西藏自治区地势高亢、气候温凉,是一个以农牧业为主的地区。种植业主要分布在雅鲁藏布江中游及其支流拉萨河、年楚河、尼洋河,以及藏东横断山脉诸河流的河谷和低山地。以海拔3000—41OOm之间最为集中。主要粮食作物有春青稞和冬、春小麦。农区春季回暖早、增温慢,夏季温凉、太阳辐射强,光照时间长,因此作物全生育期一般较长,麦类幼穗分化充分、灌浆饱满、穗大粒重,单位产量高。冬、春小麦和春青稞曾分别创亩产836.5kg、832kg和579.9kg的高产记录。但目前大田产量多在100—200kg,潜力远未得到发挥。究其原因,除耕作管理 Tibet Autonomous Region has a high-lying terrain and a cool climate. It is an area dominated by agriculture and animal husbandry. The planting industry is mainly distributed in the middle reaches of the Brahmaputra and its tributaries Lhasa River, the Nianchu River, the Niyang River, and the rivers and valleys of the Hengduan Mountains in the eastern Tibet. The most concentrated between 3000-41OOm. The main food crops are spring 稞 and winter, spring wheat. Early spring rebound in rural areas, slow warming, summer cool, strong solar radiation, light a long time, so the whole crop growth period is generally longer, wheat spike differentiation, full filling, spike large grain weight, high yield. Winter, spring wheat and spring pheasant had a yield of 836.5kg per mu, 832kg and 579.9kg of high-yield records. However, at present, the output of fields is more than 100-200kg and the potential is far from being realized. The reason, in addition to farming management