【摘要】 <正> 我国地域辽阔,地形复杂,气候类型多样。为使农业获得稳产、高产,则须从实际出发进行耕作制度改革,因地制宜地提高复种指数。而这不仅要考虑社会经济条件和科学水平,还要充分合理地利用自然资源。因此我们对光、热、水资源的分布特点,以及农作物对热量条件的要求,结合熟制改革,从农业气候的角度出发,把我国从北到南分成几个不同熟制的区域,为考虑作物合理布局,以及实现农业区域化、专业化,提供农业气候依据。更多还原

【Abstract】 The time and space distributions and their rules of light, heat and water resources in our country and the agroelimatic conditions required for staple crops are analysed in detail, and obtained accumulated temperature indexes of the different varieties of staple crops. Because of the heat condition is a major climatic factor for the development and yield of the crops, and the numbers of multiple crop index in a region also depend on how much the heat is, we consider≥0℃ accumulated temperature as principle index, and the disaster weather as supplementary index, the numbers of continuous cropping as multiple crop index, According to the indexes mentioned above, our country can be divided into three regions (one crop a year, two crops a year and three crops a year) and thirteen subregions. The favourable and unfavourable conditions in every region are described. There were many disputes on the problems of double cropping of rice and an additional cropping of wheat in Southern Jiangsu and double cropping of rice in Siehuan, for this reason we give some veiws on this question.更多还原