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农田蒸散是形成土壤干旱的主要因素。本文采用陶祖文的彭曼修正公式对冀东地区的唐山、秦皇岛、乐亭、遵化等地3～11月的可能蒸散与可能实际蒸散进行了计算,并与本省南部的曲周做了可能蒸散量的对比分析。在统计分析的基础上,按《干旱分析方法的探讨》一文给出的华北地区干旱指标,用唐山农业气象站1980～1989年观测旱作地段的土壤湿度资料,对当地干旱的发生与干旱的指标进行了分析和验证。
Farmland evapotranspiration is the main factor of soil drought. In this paper, the probable evapotranspiration and potential evapotranspiration from March to November in Tangshan, Qinhuangdao, Laoting, Zunhua and other places in eastern Hebei Province are calculated by using the Pengman correction formula of Taozu Wen. Comparative analysis of the amount. On the basis of statistical analysis, according to the drought index of North China given in the article “Discussion on Drought Analysis Method”, using the data of soil moisture in the dry land of Tangshan Agricultural Observatory from 1980 to 1989, the author analyzed the occurrence and drought of the local drought Indicators were analyzed and verified.