| 塔里木河下游胡杨气体交换特性及其环境解释 |
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| 引用本文： | 周洪华,陈亚宁,李卫红,陈亚鹏.塔里木河下游胡杨气体交换特性及其环境解释[J].中国沙漠,2008,28(4):665-672. |
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| 作者姓名： | 周洪华 陈亚宁 李卫红 陈亚鹏 |
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| 作者单位： | 中国科学院新疆生态与地理研究所,新疆,乌鲁木齐,830011;中国科学院绿洲生态与荒漠环境重点实验室,新疆,乌鲁木齐,830011 |
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| 基金项目： | 中国科学院"西部之光"人才培养计划
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中国科学院方向性项目
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国家自然科学基金 |
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| 摘 要： | 结合塔里木河下游不同地下水埋深下胡杨的气体交换参数及其环境因子的实测结果,探讨地下水位及环境因子对胡杨光合速率(Pn)、蒸腾速率(Tr)、气孔导度(gs)、水分利用效率(WUE)等气体交换参数的影响规律。研究表明:随着地下水位下降,胡杨净光合速率和蒸腾速率日变化最大值提前,地下水埋深越深,净光合速率“双峰”曲线趋势越明显,地下水位4.37 m以上时,蒸腾速率呈“双峰”曲线,当地下水位下降到5.91 m时,蒸腾速率呈“单峰”曲线；低地下水埋深下,光合作用受抑制的主要原因是气孔限制；随着地下水位下降,光合抑制的主要原因则是非气孔限制；适度水分胁迫有利于提高胡杨水分利用效率\.同时,结果显示: 4 m为胡杨的合理生态水位,地下水位为4~5 m时,胡杨受到轻度水分胁迫,低于6 m,胡杨受水分胁迫加剧。
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| 关 键 词： | 气体交换 地下水埋深 环境因子 胡杨 塔里木河 |
| 收稿时间： | 2007-6-25 |
| 修稿时间： | 2007-8-31 |
Characterization of Photosynthesis of Populus euphratica Oliv and Its Microclimate Explanation in Lower Tarim River |
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| ZHOU Hong-hua,CHEN Ya-ning,LI Wei-hong,CHEN Ya-peng.Characterization of Photosynthesis of Populus euphratica Oliv and Its Microclimate Explanation in Lower Tarim River[J].Journal of Desert Research,2008,28(4):665-672. |
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| Authors: | ZHOU Hong-hua CHEN Ya-ning LI Wei-hong CHEN Ya-peng |
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| Institution: | 1.Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2.Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China |
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| Abstract: | Net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (gs), intercellular CO2 concentration (Ci), air CO2 concentration (Ca), stomatal limitation (Ls), water use efficiency (WUE), photosynthetically active radiation(Par), leaf temperature(Tl), air temperature(Ta), and air relative humidity(RH) of Populus euphratica Oliv grown at different groundwater depths in the Tarim River were measured. With the increasing of groundwater depth the presenting time of the maximum Pn and Tr were advanced. The double-peak curve of Pn is more and more obvious with the increasing of groundwater depth. Tr was double-peak curve when the groundwater depths ≤4.37 m, but it was single-peak curve when the groundwater depth ≥5.91 m. With the increasing of groundwater depth, the predominant cause of restricting photosynthesis from stomatal limitation turned into non-stomatal limitation. Moderate water stress conduced to improve the water use efficiency of Populus euphratica Oliv. The study also showed: 4 m was the rational groundwater table of Populus euphratica Oliv, and when the groundwater depth was 4~5 m, it encountered mild water stress, and if the groundwater depths ≤6 m, the water stress became severe. |
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| Keywords: | gas exchange groundwater depths microclimate factors Populus euphratica Oliv Tarim River |
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