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本文介绍了根据桑斯威特和马瑟方法确定中国北方干湿期分布的过程,并提供了不同干旱类型地区38个地点生长季各月30年平均的农田中作物需要水分的短缺和多余量。对800多个站点的气象和土壤资料的计算表明,中国北方干湿期的分布主要有五个类型:全干型、一干一湿型或一湿一干型、二干一湿型、二湿一干型、二干二湿或二湿二干型。它们形成了干旱地区的持续干旱、干长湿短和季节性干旱几种不同类型,并分别对旱地农业产生不同的影响。本文还为干旱地区节水灌溉提供了限额指标。
This paper presents the process of determining wet and dry distribution in northern China based on the methods of Sanswer and Mather, and provides a 30-year average farmland crop water deficit and surplus for each of the 38 growing season locations in different drought types . Calculations of the meteorological and soil data from more than 800 sites show that there are mainly five types of distribution in the wet and dry season in northern China: total dry, dry or wet, dry and wet, dry and wet Type, two dry two wet or two wet two dry type. They form several different types of dry, dry, short dry and seasonal drought in arid regions, and have different impacts on dryland agriculture, respectively. This article also provides a quota for water-saving irrigation in arid areas.