【作者】 刘帆； 申双和； 李永秀； 李丽； 邹学智；

【Author】 LIU Fan1,SHEN Shuang-he1,2,LI Yong-xiu1,2,Li Li1,ZOU Xue-zhi1 (1. Nanjing University of Information Science & Technology, Nanjing, 210044, China ; 2. Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing, 210044,China.)

【机构】 南京信息工程大学； 南京信息工程大学江苏省农业气象重点实验室；

【摘要】 利用遮雨棚以夏玉米为对象进行水分胁迫大田试验,通过分析玉米叶片光合测量数据,研究不同生育期水分胁迫对玉米光合特性的影响,为定量分析不同水分胁迫程度对玉米的可能机理提供数据和初步的理论支持。结果表明:土壤水分下降会使玉米叶片的光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)降低,而胞间CO2浓度(Ci)和水分利用效率(WUE)会增加;Pn随着光照强度的增加而增加,且随着水分胁迫强度增强,Pn增加速率降低;干旱胁迫会改变Pn、Tr日变化规律,并且对拔节期光合作用的抑制小于成熟期;WUE与Pn存在极显著的正相关关系,与Tr、Ci及Gs存在显著的负相关关系。更多还原

【Abstract】 Based on the field experiment in the large moving water proof canopy, the effect of water stress on the photosynthetic characteristics of summer maize in different growth periods and its potential mechanism were analysed via the photosynthetic data of leaves. The results showed that photosynthetic rate(Pn), stomatal conductance(Gs) and Transpiration rate(Tr) were reduced along with the soil moisture, while the intercellular CO2 concentration(Ci) and water use efficiency(WUE) increased. With the rising of PAR, photosynthetic rate was increased, but the increasing rate of Pn was falling due to the decreasing of soil moisture. The diurnal rule of Pn and Tr was changed greatly under water stress, and the decrease at jointing stage was less serious than that at mature stage. WUE was negatively related to Tr, Ci and Gs, while Pn was in opposite way.更多还原