论文部分内容阅读
笔者在大田条件下,研究了冬小麦叶片表亡过程及其对碳氮营养的反应。单叶表亡时,由叶尖向基部渐次变黄并干枯,叶片含水率、叶绿素和可溶性蛋白质含量逐渐降低,标志膜透性的叶片浸出液的电导率增加,叶片结构逐渐解体。叶片衰亡过程呈“S”型曲线,可划分为缓慢衰亡、快速衰亡和失水枯死三个阶段。氮肥的作用只能延长叶片功能期,预防和延缓表亡的开始。叶片等营养器官的正常衰亡,对粒重形成有积极意义。
Under field conditions, the author studied the process of leaf death and its response to carbon and nitrogen nutrition in winter wheat. When single leaves died, the leaves gradually yellowed and dried up from the tip to the base, and the leaf water content, chlorophyll content and soluble protein content gradually decreased. The conductivity of the leaf leachate that marked membrane permeability increased and the leaf structure gradually disintegrated. The process of leaf decay is “S” curve, which can be divided into three phases: slow decay, rapid decay and water loss. The role of nitrogen fertilizer can only extend the functional period of leaves, to prevent and delay the beginning of death. Leaf and other vegetative organs of the normal decline, the formation of grain weight has a positive meaning.