Water Relations on Alhagi sparsifolia in the Southern Fringe of Taklamakan Desert

作     者：李向义 张希明 曾凡江 Andrea FOETZKI Frank M .THOMAS 李小明 Michael RUNGE 何兴元 

作者机构：中国科学院新疆生态与地理研究所乌鲁木齐830011 德国哥廷根大学生态与生态系统研究所哥廷根d37073 中国科学院沈阳应用生态研究所沈阳110016 

出 版 物：《Acta Botanica Sinica》 (Acta Botanica Sinica（植物学报：英文版）)

年 卷 期：2002年第44卷第10期

页      面：1219-1224页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：中国-欧盟合作项目 (ERBIC18CT980275 ) 国家重点基础研究发展规划项目 (G19990435050 4) 中国科学院重大项目(KZ951-B1-231-0 2-0 2 ) 新疆"山川秀美"计划 (980 10 80 0 1-0 4-0 1) 中国科学院创新领域前沿项目 (KZCX-XJLQ-0 5 )。~~ 

主　　题：Alhagi sparsifolia water relation drought stress water potential PV parameters irrigation effect 

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 (psi(P)) 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 significant 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 ( WCsat), by RWC at turgor loss point ( RWCp) in stable level and low RWC of the saturated symplast (RWCsym). 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.