氮肥对大麦灌浆期叶片光合性能的影响及其相关性分析

为探究氮肥对春大麦叶片光合性能的影响,以蒙啤3号和蒙啤5号两个品种为材料,研究不同施氮水平下内蒙古东部灌区春大麦灌浆期间叶片叶绿素（Chl）含量,叶绿素荧光参数（最大荧光F_m、最大光化学效率F_v/F_m、光化学猝灭系数q_P）,光合参数（净光合速率P_n、气孔导度G_s、蒸腾速率T_r）的动态变化及其相关性。结果表明:随着灌浆时间延长,不同氮肥处理两品种大麦叶片Chl含量、F_m、F_v/F_m、q_P均呈先升高后降低的趋势,P_n、G_s、T_r均呈下降趋势;随着施氮水平升高,叶片Chl含量、F_m、F_v/F_m、q_P、P_n、G_s、T_r均逐渐升高。相关分析结果显示,叶片Chl含量、F_m、F_v/F_m、q_P、P_n、G_s、T_r间均呈极显著正相关关系。显示增施氮肥可促进大麦灌浆期间叶片光合性能。本研究为优质高产大麦生产实践提供理论依据。

Effect of Nitrogen Fertilizer on Photosynthetic Characteristics of Barley during Grain Filling Stage and Its Correlation Analysis

In order to explore the effect of nitrogen fertilizer on the photosynthetic performance of spring barley leaves,this study used Mengpi 3 and Mengpi 5 as materials to study the leaf chlorophyll (Chl) content of spring barley during the grain filling period in eastern Inner Mongolia Irrigation Area under different nitrogen application levels. Chlorophyll fluorescence parameters (maximum fluorescence F_m, maximum photochemical efficiency F_v/F_m,photochemical quenching coefficient q_P), dynamic changes of photosynthetic parameters (net photosynthetic rate P_n, stomatal conductance G_s, transpiration rate T_r) and their correlation. The results showed that with the filling process, the contents of Ch1, F_m, F_v/F_m and q_P of the two varieties of barley increased first and then decreased, and P_n, G_s and T_r showed a downward trend. When the level is increased, the Chl content, F_m, F_v/F_m, q_P, P_n, G_s and T_r of the leaves are gradually increased. Correlation analysis showed that there was a significant positive correlation between Chl content, F_m, F_v/F_m, q_P, P_n, G_s and T_r. It shows that the application of nitrogen fertilizer can promote the photosynthetic performance of the leaves during barley grain filling. This study provide a theoretical basis for the production of high-quality and high-yield barley.