| 不同生育期水分胁迫对玉米光合特性的影响 |
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| 引用本文： | 刘帆,申双和,李永秀,李丽,邹学智. 不同生育期水分胁迫对玉米光合特性的影响[J]. 气象科学, 2013, 33(4): 378-383 |
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| 作者姓名： | 刘帆 申双和 李永秀 李丽 邹学智 |
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| 作者单位： | 1. 南京信息工程大学,南京,210044
2. 南京信息工程大学,南京 210044;南京信息工程大学江苏省农业气象重点实验室,南京 210044 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)项目 |
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| 摘 要： | 利用遮雨棚以夏玉米为对象进行水分胁迫大田试验,通过分析玉米叶片光合测量数据,研究不同生育期水分胁迫对玉米光合特性的影响,为定量分析不同水分胁迫程度对玉米生育的可能机理提供数据和初步的理论支持.结果表明:土壤水分下降会使玉米叶片的光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)降低,而胞间CO2浓度(Ci)和水分利用效率(WUE)会增加;Pn随着光照强度的增加而增加,且随着水分胁迫强度增强,Pn增加速率降低;干旱胁迫会改变Pn、Tr日变化规律,并且对拔节期光合作用的抑制小于成熟期;WUE与Pn存在极显著的正相关关系,与Tr、Ci及Gs存在显著的负相关关系.
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| 关 键 词： | 水分胁迫 玉米 光合速率 水分利用效率 |
| 收稿时间： | 2012-02-17 |
| 修稿时间： | 2012-05-02 |
Effect of water stress on maize photosynthetic characteristics in different growth stages |
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| LIU Fan,SHEN Shuanghe,LI Yongxiu,LI Li and ZOU Xuezhi. Effect of water stress on maize photosynthetic characteristics in different growth stages[J]. Journal of the Meteorological Sciences, 2013, 33(4): 378-383 |
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| Authors: | LIU Fan SHEN Shuanghe LI Yongxiu LI Li ZOU Xuezhi |
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| Affiliation: | Nanjing University of Information Science & Technology, Nanjing 210044, China;Nanjing University of Information Science & Technology, Nanjing 210044, China;Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China;Nanjing University of Information Science & Technology, Nanjing 210044, China;Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China;Nanjing University of Information Science & Technology, Nanjing 210044, China;Nanjing University of Information Science & Technology, Nanjing 210044, China |
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| Abstract: | Based on the field experiment in the large moving water proof canopy, the effect of water stress on the summer maize photosynthetic characteristics in different growth stages and its potential mechanism were analysed by the leaves photosynthetic data. The results showed that photosynthetic rate(Pn), stomatal conductance(Gs) and transpiration rate(Tr) reduced along with the soil moisture decrease, while the intercellular CO2 concentration(Ci) and water use efficiency(WUE) increased. With the rising of PAR(photosynthetically active radiation), photosynthetic rate increased, but the increasing rate of Pn tended to weaken due to the decreasing of soil moisture. The diurnal rule of Pn and Tr changed greatly because of water stress, and the decreasing in jointing stage was less serious than that in maturing stage. An evident positive correlation was found between WUE and Pn, but the negative correlation between WUE and Tr, Ci, Gs is obvious. |
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| Keywords: | Water stress Maize Photosynthetic rate Water use efficiency |
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