风沙区春玉米棵间蒸发变化规律的研究

Research on Variation Rule of Evaporation of Spring Corn in Windy and Dusty Areas

棵间土壤蒸发是农田水平衡计算的重要参数 ,利用微型蒸渗仪测定了春玉米生长期间棵间蒸发的逐日变化过程 ,确定了春玉米生长期间棵间蒸发占总蒸散量的比例关系 ,并对相对土面蒸发强度E/ET0 随表层土壤含水量的变化趋势以及相对土面蒸发强度与作物叶面积指数LAI的关系作了详细分析。

Evaporation from soil between crops is one of the important parameters for field water balance calculation. The ratio of evaporation from soil to the total evapotranspiration during growth stages for spring corn is determined by observation of daily variation process of evaporation from soil during growth stages of spring corn using mini_lysimeter. The variation trend of the ratio of evaporation from soil to pan evaporation E/ET0 with the surface soil moisture and the relationship between evaporation from soil and leaf area index LAI are also analyzed.