不同灌水处理对冬小麦冠层结构及光合特性的影响

摘要

Irrigation treatments are conducted in different growth stages of winter wheat to study their effects on win-ter wheat canopy structure, photosynthetic character and yield. The results show that two irrigation treatment (in winter period and jointing stage) the chlorophyll content and LAI of winter wheat always maintain a high level in the whole growth period, while they show an inverted "V"-type in the early filling stage and flowering stage. The effects of irriga-tion treatments on the DIFN are in opposite to the trends of LAI changes. Two irrigation treatment the winter wheat flag leaf net photosynthetic rate, stomatal conductance and transpiration rate increase more significantly compared to one irrigation treatment(in winter or jointing stage), and intercellular CO_2 concentration decreases. The yield of all three varieties of P12, 138 and M808 reaches the maximum in the two irrigation treatment, reaching 5 045 kg/hm~2, 5 516 kg/hm~2 and 5 479 kg/hm~2, respectively.%通过对冬小麦不同生育时期进行灌水处理,研究了灌水处理对冬小麦冠层结构、光合特性及产量的影响.结果表明,两水处理(越冬期和拔节期)的冬小麦叶绿素含量和叶面积指数,在全生育期内始终保持较高水平,且分别在开花期和灌浆初期呈现倒"V"型.灌水处理对透光率的影响与叶面积指数的变化趋势相反;两水处理(越冬期和拔节期)的冬小麦旗叶净光合速率、气孔导度和蒸腾速率与一水处理(越冬期或者拔节期)相比显著提高,胞间CO_2浓度则降低.P12、138和米808三个品种产量均是两水处理(越冬期和拔节期)最高,分别达到5 045、5 516、5 479 kg/hm~2.