摘要
采用排水式蒸渗仪试验，研究了不同地下水埋深时，冬小麦需水量和地下水利用量的变化规律。结果表明，冬小麦生育期内地下水控制在1．0～1．5m以下，对减少冬小麦需水量最为有益；随着地下水埋深增加，地下水利用量和地下水利用系数显著减小；不同地下水埋深条件下冬小麦生育阶段日需水量变化规律表现基本一致，即越冬前较大，在越冬期最小，抽穗灌浆期达到最大，然后又减少。研究结果可为冬小麦节水灌溉制度的制定和高效灌溉管理提供参考。
Water requirement of winter wheat and groundwater contribution are investigated under different groundwater depth by u- sing drainable lysimeter. The results show that it is the most useful to reduce the water requirement of winter wheat when the groundwater depth is controlled at 1.0-1.5 m below in the growth period of winter wheat. The groundwater contribution and utili- zation coefficient decreases significantly with the increase of groundwater depth. The dynamic changes of daily evapotranspiration of winter wheat under different groundwater depth show consistent, namely the value is high before wintering, reaches the minimum during wintering and the maximum at heading and grain-filling period, then decreases. The result obtained from the paper can pro- vide reference for water-saving irrigation scheme design and effective irrigation management of winter wheat.
出处
《节水灌溉》
北大核心
2010年第8期1-3,共3页
Water Saving Irrigation
基金
国家科技基础性工作专项"中国农业气候资源数字化图集编制"(2007FY120100)
关键词
地下水埋深
需水量
地下水利用量
冬小麦
groundwater depth
evapotranspiration
groundwater contribution
winter wheat
