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里下河地区是我省粮食重要产地之一.近年来,随着农业学大寨运动的深入开展,大搞以治水增肥改土为中心的农田基本建设,不断改革耕作制度,双季稻的种植面积逐年扩大.但如何充分利用农业气候资源,进行合理的品种布局,保证双季稻高产稳产,是当前尚待解决的问题.为此,我们对该地区种植双季稻的气候条件进行了初步分析.一、双季稻生长期间的热量条件里下河地区位于江淮之间,地势平坦低洼,成碟形.东面邻近海洋,气候温和湿润,境内水面面积大.大气受水体影响,气温比同纬度内陆地区高,特别是碟形中心的兴化,年平均气温比碟缘各县高0.5—1.0℃.由于该区东北部沿射阳河和海口一线,较低洼,缺少屏障,寒流易于侵入,加之碟形地利于冷空气的堆积,给春温的回升,秋温的下降都带来一定的影响.
Lixiahe area is one of the important grain producing areas in our province.In recent years, with the deepening of the agricultural science Dazhai movement, vigorously promote the basic construction of farmland by water improvement and soil improvement, continuous reform of farming system, double cropping rice Of the planting area has been expanding year by year.But how to make full use of agricultural climate resources, make reasonable variety layout and ensure high and stable yield of double cropping rice are the problems to be solved.Therefore, we conducted climatic conditions for planting double cropping rice in this area First, the heat conditions during the growth of double cropping rice In the river area is located between the Jianghuai, flat and low-lying, into a dish .Eastern adjacent to the ocean, the climate is mild and humid, the territory of the surface area of the water.Small atmosphere by the impact of water, The air temperature is higher than that of the inland area at the same latitude, especially in the center of the dish, and the average annual temperature is 0.5-1.0 ℃ higher than that of the counties in the plate margin. Since the northeastern part of the area is along the Sheyang River and Haikou line, Cold easy to invade, combined with the disc shape conducive to the accumulation of cold air to the spring temperature rise, the fall in temperature have brought a certain impact.