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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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长白山不同海拔岳桦（betulaermanii）的光合生理
DOI: 10.3724/SP.J.1145.2012.00553, PP. 553-558
Keywords: 岳桦,海拔,ppfd,ci,光合生理,高山植物,长白山
Abstract:
通过研究不同海拔（1750m，1900m，2000m）岳桦的光合生理，探讨岳桦叶片对高山环境的适应特征.结果表明：与海拔1750m相比，1900m和2000m处植物叶片具有较低的暗呼吸速率（rd）、光补偿点（lcp）和co2补偿点（ccp），较高的最大光合速率（amax）、光近饱和点（lk）、表观羧化速率（ce）、最大羧化速率（vcmax）和最大电子传递速率（jmax）.1900m处光化学淬灭系数（qp）和作用光存在时psⅱ实际光化学量子效率（фpsⅱ）最高，2000m处非光化学淬灭系数（npq）则最高.随海拔升高，岳桦叶片水分利用效率（wue）先升高再降低.与1750m相比，1900和2000m处植物叶片具有较高的气孔导度（gs）和co2吸收速率（pn/ci斜率）.分析表明：1900m是岳桦的最适生长区，具有较高的光合能力，且所受胁迫较小.图6表3参26
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