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    徐飞, 郭卫华, 徐伟红, 王仁卿. 刺槐幼苗形态、生物量分配和光合特性对水分胁迫的响应[J]. 北京林业大学学报, 2010, 32(1): 24-30.
    引用本文: 徐飞, 郭卫华, 徐伟红, 王仁卿. 刺槐幼苗形态、生物量分配和光合特性对水分胁迫的响应[J]. 北京林业大学学报, 2010, 32(1): 24-30.
    XU Fei, GUO Wei-hua, XU Wei-hong, WANG Ren-qing. Effects of water stress on morphology, biomass allocation and photosynthesis in Robinia pseudoacacia seedlings[J]. Journal of Beijing Forestry University, 2010, 32(1): 24-30.
    Citation: XU Fei, GUO Wei-hua, XU Wei-hong, WANG Ren-qing. Effects of water stress on morphology, biomass allocation and photosynthesis in Robinia pseudoacacia seedlings[J]. Journal of Beijing Forestry University, 2010, 32(1): 24-30.

    刺槐幼苗形态、生物量分配和光合特性对水分胁迫的响应

    Effects of water stress on morphology, biomass allocation and photosynthesis in Robinia pseudoacacia seedlings

    • 摘要: 采用人工控水设置4个水分梯度,研究1年生刺槐幼苗形态结构、光合特性、生物量积累及其分配对水分胁迫的可塑性响应。结果表明:随干旱胁迫程度的增强,形态指标均逐渐降低;结合异速生长曲线的分析,说明植物能根据干旱胁迫的强度和持续时间采取不同的适应策略。叶片水分饱和亏缺逐渐增加的同时,净光合速率和蒸腾速率逐渐减少,光合限制因素由气孔限制为主逐渐转变为非气孔限制为主。光能利用效率降低,同时光系统的保护机制减弱,造成光抑制程度的加剧。土壤干旱降低了各器官的生物量积累,光合产物向地下部分尤其是侧根迁移,使根生物量比增加;而这种分配方式是以降低叶生物量比为代价的,因此造成根冠比的增大、叶面积比率和比叶面积的减少。可塑性指数分析表明:刺槐幼苗主要通过调节形态和光合能力来适应水分环境的变化,生物量积累和分配的差异可能存在异速生长的影响。

       

      Abstract: A water gradient experiment with four different water supply levels was conducted by artificial water control in the rainout shelters to study the plasticity of morphological architecture, photosynthetic characters, biomass accumulation and allocation in oneyearold Robinia pseudoacacia L. seedlings in response to diverse water stress. The results showed that morphological variables decreased with an increase in water stress. Seedlings could introduce different strategies based on the intensity and duration of drought stress, which can be proved by the analysis of allometric trajectory. Consistent with the increasing leaf water saturation deficit in water stress, net photosynthetic rate and transpiration rate also decreased. Factors that limited photosynthesis shifted from stomatal limitations to nonstomatal limitations. Reduced light use efficiency, as well as weak photoprotective effect in photosystem, caused more serious photoinhibition. Biomass accumulations in each organ were restricted by the deficit of soil water content. More photosynthetic products were transferred to belowground parts, especially to lateral roots. Carbon allocation patterns were altered by an increase in root mass ratio at the expense of decreased leaf mass ratio, and it therefore led to higher root to shoot ratio, lower leaf area ratio and lower specific leaf area. Plasticity index analysis indicates  that the seedlings of R.  pseudoacacia could adapt to diverse water stress through plastic responses in morphology and photosynthesis, whereas the differences of biomass accumulation and allocation might be partly affected by the allometry. 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