stomatal conductance was similar to diurnal variation trend of net photosynthesis rate; diurnal variation of intercellular CO2 concentration and The diurnal variation trend of net photosynthetic rate was contrary, showing a double peaked curve. The diurnal variation of photosynthetic active radiation intensity was a typical single peak curve. The diurnal variation trend of net photosynthetic rate was the opposite and showed a single peak curve. There was a significant positive correlation between net photosynthetic rate and stomatal conductance, and a positive correlation between transpiration rate and water use efficiency. There was a significant positive correlation between water use efficiency and stomatal conductance and a negative correlation with photosynthetic active radiation intensity. There was no significant correlation between net photosynthetic rate and photosynthetically active radiation intensity and intercellular CO2 concentration.