荻实生苗生物构件对土壤水分胁迫的响应

以荻（Miscanthus sacchariflorus）实生苗为研究对象，对其生物学构件在轻度、中度和重度水分胁迫下的响应进行了研究。结果表明，随着土壤含水量的下降，荻的株高、茎粗、茎节间长度、叶面积、比叶重、地下茎茎粗、地下茎分布深度、地下茎节间长度、地上及地下部分生物量和冠根比均随之下降；荻可以适应轻度的水分胁迫，在轻度水分胁迫下，除了冠根比、茎粗、叶面积和比叶重等构件外，其余生物构件与对照无显著差异（P>0.05）；而在中度和重度水分胁迫下，荻生物构件均受到严重抑制，与对照差异显著（P＜0.05）。

Study on the adaptability of Misconstrues sacchariflorus biological components to soil water stress

Effects of soil water stress on biological components of Misconstrues sacchariflorus were studied by using pot cultured seedlings as experimental materials, exposing them to light, moderate stress and heavy water stress. Results showed that the plant height, stem diameter, stem internode length, leaf area, specific leaf weight, rhizome stem diameter, rhizome distribution depth, rhizome internode length, ground and underground part biomass, and crown root ratio declined with stress increased. M.sacchariflorus can adapt to light water stress. Under light water stress, except crown root ratio, stem diameter, leaf area, specific leaf weight and member, the rest biological components(normal water supply) had no significant difference（P＞0.05), with control. Under moderate and heavy water stress, biological components were serious restrained and had significant difference （P＜0.05） with control.