| 海北高寒草甸矮嵩草光合日变化及与环境因子的关系 |
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| 引用本文： | 易现峰,杨月琴,贲桂英.海北高寒草甸矮嵩草光合日变化及与环境因子的关系[J].青海草业,1999(2). |
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| 作者姓名： | 易现峰 杨月琴 贲桂英 |
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| 作者单位： | 中国科学院西北高原生物研究所 |
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| 摘 要： | 对海北高寒草甸矮嵩草光合放氧以及光照、温度和湿度等环境因子的测定结果表明，矮嵩草从早晨８：００便表现出明显的光合作用之后并缓慢上升。净光合速率至中午１２：００时达到最大，１４：００时有所下降，出现“午休”（Ｍｉｄｄａｙｄｅｐｒｅｓｉｏｎ）现象，而后又逐渐上升。表观光合量子效率在１４：００有所下降；暗呼吸速率在一天当中保持上升趋势，只是下午１８：００有所下降，与温度和相对湿度分别呈现正、负相关关系。净光合速率、表观光合量子效率和暗呼吸的速率日变化与环境因子（光照、空气温度和湿度等）有密切的关系。
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| 关 键 词： | 高寒草甸 矮嵩草 光合作用“午休” 表观光合量子效率 |
STUDY ON DIURNAL VARIATION IN PHOTOSYNTHESIS AND ITS RELATION TO ENVIRONMENTAL FACTORS OF KOBREAIA HUMILIS IN HAIBEI ALPINE MEADOW ECOSYSTEM |
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| YI Xian-feng, YANG Yue-qin, BEN Gui-ying.STUDY ON DIURNAL VARIATION IN PHOTOSYNTHESIS AND ITS RELATION TO ENVIRONMENTAL FACTORS OF KOBREAIA HUMILIS IN HAIBEI ALPINE MEADOW ECOSYSTEM[J].Qinghai Prataculture,1999(2). |
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| Authors: | YI Xian-feng YANG Yue-qin BEN Gui-ying |
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| Institution: | The Northwest Plateau Institute of Biology The Chinese Academy of Sciences Xining 810001 |
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| Abstract: | Study on diurnal variation in photosynthesis and its relation to environmental factors of kobresia humilis in Haibei Alpine Meadow Ecosystem indicated that photosynthetic rate and apparent quantum yield (AQY) increased from 8:00 AM to 12:00AM, then declined at 14:00 PM and increased again till 18:00 PM. The phenomenon of midday depression apparently exhibited and was closely related to environmental factors, such as light, temperature, humidity and so on. |
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| Keywords: | Alpine meadow kobresia humilis Photosynthetic Midday depression Apparent photosynthetic yield |
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