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冷害是大理县水稻生产发展的严重威胁。一九五九年以来,由于低温频繁,其危害机率有所增加,冷害研究便显得十分迫切。 (一)情况大理县农田分布在海拔两千公尺左右,较为平坦,年平均气温15.0℃,最热月七月平均气温20.1℃,年降雨量1077.7毫米,雨季一般开始于六月八日前。水稻生育期的3—9月,日照为1252.8小时,太阳幅射量为88399卡/cm~2,总积温为3700—3800℃左右。由于低纬高原的特点,气候温和,日照充足,光质好,昼夜温差大,雨、热同季,光、热、水配合较好,为水稻生产提供了一
Cold damage is a serious threat to the development of rice production in Dali County. Since 1959, due to the frequent occurrence of low temperatures, the probability of its harm has increased, and research on chilling injury has become extremely urgent. (I) Situation Dali County’s farmland is located at an altitude of about two thousand meters above sea level, with a relatively flat average annual temperature of 15.0 ℃. The hottest month has an average temperature of 20.1 ℃ in July and an annual rainfall of 1077.7 millimeters. The rainy season generally begins before June 8. Rice growth period from March to September, sunshine 1252.8 hours, the amount of solar radiation 88399 cards / cm ~ 2, the total accumulated temperature 3700-3800 ℃ or so. Due to the characteristics of low latitude plateau, mild climate, adequate sunshine, good light quality, large temperature difference between day and night, rain, heat with the season, light, heat, water with better, providing a rice production