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作 者 ：王红霞;张志华;王文江;高　仪;孙红川

期 刊 ：园艺学报 2005年 32卷 3期 页码：392-396

关键词：核桃；河北核桃；光合特性；

Keywords:Walnut, Juglans hopeiensis Hu, Photosynthetic characteristics,

摘 要 ：以河北核桃‘艺核1号’等为试材, 利用CI-301PS便携式光合作用测定仪, 在田间条件下,研究了河北核桃的光合特性。结果表明: ‘艺核1号’光饱合点为1643 μmol·m^{- 2} ·s^{- 1}左右, 光补偿点为50 μmol·m ^{- 2} ·s^{- 1}左右, 最适温度为29℃; 光合速率日变化为“中午降低型”的双峰曲线; 净光合速率的季节变化为双峰曲线, 第1峰出现在5月中旬, 第2峰出现在8月上旬; 影响光合速率日变化的主要因子依次是气孔导度、光合有效辐射、叶温、胞间CO₂ 浓度和蒸腾速率。河北核桃净光合速率低于普通核桃, 接近于核桃楸。

Abstract:Photosynthetic characteristics of Juglans hopeiensis Hu ‘Yihe 1’were studied by an open gas analysis system of model CI-301PS in the orchard. The results indicated that the light compensation and light saturation points of Juglans hopeiensis Hu were 50 μmol·m^{- 2} ·s^{- 1} and 1643 μmol·m^{- 2} ·s^{- 1} , respectively. The optimum temperature of Pn was 29 ℃. The curve of diurnal variation of Pn in Juglans hopeiensis Hu showed two peaks with a minimum at noon. Two peaks appeared in the curve of seasonal variation of Pn of Juglans hopeiensis Hu, the first peak occurring in May, and the second peak occurring in August. The diurnal change of Pn in Juglans hopeiensis Hu was influenced by stomatal conductance, PAR (photosynthetic available radiation) , leaf temperature, intercellular CO₂ concentration and transpiration rate. The Pn of Juglans hopeiensis Hu were lower than that of English-walnut, and approached that of Manchurian walnut.

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