水分胁迫对冬小麦冠层结构及光合特性的研究

Study on Characters in Winter Wheat Canopy Structure under Different Soil Water Stress

冬小麦在不同的水分条件下有不同的表现形式,主要利用CI110植物冠层结构分析仪研究在不同时期的水分胁迫条件下,冬小麦的冠层结构形状的变化。研究结果表明:不同时期进行水分胁迫的处理在冠层光分布中有明显的差异,干旱处理和水分胁迫的处理的叶面积指数小于其它处理,消光系数、叶倾角、散射辐射的穿透系数和直接辐射的穿透系数则大于其它处理;随着时间的变化,冬小麦冠层内的光分布参数在不同水分处理间的差异变的越来越小;光合特性也有明显的差异,干旱处理和水分胁迫处理的光合特性明显低于其它处理的水平;不同时期水分胁迫处理对植株叶片的影响主要集中在植株的中部。

Winter wheat have the different showing under different soil water level, this experiment study the characters in winter wheat canopy structure under different soil water stress during different growing stage using CI-110. The results showed: ① The light distributing in canopy has significant difference under different soil water stress,LAI of the treatments about rain-fed and soil water stress is lower than others, and TDRP, K, TCRP is higher. ② The character of photosynthesis has also significant difference and the treatments has the same showing. ③ The difference of light distributing in canopy changed smaller with time changed. ④ Effect of soil water stress during different stage on winter wheat leaves mainly focus on the middle of plant.