干旱区生态环境知识资源中心(Arid): 胡杨叶片气孔导度特征及其对环境因子的响应

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	胡杨叶片气孔导度特征及其对环境因子的响应
其他题名	Stomatal Conductance Characteristics of Populus euphratica Leaves and Response to Environmental Factors in the Extreme Arid Region
	司建华; 常宗强; 苏永红; 席海洋; 冯起
ISSN	1000-4025
出版年	2008
卷号	28 期号:1 页码:125-130
中文摘要	依据2005年对极端干旱区荒漠河岸林胡杨的观测资料，对胡杨气孔运动进行了分析研究以揭示胡杨的水分利用特征与抗旱机理。结果表明：（1）胡杨叶片气孔导度日变化呈现为周期波动曲线，其波动周期为2h，傍晚（20：00）波动消失；净光合速率和蒸腾速率与气孔导度的波动相对应而呈现同步周期波动。（2）胡杨的阳生叶气孔导度高于阴生叶，且不同季节气孔导度值不同，阳生叶气孔导度的季节变幅大于阴生叶。（3）胡杨气孔导度与气温、相对湿度和叶水势有显著相关关系，当CO_2浓度较小时，胡杨气孔导度随CO_2浓度的增加而增加，当CO_2浓度达到一定值后气孔导度不再增加，反而随CO_2浓度的增加大幅度降低。（4）胡杨适应极端干旱区生境的气孔调节机制为反馈式反应，即由于叶水势降低导致气孔导度减小，从而减少蒸腾耗水，达到节约用水、适应干旱的目的，表明胡杨的水分利用效率随气孔限制值的增大而减小，二者呈显著负相关。
英文摘要	According to the observed data of Populus euphratica which growing in extreme arid environment in 2005,the gas exchange characteristics of P. euphratica were studied under natural condition by using a portable Li-6400 photosynthesis system. The results showed that：the oscillations of stomatal conductance in P. euphratica leaves took place in the diurnal course in hot and bright sunny day with an oscillation periodicity of about 2 h, and disappeared after 20.00. The assimilation and transpiration, associated with stomatal conductance,exhibited and sustained oscillations in the diurnal course simultaneously. Stomatal conductance is higher in leaves of sunny positions than that of shade positions of P. euphratica. Stomatal conductance of P. euphratica has significant correlation with temperature, relative humidity and leaf water potential. When CO_2 concentration is lower, the stomatal conductance of P. euphratica increment with the CO_2 concentration rises. However, when CO_2 concentration attained a certain value, the stomatal conductance was no longer increase. If CO_2 concentration continued to goes up, the stomatal conductance would significantly reduces with the CO_2 concentration rising. It was feedback manner that mechanism of stomatal adjustment of P. euphratica adapting habit of extreme arid region,namely to fall leaf water potential cause stomatal conductance to decrease, which reduced water consumption from transpiration to save water and adapt drought. Water utilization efficiency （WUE） of P. euphratica increased with stomatal limitation value decreasing,vice versa,it will increase. These results provided scientific basic for understanding drought resistan t mechanism and improving water utilization efficiency of P. euphratica.
中文关键词	胡杨 ; 气孔导度 ; 影响因子
英文关键词	Populus euphratica Oliv. stomatal conductance environmental factors
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3228153
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222927
作者单位	中国科学院寒区旱区环境与工程研究所, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	司建华,常宗强,苏永红,等. 胡杨叶片气孔导度特征及其对环境因子的响应[J]. 中国科学院西北生态环境资源研究院,2008,28(1):125-130.
APA	司建华,常宗强,苏永红,席海洋,&冯起.(2008).胡杨叶片气孔导度特征及其对环境因子的响应.,28(1),125-130.
MLA	司建华,et al."胡杨叶片气孔导度特征及其对环境因子的响应".28.1(2008):125-130.