Studies on Photosynthetic Characteristics of English-walnut in the Field

doi:10.3321/j.issn:1000-7091.2007.02.030

Abstract

Abstract: 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 1610 μmol/(m²·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.

Key words: English-walnut, Light saturation point, Light compensation point, Diurnal variation, Seasonal variation, Affecting factor

CLC Number:

S664.101

WANG Hong-xia, ZHANG Zhi-hua, WANG Wen-jiang, SUN Hong-chuan. Studies on Photosynthetic Characteristics of English-walnut in the Field[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2007, 22(2): 125-128. doi: 10.3321/j.issn:1000-7091.2007.02.030.

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