不同土壤水分下小麦幼苗出土幼苗生长及叶片光合作用的变化

• 作 者: 刘孟雨 陈培元
• 出 处: 中国科学院西北水土保持研究所集刊
• 发表日期: 1988年02期
• 关键词: 土壤水分 幼苗 幼苗出土 土壤水势 土壤水分亏缺 最大持水量 土壤含水量 叶片光合作用 气孔导度 叶片光合

本文研究了不同土壤水分下小麦(小偃6号)幼苗出土及幼苗生长的变化,结果表明,轻微的土壤水分亏缺使根的伸长加快,根量增加;严重的土壤水分亏缺使根和幼苗生长受抑,干旱下根/冠比增大。土壤水势低于1.80MPa 时,幼苗几平不能出土。土壤水势在—0.61MPa 时,形成的苗既小又弱,形成弱小苗的原因是叶片光合能力下降、呼吸增加的结果。根据实验结果本文提出,小偃6号向较旱区推广是一慎重的问题。

In this paper, the changes of soilless seedling emergence and seedling growth of wheat (Xiaoyan 6) under different soil moisture contents were studied. The results showed that slight soil water deficit accelerated root elongation and increased root volume. Severe soil water deficit caused root And seedling growth was inhibited, the root / crown ratio increased under drought. When the soil water potential is lower than 1.80MPa, seedlings can not be unearthed several times. Soil water potential at -0.61MPa, the formation of seedlings are small and weak, the formation of weak seedlings is due to decreased photosynthetic capacity, increased respiration results. According to the experimental results, this paper proposes that it is a prudent issue to promote Xiaoyan 6 to arid areas.