田间条件下核桃光合特性的研究  

Studies on Photosynthetic Characteristics of English-walnut in the Field

作　　者：王红霞[1] 张志华[1] 王文江[1] 孙红川 

机构地区：[1]河北农业大学山区研究所,河北保定071001 [2]定州市林业局,河北定州073000

出　　处：《华北农学报》2007年第2期125-128,共4页Acta Agriculturae Boreali-Sinica

基　　金：河北省自然科学基金资助项目(303228);"十一五"国家科技支撑计划项目(2006BAD18B02)

摘　　要：以普通核桃品种清香为主要试材,利用CI-301PS便携式光合作用测定仪系统,在田间条件下,研究了核桃的光合特性。结果表明:核桃光饱和点为1 610μmol/(m2.s)左右,光补偿点为40μmol/(m2.s)左右,光合最适温度为27℃;核桃的光合日变化为双峰曲线,有明显的“光合午休”现象;核桃光合季节变化为单峰曲线,最高峰出现在5月中旬。影响核桃光合日变化的主要因子依次是胞间CO2浓度、叶温、气孔导度、光合有效辐射和蒸腾速率;不同品种间净光合速率有明显差异。Studies were carried out on photosynthetic characteristics of English-walnut using a portable infrared gas analyser（CI-301PS）. The results indicated that the light compensation and light saturation points of English-walnut were 40 and 1 610 umol/（m^2· s） respectively. The optimum temperature of Pn was at 27 ℃. The curve of diurnal variation of English-walnut showed two peaks, and there was obvious ＂midday rest＂. Single peaks appeared in the curve of seasonal variation of Pn of English-walnut, with the peak occurring in May. The diurnal change of Pn in English-walnut was influenced by intercellular CO2 concentration, leaf temperature, stomata conductance, photosynthetic available radiation, and transpiration rate. There were significant differences in Pn of English-walnut cultivars.

关 键 词：核桃 光饱和点 光补偿点 日变化 季节变化 影响因子 

分 类 号：S664.101[农业科学—果树学]