中文摘要：

建立了小麦茎秆在风荷载和麦穗自重作用下受力的数学模型,通过研究小麦在风荷载作用下的受迫振动,分析了小麦茎秆的抗倒伏能力.通过比较小麦茎秆的自重和风载产生的倒伏力矩与土壤重力及摩擦力的抗倒伏力矩,推导出倒伏与小麦茎秆性状特征之间的关系式,进一步给出茎秆所能承受的临界风速.该模型可以对小麦茎秆的抗倒伏能力进行评估预测,同时也为育种专家培育高产优质抗倒伏小麦品种株型提供了理论参考.

英文摘要：

The mathematic model of wheat stem in the condition of the wind load and the wheat grain weight was established in this paper.According to study on forced oscillation of wheat under the wind overload,the ability of lodging resistance of the wheat stem was analysed.Based on the comparison of the lodging torque and lodging resistance torque of wheat stem,the relationship between stem characteristics and lodging was shown.Moreover,critical force velocity of the wheat stem was also given.The research conclusion is useful to evaluate the ability of lodging resistance of the wheat stem and provide a theoretical basis for expert to breed high yield and good quality cultivation lodging wheat plant.