华北平原夏玉米农田生态系统蒸散规律研究

试验观测华北平原夏玉米全生育期农田蒸散日变化与季节变化特征结果表明 ,夏玉米农田蒸散量日变化规律明显 ,蒸散速率正午 13 :0 0达最大值 ,夏玉米日蒸散量随生育期的变化而变化 ,净辐射、土壤水分和叶面积指数影响夏玉米日蒸散量的变化。并建立了夏玉米农田水分运移的数学模拟方程

Research on evapotranspiration of field ecological system of summer maize in Northern Plain

Continuously measuring the evapotranspiration during t he whole summer maize growing period in the Northern Plain,daily and seasonly variations of field evapotranspiration and their influence factors are analyzed. The results show that the total evapotranspiration of summer maize pre sents an obvious daily variation and the rate of evapotranspiration of summer ma ize varies with the growing periods. The net radiation,soil water and leaf area index can all affect the variations of the total daily evapotranspiration. Final ly,the mathematic equation of summer maize to simulate the movement and transfer ring of soil water has been established.