| 晴天和阴天对刺槐光合生理特性的影响 |
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| 引用本文： | 郑元,赵忠,周慧,周靖靖.晴天和阴天对刺槐光合生理特性的影响[J].林业科学,2011,47(5). |
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| 作者姓名： | 郑元 赵忠 周慧 周靖靖 |
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| 作者单位： | 西北农林科技大学,西部环境与生态教育部重点实验室,杨凌712100 |
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| 基金项目： | 国家"十一五"科技支撑计划项目 |
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| 摘 要： | 以渭北地区刺槐为研究对象,采用LI-6400便携式光合作用系统,于2009年6月和8月分别在晴天和阴天条件下,测定刺槐光合作用的日进程及光合光响应曲线.结果表明:无论在6月还是8月,晴天刺槐的净光合速率(Pn)和气孔导度(Ga)在10:00以前高于阴天,而在午间12:00和14:00低于阴天.刺槐的胞间CO2浓度(Ci)、空气CO2浓度(Ca)、空气相对湿度(RH)、光能利用率(LUE)在晴天的绝大多数时间显著低于阴天,而蒸腾速率(Tr)、水汽压亏缺(VPD)、光合有效辐射(PAR)、空气温度(Ta)在晴天的全天都显著高于阴天.在晴天条件下,虽然刺槐的Ga,Ci,Ca,RH,LUE的日均值比阴天低,但Pn,Tr,VPD,PAR,Ta的日均值比阴天高,从而能够积累更多的日均光合固碳量.在阴天条件下,刺槐的最大光合速率(Pmax)高于晴天,且暗呼吸速率(Rd)和光补偿点(LCP)显著低于晴天,表现出很强的光合适应能力.
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| 关 键 词： | 刺槐 光合作用 晴天 阴天 光能利用率 |
Effects of Sunny and Cloudy Days on Photosynthetic and Physiological Characteristics of Black Locust |
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| Zheng Yuan,Zhao Zhong,Zhou Hui,Zhou Jingjing.Effects of Sunny and Cloudy Days on Photosynthetic and Physiological Characteristics of Black Locust[J].Scientia Silvae Sinicae,2011,47(5). |
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| Authors: | Zheng Yuan Zhao Zhong Zhou Hui Zhou Jingjing |
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| Institution: | Zheng Yuan Zhao Zhong Zhou Hui Zhou Jingjing(Key Laboratory of Environment and Ecology in Western China of Ministry of Education Northwest A & F University,Yangling 712100) |
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| Abstract: | Diurnal course and light response curves of photosynthesis in the Black locust Robinia pseudoacocia in Weibei region were measured using a LI-6400 portable photosynthesis system under sunny and cloudy days in June and August 2009.Regardless in June or in August,the net photosynthetic rate(Pn) and stomatal conductance(Gs) of Black locust under the sunny days were higher than those under the cloudy days before 10:00,while both of them were lower between 12:00 and 14:00.The intercellular CO2 concentration(Ci),... |
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| Keywords: | Robinia pseudoacacia photosynthesis sunny day cloudy day light use efficiency |
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