覆膜旱作水稻蒸发蒸腾量计算模型研究

摘要

在利用蒸渗仪进行覆膜旱作水稻需水量现场试验中，应用时域反射仪TDR和植物冠层图像分析仪CI-100等仪器设备，系统地观测了覆膜旱作水稻各生育阶段的冠层结构及土壤水分等试验数据.鉴于冠层叶面积指数CLAI的动态变化对水稻蒸发蒸腾量的显著影响，提出了覆膜旱作水稻蒸发蒸腾量理论模型的3种计算公式，并用蒸发蒸腾量实测值进行了方差检验，均达到极显著水平.%On the basis of field experiment of water requirement of rice in plastic film mulched dryland (RPFMD) with lysimeters, by use of Time Domain Reflectometry TDR and Digital Plant Canopy Imager CI-100, soil water contents and canopy structures of RPFMD in different growth stages are systemically measured. Owing to the significant effects of the development of canopy leaf area index CLAI on rice evapotranspiration, 3 calculation formulae are proposed of the theoretical model of evapotranspiration of RPFMD,and the formulae are verified by measured data.The results indicate that F tests reach significant levels,and that the formulas are accurate.