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作 者 ：敖　红;张　羽

期 刊 ：植物研究 2007年 27卷 4期 页码：445-448

关键词：红皮云杉；嫩江云杉；水分胁迫；光合特征；

Keywords:Picea koraiensis Nakai, Picea koraiensis Nakai var. nenjiangensis S.Q.Nie et X.Y.Yuan, water stress, photosynthetic characteristics,

摘 要 ：比较研究了3年生红皮云杉和嫩江云杉苗木在不同水分条件下的光合特征，并探讨其对水分胁迫的适应机制。研究结果表明，不同光强下两种云杉的最大光合速率（P_max）随土壤含水量的降低而逐渐下降，且嫩江云杉的降幅较小；表观量子效率（AQY）、蒸腾速率（Tr）、气孔导度（G_s）也都呈下降的趋势。暗呼吸速率（R_d）和水分利用率（WUE）在逐渐干旱的过程中先上升后下降，而胞间CO₂浓度先下降，后随上升。这表明在水分胁迫较为严重时，光合速率的降低主要是非气孔限制造成的。比较上述指标的变化情况可以看出，嫩江云杉对干旱的适应性要强于红皮云杉。

Abstract:Photosynthetic characteristics of 3-years-old Korean spruce and Nenjiang spruce seedlings were studied under different water conditions in order to explore their adaptation mechanism to water stress. The results showed that maximum photosynthetic rate（P_max）under different light reduced with the reducing of soil moisture content, and the reduction of Nenjiang spruce is smaller; apparent quantum yield (AQY),transpiration rate(Tr), stomatal conductance (G_s) also decreased. Dark respiration rate（R_d）and water use efficiency（WUE） rised firstly and then descended as drought become intensified, however, intercellular (C_i)descended firstly then rised. These results showed that photosynthesis was limited by non-stomatal factor under serious drought. It is indicated that the ability to water stress of Nenjiang spruce is stronger than that of Korean spruce by comparing above indexes.

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