不同品种杏叶片光合、蒸腾日变化耦合分析

PHOTOSYNTHESIS- TRANSPIRATION COUPLING MECHANISM IN DIFFERENT APRICOT DURING DAILY VARIATION

本文应用CI-340超轻型便携式光合仪测定不同品种杏的光合、蒸腾日变化,全面分析不同品种杏叶片的光合-蒸腾耦合关系。结果发现:两个品种杏其净光合速率(Pn)、蒸腾速率(E)以及杏-串枝红的气孔导度(Gs)日变化均呈双峰变化,两个品种杏的光合有效辐射(PAR)、叶片温度(T)以及杏-串枝红的气孔导度(Gs)日变化呈单峰曲线;杏-串枝红、杏-龙王帽Pn-E均具有线性关系,相关系数分别为0.86、0.85,杏-龙王帽(斜率7.72)比杏-串枝红(斜率7.26)的线性耦合关系明显;PAR-T、PAR-Gs、Gs-T有线性正相关关系;PAR-Pn与PAR-E、E-Pn与T-E、Gs-Pn与Gs-E具有线性正相关关系,确保了在日变化过程中光合-蒸腾良好的线性耦合关系。

Taking different apricot as materials,portable photosynthesis analyzer CI- 340 was used to calculate their photosynthetic rate and transpiration rate. Furthermore,to comprehensively analyze the coupling mechanism between photosynthesis and transpiration. The results indicated： the daily variations of transpiration rate（ E） and photosynthesis rate（ Pn） in different apricot and tomatal conductance（ Gs） of Amygdalus persica Linn. are similar with each other and all appeared double- peak curve. However,leaf temperature（ T）,photosynthetic active radiation（ PAR） and tomatal conductance（ Gs） of Prunus armeniaca appeared one- peak curve. Pn is significantly linearly positive correlated with E in different apricot. And the correlation coeffcients are respectively 0. 86,0. 85. But Pn- E of Amygdalus persica Linn（ the slope is 7. 26） coupling mechanism is more obvious than that of Prunus armeniaca（ the slope is 7. 72）. Gs—T,PAR—Gs,PAR—T show positive correlation. Gs—Pn and Gs—E,E—Pn and T—E,PAR—Pn and PAR—E are also positive correlation. Then they ultimately result in the linear coupling of photosynthesis and transpiration during daily variation.