草业学报2011，Vol.20Issue(4)：293-298,6.
水分胁迫对两种荒漠灌木幼苗生长与水分利用效率的影响
Effects of soil water stress on seedling growth and water use efficiency of two desert shrubs
摘要
Abstract
Seedling growth, water use efficiency and leaf carbon isotope composition (δ13C value) of Zygophyl-lum xanthoxylum and Caragana korshinskii were measured at different soil water stress levels in a pot experiment. The correlation between growth and water use efficiency was analyzed. 1) Severe water stress seriously decreased the total biomass, above ground biomass, total leaf area and leaf number of Z. Xanthoxylum and C. Korshinskii; 2) As water stress increased, water use efficiency and the δ13C value increased. Water use efficiency and the δ13C value had a significant (P<0. 05) positive relationship; 3) Water use efficiency had a significant negative relationship with total leaf area, leaf number(P<0. 01) , and total biomass(P<0. 05) ;4) The biomass and total leaf area of C. Korshinskii were significantly smaller than those of Z. Xanthoxylum, but the root/shoot ratio was bigger. C. Korshinskii is sensitive to water stress and its biomass, leaf area and leaf number are considerably reduced by this stress;5) Under the same water stress gradient, water use efficiency of C. Korshinskii is lower but the δ13C value is higher than those of Z. Xanthoxylum.关键词
水分胁迫/霸王/柠条/水分利用效率/叶片碳同位素组成Key words
water stress/ Zygophyllum xanthoxylum / Caragana korshinskii / water use efficiency/ δ13C分类
农业科技引用本文复制引用
冯燕,王彦荣,胡小文..水分胁迫对两种荒漠灌木幼苗生长与水分利用效率的影响[J].草业学报,2011,20(4):293-298,6.基金项目
国家基础研究发展计划[973项目(2007CB108904)],国家科技支撑项目(2011BAD17B02)和兰州大学中央高校基本科研业务费专项资金(layjbky-2009-05)资助. （2007CB108904）
