Relationship between Diurnal Changes of Alfalfa Net Photosynthetic Rate and Environmental Factors

doi:10.11733/j.issn.1007-0435.2009.01.006

›› 2009, Vol. 17 ›› Issue (1): 27-31.DOI: 10.11733/j.issn.1007-0435.2009.01.006

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Relationship between Diurnal Changes of Alfalfa Net Photosynthetic Rate and Environmental Factors

WAN Su-mei^1,2, JIA Zhi-kuan², YANG Bao-ping²

1. College of Plant Sciences, Tarim University, Alar, Xinjiang Uygur Autonomous Region 843300, China;
2. Research Center of Dryland Farming In Arid and Semi-arid Area, Northwest A & F University, Yangling, Shaanxi Province 712100, China

Received:2008-04-22 Revised:2008-12-11 Online:2009-02-15 Published:2009-02-15

苜蓿光合速率日变化及其与环境因子的关系

万素梅^1,2, 贾志宽², 杨宝平²

1. 塔里木大学植物科技学院, 新疆, 阿拉尔, 843300;
2. 西北农林科技大学干旱半干旱农业研究中心, 陕西, 杨凌, 712100

通讯作者: 贾志宽,Author for correspondence,E-mail:zhikuan@tom.com
作者简介:万素梅(1968- ),女,新疆人,教授,博士,主要从事旱区节水及农业资源管理与维护科研工作,E-mail:wansumei510@163.com
基金资助:
国家“十一五”科技支撑计划(2006BAD29B03);农业部农业结构调整重大技术研究专项项目(2002-09-02A)

Abstract

Abstract: In order to identify the relationship between diurnal changes of photosynthetic rate and environmental factors of Alfalfa(Medicago sativa L.cv.Zhenyuan),photosynthetic characteristics were monitored using portable LI-6400 photosynthesis system.The results show that the curves of diurnal variation in Pn(net photosynthetic rate) and Tr(transpiration rate) had two peaks and an obvious midday depression at 12:00 O′clock.The Pn peaks were detected at 10:00 am and 13:00 pm and reached to 33.55 μmol CO₂·m^-2·s^-1 and 27.88 μmol CO₂·m^-2·s^-1,respectively;the first peak was higher than the second.The Tr peaks were detected at 11:00 am and 14:00 pm and 1 hour behind those of Pn.Pn was significantly positively correlated with PAR(photosynthetically available radiation;r=0.8433^**) and Gs(stomatal conductance;r=0.8223^**) and significantly negatively correlated with Ci(intercellular CO₂ concentration;r=-0.8125 ^**).Ci was the major environmental factor influencing diurnal changes of the Pn of alfalfa.

Key words: Alfalfa, Photosynthetic rate, Diurnal change, Environmental factor, Stomatal conductance

摘要： 利用LI-6400光合仪测定苜蓿叶片净光合速率,研究其日变化及与环境因子的关系。结果表明:苜蓿叶片净光合速率、蒸腾速率日变化均呈现"双峰"曲线,有明显的光合"午休"现象;净光合速率峰值出现在10:00和13:00,分别为33.55和27.88μmol CO₂·m^-2·s^-1,第1峰值大于第2峰值;蒸腾速率的峰值出现在11:00和14:00,比光合速率滞后1小时;相关分析表明,苜蓿净光合速率与光合有效辐射、气孔导度呈极显著正相关(r=0.8433^**、0.8223^**),与田间CO₂浓度呈极显著负相关(r=-0.8125^**);在光照强度、CO₂浓度、气温和空气湿度4个环境因子中,影响净光合速率日变化的主要因子是田间CO₂浓度。

关键词: 苜蓿, 光合速率, 日变化, 环境因子, 气孔导度

CLC Number:

Q945.43

WAN Su-mei, JIA Zhi-kuan, YANG Bao-ping. Relationship between Diurnal Changes of Alfalfa Net Photosynthetic Rate and Environmental Factors[J]. , 2009, 17(1): 27-31.

万素梅, 贾志宽, 杨宝平. 苜蓿光合速率日变化及其与环境因子的关系[J]. , 2009, 17(1): 27-31.

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Relationship between Diurnal Changes of Alfalfa Net Photosynthetic Rate and Environmental Factors

苜蓿光合速率日变化及其与环境因子的关系

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