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自然概况 本市濒临黄河南岸,地处黄淮平原,位于东经113°39′、北纬34°43′,年平均气温14℃左右,月平均气温16℃以上有6个月(5～10月),年降雨量600～700mm。郊区农作物历来以旱田为主,五十年代开始利用城市污水灌溉藕田,六十年代又发展引黄灌溉稻田,1970年稻田面积达6万多亩,1983年扩展到50万亩。这些自然条件是构成疟疾传播的重要因素。
Natural Overview The city is on the south bank of the Yellow River, located in the Huanghuai Plain, east longitude 113 ° 39 ’, latitude 34 ° 43’, the annual average temperature of about 14 ℃, the monthly average temperature of 16 ℃ for 6 months (May to October) , The annual rainfall of 600 ~ 700mm. Suburban crops have always been dominated by upland fields. In the 1950s, lotus fields began to be irrigated by urban sewage. In the 1960s, irrigated and irrigated rice fields were also developed. In 1970, paddy fields had an area of over 60,000 mu and their area was expanded to 500,000 mu in 1983. These natural conditions constitute an important factor in the spread of malaria.