【摘要】 研究了秸秆覆盖对冬小麦生育后期不同天气状况下的茎流速率特征、耗水量及产量等的影响。结果表明,秸秆覆盖与不覆盖处理时,冬小麦茎流速率在阴天条件下均呈不规则曲线变化,峰值分别为2.6 g/h和1.8 g/h;阴转晴天气条件下,前期冬小麦茎流速率呈不规则曲线变化,后期呈升高-降低趋势并出现小高峰,峰值分别达到4.0 g/h和2.7 g/h;晴天条件下,冬小麦茎流速率曲线呈类似抛物线形状,峰值分别达到4.2 g/h和2.1 g/h。同时,不覆盖处理峰值出现时间比覆盖处理均有不同程度推迟。和不覆盖处理相比,秸秆覆盖处理的耗水量和产量分别降低了6.2%和5.0%,而水分利用效率则无显著差异。更多还原

【Abstract】 With winter wheat as the experimental material,the effects of straw mulching on sap flow,evapotranspiration,grain yield and water use efficiency in late growing stage were studied.The results indicated that in the mulching treatment and non-mulching treatment,the sap flow rates both changed with irregular curves and the peak values were 2.6 g/h and 1.8 g/h in cloudy conditions;The sap flow rates changed with irregular curves at first,then they changed with the increasing-decreasing trends,and the peak values were 4.0 g/h and 2.7 g/h in cloudy to sunny conditions respectively;The sap flow rates both changed with similar parabolic curves and the peak values were 4.2 g/h and 2.1 g/h in sunny conditions.The occurring time of peak in non-mulching treatment was much later than that in mulching treatment.Compared with non-mulching treatment,the evapotranspiration and grain yield in mulching treatment decreased by 6.2% and 5.0%;however,water use efficiency was not significant between the treatments.更多还原