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岩黄连光合与蒸腾特性及其对光照强度和CO_2浓度的响应
韦记青;蒋水元;唐辉;蒋运生;漆小雪;王满莲;
1.广西壮族自治区中国科学院广西植物研究所;2.广西壮族自治区中国科学院广西植物研究所 广西桂林541006;3.广西桂林541006
摘要:
采用LI-6400便携式光合测定系统(Li-CorInc.,USA)对岩黄连叶片的气体交换进行了测定。结果表明(1)岩黄连叶片的光饱和点(LSP)为329.18μmol.m-2.s-1左右,光补偿点(LCP)为12.76μmol.m-2.s-1,最大净光合速率为2.96μmol.m-2.s-1,暗呼吸速率(Rd)为0.17μmol.m-2.s-1。光饱和点和光补偿点都比效低,表明岩黄连对光照的要求不高,属于阴生植物。(2)4月份,岩黄连Pn随CO2浓度升高而逐渐增大。当CO2浓度由50μmol.mol-1增加到600μmol.mol-1,Pn几乎呈直线上升,600~1000μmol.mol-1...
关键词:  净光合速率    水分利用效率    光响应曲线    CO_2响应曲线
DOI:
分类号:
Fund project:广西科技攻关项目(桂科攻0235022-5)~~
Abstract:
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