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作 者 ：荆家海;马书尚

期 刊 ：作物学报 1990年 16卷 04期 页码：342-348

关键词：水分胁迫；蒸腾速率；净光合速率；气孔导度；叶水势；

Keywords:Water stress, Transpiration rate, Net photosynthesis rate, Stomatal conductance, Leaf water potential,

摘 要 ：四种作物叶片气体交换特性对水分胁迫的反应不同。高叶水势下,气孔阻力低,净光合速率是玉米>旱稻>豇豆>棉花,而蒸腾速率是棉花>豇豆>旱稻>玉米。气孔阻力对轻度水分亏缺无反应。随着水分胁迫加剧,叶水势达到某一阈值,气孔阻力突然增加。气孔开始关闭水势阈值分别为:-0.8(玉米)、-0.4(豇豆)、-1.2MPa(旱稻、棉花)。净光合速率

Abstract:The responses of the gas exchange characteristics of leaves of 4 different crops towater stress are different.Under high water potential and low stomatal resistance,theorder of the P_N of the crops was maize>upland rice>cowpea>cotton,whereas that ofTR was cotton>cowpea>upland rice>maize.There was no

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