摘要
辽宁省西北部地区多年降雨量与蒸发量频率分析结果表明,春季抗旱保苗是这一地区发展旱地农业的技术关键。该区湿润系数的经验频率以夏季最高,秋季为85.71%。由于这一地区水资源短缺,发展灌溉困难,这不仅使春季保墒成为必需。也使跨季节调控土壤墒情成为可能。采取的夏深松—蓄集雨水,秋整地—施肥与覆膜保墒,翌年春季适时播种措施,改革栽培与耕作方式,春季保苗效果十分明显,减少了土壤水分的无效蒸发,有效地利用雨水资源,为该区作物高产和农业高效奠定了基础。
The analyses of rainfall and evaporation of years in Northwest Liaoning Province showed that the significant difference between rainfall and evaporation is one of the important reasons for drought taking place in spring. The drought degree can be scaled by means of humidity coefficient（0.33）. Based on the coefficient, the empiric frequency of ≥0.33 is calculated for every season in 20 years. The result showed that the distributing frequency of ≥0.33 is highest in summer and 85.71 % in autumn. Such a state can provide a good chance for taking the cover measure to control soil moisture in successive seasons. The control measures of deeply loosening soil in summer and plastic film used in autumn can improve rainfall infiltration into soil and provide sufficient moisture for seeding in next spring.
出处
《水土保持通报》
CSCD
北大核心
2007年第6期203-206,共4页
Bulletin of Soil and Water Conservation
基金
国家"863"计划重大节水专项(2002AA2Z4321)
关键词
辽西北
湿润系数
墒情调控
Northwest Liaoning Province
humidity coefficient
soil moisture control measures
