【摘要】 该研究以不同生长年限的秋播川白芷为材料,探究一年生和二生年川白芷叶片最适光合响应曲线拟合模型以及两者的光合生理特性差异。试验结果表明,不同生长年限川白芷叶片最适光响应曲线拟合模型均为直角双曲线修正模型,其一年生植株叶片光饱和点为1 600μmol·m-2·s-1,二年生植株叶片光饱和点为1 700μmol·m-2·s-1;光补偿点分别为17. 98,52. 23μmol·m-2·s-1,符合典型阳生植物特征。不同生长年限川白芷叶片净光合速率、蒸腾速率、气孔导度日变化曲线均为单峰型,二年生川白芷叶片净光合速率和蒸腾速率日均值显著高于一年生川白芷,而气孔导度日均值无显著差异。不同生长年限川白芷叶片净光合速率都与气孔导度呈极显著正相关。一年生和二年生川白芷净光合速率与胞间CO2浓度分别呈极显著和显著负相关。一年生川白芷的蒸腾速率与有效光合辐射强度和空气温度呈显著正相关,与胞间CO2浓度呈极显著负相关;二年生白芷的蒸腾速率与有效光合辐射强度呈极显著正相关,而与胞间CO2浓度呈显著负相关。综上,二年生川白芷叶片光合效率高于一年生川白芷,但利用弱光能力不及一年生者,更适合种植于阳光充足地方。更多还原

【Abstract】 In this study,the leaves of autumn-sown Angelica dahurica var. formosana from Sichuan province in different growth years was used to explore the fitting model of photosynthetic response curve and the different photosynthetic physiological characteristics between annual and biennial A. dahurica var. formosana from Sichuan province. The results showed that the fitting model of the optimum light response curve of the leaves of A. dahurica var. formosana from Sichuan province with different growth years was all rectangular hyperbolic correction model. The light saturation points were 1 600,1 700 μmol·m-2·s-1,the light compensation points were17. 98,52. 23 μmol·m-2·s-1 in the leaves of annual and biennial plant,respectively. The diurnal variation curves of net photosynthetic rate,transpiration rate and stomatal conductance in the leaves all acted as a single peak value wave. The daily mean values of net photosynthetic rate and transpiration rate in the leaves of biennial plant were significantly higher than that of annual plant. There was no significant difference in daily mean stomatal conductance. The net photosynthetic rate was significantly positively correlated with stomatal conductance in both of the different growth years. The net photosynthetic rate of annual and biennial A. dahurica var. formosana from Sichuan province had extremely significant and significantly negative correlation with the intercellular CO2 respectively. The transpiration rate of annual plant was positively correlated with the effective photosynthetic radiation intensity and air temperature,but had significantly negative correlation with the intercellular CO2 concentration. The transpiration rate of biennial plant had extremely positive correlation with the effective photosynthetic radiation intensity,and negatively correlated with the intercellular CO2 concentration. In conclusion,the photosynthetic efficiency of the leaves in biennial plant of A. dahurica var. formosana from Sichuan province was higher than that in annual plant,but the ability to utilize weak light was lower than that of annual plant. It should be planted in the sunny field.更多还原