中文摘要：

为了解滴灌冬小麦根系生长及水分利用对滴灌量的响应,以新冬18号为材料,利用双管分根法比较分析了拔节期后4.24、6.12、8.01和9.89kg·管-14种水分处理（每个处理灌水4次）下滴灌小麦根干重和根长的分布、0~100cm土层含水量及产量和水分利用效率的差异。结果表明,加大滴灌量使0~100cm土层湿润深度增加,尤其是提高了0~40cm土层的含水量下限,并增加该土层的小麦初、次生根干重及根干重密度、根长及根长密度,延缓花后初、次生根干重密度的衰减。增加滴灌量显著提高小麦产量和水分利用效率。说明增加滴灌量可促进滴灌冬小麦拔节期至孕穗期根系生长,并延缓生育后期根系的衰亡,有利于产量和水分利用效率的提高。

英文摘要：

The aim of this research was to reveal the effects of drip irrigation amount on temporal spatial distribution of root and water use efficiency of winter wheat.Xindong 18 was used as research material.The influence of four drip irrigation treatments on temporal spatial distribution of root and water use efficiency of Xindong 18 was investigated.The four irrigation treatments were 4.24kg·tube-1,6.10kg·tube-1,8.00kg·tube-1,9.89kg·tube-1 drip irrigation at post-jointing stage.The irrigation times were four in each treatment.The study aimed to simulate the effects of drip irrigation on soil water content,distribution of root dry weight of primary root and lateral root,and the distribution of root length,water use efficiency and yield at 0-100 cm soil layer.The results indicated that as the amount of water dripping increased,the depth of wet soil layers increased,the lower limit of soil moisture at 0-40 cm soil layer improved especially;the dry weight of primary root and lateral root and the root weight density increased;the root length of primary root and lateral root and the density of root length incresed;and decayed dry weight density of primary root and lateral root has been delayed.The increase of drip irrigation amount significantly improved yield and water use efficiency.It was indicated that the increase of drip irrigation amonut promoted root development from jointing stage to booting stage,and delayed the decay of primary root and lateral root during fillingstage,which is an important reason for increasing of yield and water use efficiency.