风沙区参考作物需水量的计算

根据国内外相关的研究成果 ,分析选择并确定了适宜于风沙区参考作物需水量 (ET0 )的计算模式。利用典型风沙区的气象资料 ,对多年逐旬参考作物需水量及 2 0 0 1年春小麦与春玉米生育时段内逐日参考作物需水量进行了分析计算。结果表明 ,FAO最新修正的 Penman-Moteith公式可较好地用于风沙区参考作物需水量的估算 ,一般 ET0 值在年内与年际间变化较大 ,最高值发生在 6月上旬左右 ,多年平均为 5 .82 mm/ d,最低值发生在 1月上旬 ,多年平均 0 .43 mm/ d左右 ,年内各日 ET0 值受气象因素的影响变幅很大 ,因此 ,精确灌溉应设法提高短期天气预报和灌溉预报的精度

Reference Crop Evapotranspiration Calculation in Windy Desert Area in Inner Mongolia

Several models of calculating reference crop evapotranspiration ( ET 0 ) are selected and compared in calculating reference crop evapotranspiration for windy desert area in Inner Mongolia. The data collected from a weather station in the typical windy desert area was used to calculate the reference crop evapotranspiration for each ten days period, and the daily reference crop evapotranspiration in spring wheat season and spring corn season in 2001. Results show that the latest revised Penman Monteith equation recommended by FAO in 1998 is more suitable for estimating reference crop evapotranspiration in the windy desert area in the Inner Mongolia. Generally, ET 0 values vary obviously with time, and the variation of ET 0 of the same period also is remarkable. At average, the greatest ET 0 value is 5.82 mm/d and appears in the first ten days of June. The least ET 0 values is 0.43 mm/d and occurs in the first ten days of January. The daily ET 0 values are affected and determined mainly by weather factors, which indicates the necessary of a precision weather forecast for a precision irrigation management.