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选取采自同一银杏植株上黄叶及绿叶银杏的2年生嫁接苗,通过测定不同温度下黄叶及绿叶银杏光响应曲线,采用4种常用模型(直角双曲线模型、非直角双曲线模型、指数模型和改良直角双曲线模型)分别拟合响应曲线并计算相关参数。结果表明,改良直角双曲线模型为银杏光响应曲线拟合的最优模型。同时,比较不同温度下嫁接苗光合参数(改良直角双曲线模型)发现:在相同温度下,黄叶银杏的光饱和点及最大净光合速率(Pn,max)显著低于绿叶银杏;当温度升高至阈值时,表观量子效率(Φ)、暗呼吸速率(RD)和光补偿点显著下降,黄叶银杏温度阈值(4月时为≥28℃,7月时为≥38℃)明显低于绿叶银杏(4月时为≥30℃,7月时为≥40℃)。
Two-year-old grafted seedlings of yellow ginkgo and ginkgo were collected from the same ginkgo plant. The light response curves of yellow ginkgo and ginkgo were determined by using four commonly used models (right angle hyperbola model, non-right angle hyperbola model, Model and modified rectangular hyperbolic model) fit the response curve and calculate the relevant parameters. The results show that the modified rectangular hyperbolic model is the best model for the fitting of the light response curve of ginkgo. At the same time, comparing the photosynthetic parameters of grafted seedlings (improved rectangular hyperbola model) at different temperatures, it was found that under the same temperature, the light saturation point and maximum net photosynthetic rate (Pn, max) of Ginkgo biloba leaves were significantly lower than those of Ginkgo biloba leaves. Apparent quantum efficiency (Φ), dark respiration rate (RD) and light compensation point decreased significantly up to the threshold value. The temperature threshold (≥ 28 ℃ in April and ≥ 38 ℃ in July) of P. ginkgo significantly decreased Ginkgo biloba (≥ 30 ° C in April and ≥ 40 ° C in July).