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作 者 ：冯燕,王彦荣,胡小文

期 刊 ：草业学报 2011年 20卷 4期 页码：293-298

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；

Keywords:water stress, Zygophyllum xanthoxylum, Caragana korshinskii, water use efficiency, δ13C,

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(WUE_L)和叶片碳同位素组成(δ¹³C 值),并对各生长指标、δ¹³C 值与WUE_L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WUE_L与叶片δ¹³C值逐渐提高,且WUE_L与δ¹³C 值呈显著正相关(P<0.05);3)霸王和柠条的WUE_L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WUE_L较低,但δ¹³C值相对较高。

Abstract: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 (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.

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