摘要
针对华北高寒区蔬菜雨养旱作生产,通过定位观测试验,研究了不同潜水位水平及其地膜覆盖的萝卜田耗水量与耗水组成,菜田耗水的时空特征及覆膜的水分产量效应。结果表明,3m以下潜水对菜田耗水极少贡献;2m与1m潜水位菜田潜蒸水可有25.79mm与71.78mm,对萝卜旱作生产具重要作用。萝卜田生育期平均耗水强度2.94~3.41mm·d-1,30~60cm土层是主要供水层次。覆膜萝卜田,较裸地水分蒸失减少15.51~39.19mm,水分利用效率提高40.00%~81.70%。地膜在萝卜生育期间“前保后供”的土体水分调节效应,成为旱区农作水分时序高效利用的重要机制。
For the success of rainfed cropping in the cold and semiarid region of North China, the characteristics of water consumption on quantity and variation in soil of different depths and the effects of plastic film-mulched radish field were studied. The results showed that little water consumption of radish field came from ground water table at 3 m depth; 25,79 man and 71.78 mm came from 2 m and 1 m depths respectively, Water consuming ratio was 2.94-3.41 mm.dt in radish growing period, and 30-60 cm depth was the main horizon on water supply. Plastic film-mulched radish field decreased water evaporation by 15.51%-39.19% and increased water use efficiency by 40,00 %-81.70% compared with the control. Film mulching plays an important role in water use efficiency in the rainfed farming by the mechanism of storing water in early radish growing stage and supplying it in the late stage.
出处
《中国农业科学》
CAS
CSCD
北大核心
2005年第12期2481-2485,共5页
Scientia Agricultura Sinica
基金
国家重点基础研究项目(G2000018606)
国家防沙治沙应急计划项目(FS2000-03)
关键词
耗水量
潜水蒸发
地膜覆盖
萝卜
华北高寒区
Water consumption
Evaporation of underground water
Film mulching
Radish
Cold region of North China