小麦茎秆弯折力学性能的试验研究

Studies on Bending Mechanical Propertiesof Wheat Stalk

以高秆、中秆和矮秆3个品种的小麦为试验对象, 进行了不同生长期、不同节间惯性矩、弹性模量、抗弯刚度等力学指标的测定和相应变化规律的研究, 旨在探索指导小麦优种筛选相应的生物力学性能指标和评判方法。试验结果表明: 在乳熟期内, 节间位置对三品种的茎秆惯性矩、弹性模量、抗弯刚度等三个指标均影响极显著; 生长期对三品种茎秆基部第二节段的弹性模量、抗弯刚度两个指标影响也极显著, 而生长期对茎秆基部第二节段惯性矩的显著性影响因品种的不同而有所差异。

Young's modulus,bending rigidity and the moment of inertia were measured and relevantchanging trends were studied for different wheat varieties( high stalk, medium stalk and short stalk) in different growthperiods and differentinternodes,relevantbiomechanics indexes andevaluating methods in a sieving forwheat were obtained. The results showed that the moment of inertia,bending rigidityand Young's modulus of the stem for three varieties were all significantly affected by internodeposition in Milky stage. Young's modulus andbending rigidityof the second internodeof different wheat varieties were all significantly affected by growthperiods, but the effects of growthperiods to the moment of inertia of the second internodehad the differencebecause of different varieties.