干旱区生态环境知识资源中心(Arid): 几种荒漠植物对干旱过程的生理适应性比较

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	几种荒漠植物对干旱过程的生理适应性比较
其他题名	Comparison of Physiological Adaptabilities of Several Dersert Plants to Drying Stress
	柏新富 1; 朱建军 1; 赵爱芬 1; 苏培玺2 ; 卜庆梅 1; 赵雪 1
ISSN	1006-687X
出版年	2008
卷号	14 期号:6 页码:763-768
中文摘要	在甘肃临泽实地取样进行试验,比较了胡杨、花棒和梭梭等荒漠植物离体枝条的光合、蒸腾作用对组织水势降低的响应,以探讨其对干旱过程的适应性.结果显示,梭梭在-2～-5.5MPa、胡杨在-1～-4.5MPa的枝叶水势下具有较高的光合速率和水分利用效率,花棒和二白杨则在水势低于-2MPa时光合速率和水分利用效率均显著下降;同时,梭梭的最大蒸腾速率不足2mmol m-2s-1,而同样条件下胡杨和二白杨的最大蒸腾速率则在4～6mmol m-2s-1.因此,几种荒漠植物中,梭梭最能够适应干旱荒漠环境;胡杨因蒸腾失水较多而对环境水分有较强的依赖性,适应极端干旱的能力不及梭梭;花棒虽具有蒸腾耗水少的特点,但因在环境严重缺水时光合效率低而影响了其对荒漠的适应能力.
英文摘要	Experiments were carried out in Linze, Gansu Province for comparings the responses of photosynthesis and transpiration to the decline in water potential of the detached twigs of Haloxylon ammodendron, Hedysarum scoparium, Populus euphratica with reference to a mesophyte Gansu popular, and studying their physiological adaptabilities to drying stress. The results indicated that H. ammodendron and P. euphratica could maintain a higher photosynthetic rate and higher water use efficiency at tissue water potentials of -2～-5.5 MPa and -1～-4.5 MPa, respectively, while H. scoparium and P. gansuensis showed higher photosynthetic rate and higher water use eff iciency only when the tissue water potentials were above -2 MPa. In contrast to the maximum transpiration rate of 4～6 mmol m-2 s-1 in P. euphratica and P. gansuensis, the maximum transpiration rate in H. ammodendron was just less than 2 mmol m-2 s-1 under favourable conditions. It is concluded that among the tested plants, H. ammodendron was maximally adapted to desert environment; P. euphratica could not match the high adaptability of H. ammodendron because of its dependence on the available water supply. Although the transpiration and water loss in H. scoparium were low, its desert adaptability was confi ned due to its low photosynthetic eff iciency when the drying stress was severe.
中文关键词	荒漠植物 ; 胡扬 ; 花棒 ; 梭梭 ; 水势 ; 干旱 ; 光合作用 ; 蒸腾作用 ; 水分利用效率
英文关键词	desert plant Haloxylon ammodendron Hedysarum scoparium Populus euphratica water potential drought photosynthesis transpiration water use efficiency
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:3459865
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/2XILL650/223006
作者单位	1.鲁东大学生命科学学院鲁东大学, 烟台, 山东 264025, 中国; 2.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	柏新富,朱建军,赵爱芬,等. 几种荒漠植物对干旱过程的生理适应性比较[J]. 中国科学院西北生态环境资源研究院,2008,14(6):763-768.
APA	柏新富,朱建军,赵爱芬,苏培玺,卜庆梅,&赵雪.(2008).几种荒漠植物对干旱过程的生理适应性比较.,14(6),763-768.
MLA	柏新富,et al."几种荒漠植物对干旱过程的生理适应性比较".14.6(2008):763-768.