玉米生长阶段降水分布影响分析

The influence of precipitation distribution in maize growth stage

利用多元回归方程插值方法进行玉米生长阶段历年平均降水量空间分布计算,通过绝对误差采用反距离权重法进行误差订正。根据玉米各阶段需水量、缺雨敏感度指标,计算各生长阶段受降水量影响程度。以各生长阶段需水量占全生育期需水量比例作为权重,计算内蒙古地区玉米全生育期受降水影响程度。结果认为:内蒙古地区降水量自东向西逐渐减少,普遍难以满足玉米生长需要。

By using multiple regression equation of the interpolation method, corn growth stage average precipitation spatial distribution was calculated in calendar year, the absolute error, inverse distance weighting method is used for error correction. On the basis of the water demand and the sensitivity index of lack rain in each stage of maize, the influence degree by precipitation was calculated in each growth stage. Using the proportion of water demand in each stage accounted for the whole growth period as the weight, It obtained the effects result of the precipitation in whole growth period. Inner Mongolia region precipitation generally difficult to meet the maize growth needs, and gradually reduce from east to west.