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我省地形狭长,南北纵跨七个多纬度,境内乔山、秦岭、巴山横跨其间,光、温、雨量、栽培制度不同,水稻品种表现出很大的纬向差异和垂直差异,品种类型繁多。尤其秦岭南北阻隔,形成岭南岭北两个大的气候带。秦岭以南属亚热带湿润亚带,秦岭以北属半湿润暖温带及半干旱暖温带。按丁颖氏稻作区划,秦岭以南为以中秈稻为主的华中单双季稻作带,以北为以中粳稻为主的华北单季稻作带。在这两大稻作带内,地方品种的分布明显地反映了全省有几个不同的水稻生态区。见下表:
The topography of the province is long and narrow, with more than seven latitudes extending across the north and south. Within the boundaries of Qiaoshan, Qinling and Bashan, the varieties of light, temperature, rainfall and cultivation are different. The rice varieties show great latitudinal and vertical differences. Many. In particular, Qinling north-south barrier, the formation of Lingnan Lingbei two large climate zone. To the south of the Qinling subtropical humid subzone, north of the Qinling sub-humid warm temperate and semi-arid warm temperate zone. According to the Dingying rice planting zoning, the south of Qinling is the middle and mid-season single-and double-cropping rice belt dominated by middle-indica rice, and the north is the single-cropping rice belt of North China dominated by middle japonica rice. Within the two rice belt, the distribution of local varieties clearly reflects the province has several different rice ecological zones. See the table below: