西藏主要农区青稞作物系数的计算分析

The Computation and Analysis of Highland Barley Crop Coefficient in the Main Agricultural Area of Tibet

以西藏拉萨试验站实测资料验证FAO推荐的作物系数修正方法的适应性，然后计算西藏主要农业区青稞作物系数。结果表明，作物系数的计算值与实测值较接近。西藏主要农区（林芝、索县、日喀则、普兰）初始生长期青稞作物系数在0．12～0．33之间，生育中期作物系数在1．18～1．33之间，成熟期作物系数在0．61～0．78之间。青藏高原青稞作物系数总体上变化不大。

The measured data in Lhasa experimental station of Tibet was used to verfy the application of single coefficient method recommended by FAO in local area, and the crop coefficients in the main agricultural areas of Tibet were calculated by the amended single crop coefficient method. The results indicated that the calculated crop coefficients were close to the measured data and the the modified method was feasible. The crop coefficients in the main agricultural areas of Tibet were o. 12-0. 33 in the initial period of growth, 1. 18-1. 33 in the middle stage of growth, and 0. 61-0. 78 in the mature period. The crop coefficients of highland barley in Qinghai-Tibet Plateau changed little in the whole.