控制排水条件下冬小麦水位生产函数的试验研究

Experimental study of water-level production function for winter wheat under controlled drainage conditions

为了研究冬小麦地下水埋深与产量的关系,以地下水的降落速度与适宜埋深作为冬小麦排水的调控指标,在蒸渗测坑内进行冬小麦水位调控试验,通过理论分析和数值计算,建立了排水条件下冬小麦水位生产函数;考虑到根层土壤含水量与地下水位的耦合作用对冬小麦产量的影响,提出了用土壤含水量作为修正系数的控制排水条件下冬小麦的水位生产函数.函数求解结果表明:在涝渍条件下,冬小麦各生育阶段受涝渍影响程度由大到小顺序为:拔节孕穗期、抽穗开花期、乳熟期、分蘖期;受旱情况下,冬小麦各生育阶段受旱敏感指数由大到小顺序为:抽穗开花期、拔节孕穗期、分蘖期、乳熟期.

In order to investigate the relationship between the groundwater depth and yield of winter wheat,a water level control test on the winter wheat was carried out in evaporation-infiltration test pits,based on control indices including the descending velocity and the suitable depth of the groundwater.Through theoretical analysis and numerical calculation,the water-level production function for the winter wheat under drainage conditions was developed.With consideration of the coupling effect of the root-soil water content and the groundwater level on the yield of the winter wheat,the water-level production function for the winter wheat under controlled drainage conditions was established,with the soil water content considered to be the correction coefficient.The results show that under the waterlogging conditions,the growth periods of the winter wheat diminish in the following order： the jointing and booting stage,the sprouting and blooming stage,the milky ripe stage,and the tillering stage;and under the drought conditions,the growth periods of the winter wheat diminish in the following order： the sprouting and blooming stage,the jointing and booting stage,the tillering stage,and the milky ripe stage.