干旱区生态环境知识资源中心(Arid): 塔干南缘骆驼刺植被水分关系的研究

Arid

	塔干南缘骆驼刺植被水分关系的研究
其他题名	Water Relations on Alhagi sparsifolia in the Southern Fringe of Taklamakan Desert
	李向义 ; 张希明; 曾凡江; 李小明 ; 何兴元
来源期刊	植物学报
ISSN	1672-6650
出版年	2002
卷号	44 期号:10 页码:1219-1224
中文摘要	对塔克拉玛干沙漠-绿洲过渡带骆驼刺（Alhagi sparsifolia Shap.)水分关系的研究表明，骆驼剌在夏季保持了正的膨压，一直较高较稳定的清晨水势说明植物水分恢复状良好，植物得到了较好的水分供应；在7月，干旱胁迫造成的水分亏缺并未影响植株正常的蒸腾作用，因而干旱引起的水分胁迫并未威胁到植被的存在。骆驼刺对干旱胁迫的水分生理适应主要体现在叶水平上，表现为饱和枝条的渗透势（Ⅱo）和膨压消失点的渗透势（Ⅱp)的差值（△Ⅱ）和相对含水量（RWC）在膨压消失点间更大的变化、渗透调节的产生、较高较稳定的饱和枝条水分与干物质之比（WCsat）和膨压消失点的相对含水量（rwcp），以及较低的共质体水在总水分中的相对含量（RWCsym）。但形态学上的特征，主要表现为深而发达的根系和蒸腾面积的减少，才是骆驼刺适应极端干旱环境的主要途径。非定期的夏季一次性灌溉对地下水位很低地区的骆驼刺植被水分状况的恢复没有帮助。
英文摘要	Water relations of Alhagi sparsifolia Shap. at the transition zone between oases and sandy desert were studied in the southern fringe of Taklamakan Desert. Results showed that A. sparsifolia maintained the positive turgor during the summer. The steady high predawn water potential ((pp) indicated A. sparsifolia had sufficient hydration and water supply in growing season. In July, water deficit caused by drought stress had no effect on the transpiration of A. sparsifolia. Therefore, drought stress is not a main factor affecting the survival of plants. The physiological adaptation to drought of A. sparsifolia was shown mainly at the leaf level by sig-nificant difference (DeltaII) and relative water content (RWC) between the osmotic pressure at full turgor and at turgor loss, by occurring of osmotic adjustment, by high percentage of dry mass-related water content (WC_(sat)), by RWC at turgor loss point (RWC_p) in stable level and low RWC of the saturated symplast (RWC_(sym)). However, the morphological features of transpiring surface reduction and deep root system seem to be the main way for the plant to adapt to the extreme drought environment. Result also suggests that one time of irregular irrigation in summer will not be helpful to recover water status of A. sparsifolia in location where the water table is very low.
中文关键词	骆驼刺 ; 水分关系 ; 干旱胁迫 ; 水势 ; PV参数 ; 灌溉效果
英文关键词	alhagi sparsifolia water relation drought stress water potential PV parameters irrigation effect
语种	英语
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:1365121
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/203593
作者单位	1.Xingjiang Institute of Ecology and Geography, The Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China; 2.Deptartment Ecology and Ecosystem Research, Albrecht-von-Haller Institute of Plant Sciences, University of Gottingen, Gottingen
推荐引用方式 GB/T 7714	李向义,张希明,曾凡江,等. 塔干南缘骆驼刺植被水分关系的研究[J]. 中国科学院新疆生态与地理研究所,2002,44(10):1219-1224.
APA	李向义,张希明,曾凡江,李小明,&何兴元.(2002).塔干南缘骆驼刺植被水分关系的研究.植物学报,44(10),1219-1224.
MLA	李向义,et al."塔干南缘骆驼刺植被水分关系的研究".植物学报 44.10(2002):1219-1224.