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

作　　者：冯燕[1] 王彦荣[1] 胡小文[1] 

机构地区：[1]兰州大学草地农业科技学院草地农业系统国家重点实验室(筹),甘肃兰州730020

出　　处：《草业学报》2011年第4期293-298,共6页Acta Prataculturae Sinica

基　　金：国家基础研究发展计划[973项目(2007CB108904)];国家科技支撑项目(2011BAD17B02);兰州大学中央高校基本科研业务费专项资金(layjbky-2009-05)资助

摘　　要：通过盆栽试验测定了不同水分胁迫下霸王和柠条幼苗的生长生理特性,长期水分利用效率(WUEL)和叶片碳同位素组成(δ13C值),并对各生长指标、δ13C值与WUEL进行了相关性分析。结果表明,1)重度水分胁迫显著降低霸王和柠条的总生物量、地上生物量、总叶面积、叶数;2)随水分胁迫程度增加,霸王和柠条的WUEL与叶片δ13C值逐渐提高,且WUEL与δ13C值呈显著正相关(P<0.05);3)霸王和柠条的WUEL与总叶面积、总叶数呈极显著负相关(P<0.01),与总生物量呈显著负相关(P<0.05);4)柠条的生物量和总叶面积显著小于霸王,但其根冠比较高,且在水分胁迫时,生物量、叶面积、叶数大幅度降低,对水分胁迫反应更敏感;5)同一水分梯度,柠条的WUEL较低,但δ13C值相对较高。Seedling growth,water use efficiency and leaf carbon isotope composition（δ13C value） of Zygophyllum 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（P0.05） positive relationship;3） Water use efficiency had a significant negative relationship with total leaf area,leaf number（P0.01）,and total biomass（P0.05）;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 

分 类 号：S793[农业科学—林木遗传育种]