利用气象卫星数据对宁夏川区春小麦估产的研究

Estimation of Yield of Spring Wheat in Irrigation Area of Ningxia Using Data from Meteorological Satellite

利用气象卫星AVHRR第一、二通道的反照率,计算出比植被指数,设定虚拟单产为中间变量进行回归分析。首先建立春小麦虚拟单产预报模式,再利用区域国土总面积换算出总产。由于春小麦种植面积与比植被指数间存在明显的相关关系,拔节一孕穗期的比植被指数通过中间变量麦土比可测定春小麦的实际种植面积,进而求算出春小麦的单产和总产。

The specific vegetation index is calculated using albedo of Channel 1 and 2 of meteorological satellite AVHRR and a regression analysis made with virtual yield as interme-diate variable. First, forcasting pattern of virtual yield of spring wheat is established and then the total output is computed using the regional total land area. Because there is a obvious correlation between the spring wheat Planting area and the specific vegetation index, the actual planting area of spring wheat can be determined by the specific vegetation index during the stem pushing—boot stage with the wheat—land ratio as a intermediate variable and then the yield and total output of spring wheat can be calculated.