干旱区生态环境知识资源中心(Arid): 极端干旱区胡杨水势及影响因子研究

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	极端干旱区胡杨水势及影响因子研究
其他题名	Leaf Water Potential of Populus euphratica and Influencinge Factors in Extreme Arid Region
	司建华; 冯起; 张小由
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2005
卷号	25 期号:4 页码:505-510
中文摘要	依据2002年4月至2003年9月在极端干旱区额济纳旗的观测资料,对胡杨叶水势的日、季变化规律及影响因子进行了分析研究.试验结果表明:胡杨叶水势日变化均值为(-2.86士0.75)MPa,季变化均值为(-2.720.14)MPa.叶水势日、季节变化曲线呈单峰型,这种变化规律是胡杨适应该地区生境的生理特性之一.对胡杨不同部位和不同叶型的叶水势测定结果表明,上部的叶水势比下部低,披针叶的叶水势比阔卵叶的叶水势高,这与水分移动的规律相符合.胡杨叶水势的日、季变化与气温、大气相对湿度、辐射照度间有十分显著的相关关系.与土壤水分间也有十分显著的相关关系,土壤含水量下降,蒸腾加快,叶水势降低,土壤含水量增加,蒸腾减弱,叶水势回升.
英文摘要	Based on the data observed at Ejin Banner from April of 2002 to September of 2003, the daily and seasonal variations of leaf water potential of Populus euphratica and related factors were analyzed. The daily and seasonal average water potential were ( - 2. 860.75)MPa and ( - 2.72 + 0.14)MPa, respectively. The variations were obvious and single-peak curves could be observed. This was a combined function of both internal and external factors, and reflected one of physiological characteristics of Populus euphratica adaptable to the local site. The study on the daily change of leaf water potential in different position and different leaf shape of Populus euphratica showed that, the downside water potential was higher than the up-side, and that of willow leaf was higher than that of poplar leaf. These accord with water transport rule. Close correlation could be found between the variation of leaf water potential and temperature, relative humidity, illumination. Water potential has a negative, correlation to air temperature and intensity of illumination, and a positive correlation to air humidity. Evident correlation existed between the variation of leaf water potential Un soil moisture. The transpiration went up and the water potential went down while the soil moisture decreased, the water potential was still lower when the transpiration and the soil moisture increased, however, the water potential recovered when the transpiration decreased. This provides a scientific basis for understanding water situation in the body of Populus euphratica and selecting physiological indicators for rational irrigation.
中文关键词	胡杨 ; 叶水势 ; 日、季变化 ; 影响因子
英文关键词	Populus euphratica leaf water potential daily and seasonal variation influence 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:2002798
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/2XILL650/206993
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,冯起,张小由. 极端干旱区胡杨水势及影响因子研究[J]. 中国科学院西北生态环境资源研究院,2005,25(4):505-510.
APA	司建华,冯起,&张小由.(2005).极端干旱区胡杨水势及影响因子研究.中国沙漠,25(4),505-510.
MLA	司建华,et al."极端干旱区胡杨水势及影响因子研究".中国沙漠 25.4(2005):505-510.