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OALib Journal期刊
ISSN: 2333-9721
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高温胁迫下不同叶色银杏嫁接苗光响应曲线的拟合
DOI: 10.3969/j.issn.1000-2006.2015.02.003, PP. 14-20
Keywords: 银杏嫁接苗,光饱和点,光补偿点,光响应曲线
Abstract:
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℃)。
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