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首页> 外文期刊>Hydrological Processes >A Simple Method Using Climatic Variables To Estimate Canopy Temperature, Sensible And Latent Heat Fluxes In A Winter Wheat Field On The North China Plain
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A Simple Method Using Climatic Variables To Estimate Canopy Temperature, Sensible And Latent Heat Fluxes In A Winter Wheat Field On The North China Plain

机译：利用气候变量估算华北平原冬小麦冠层温度，感热通量和潜热通量的简单方法

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摘要

Estimation of evapotranspiration from a crop field is of great importance for detecting crop water status and proper irrigation scheduling. The Penman-Monteith equation is widely viewed as the best method to estimate evapotranspiration but it requires canopy resistance, which is very difficult to determine in practice. This paper presents a simple method simplified from the Penman-Monteith equation for estimating canopy temperature (T_c). The proposed method is a biophysically-sound extended version of that proposed by Todorovic. The estimated canopy temperature is used to calculate sensible heat flux, and then latent heat flux is calculated as the residual of the surface energy balance. An eddy covariance (EC) system and an infrared thermometer (IRT) were installed in an irrigated winter wheat field on the North China Plain in 2004 and 2005, to measure T_c, and sensible and latent heat fluxes were used to test the modified Todorovic model (MTD). The results indicate that the original Todorovic model (TD) severely underestimates T_c and sensible heat flux, and hence severely overestimates the latent heat flux. However, the MTD model has good capability for estimating T_c, and gives acceptable results for latent heat flux at both half-hourly and daily scales. The MTD model results also agreed well with the evapotranspiration calculated from the measured T_c.
机译：估算农田的蒸散量对于检测作物的水分状况和适当的灌溉计划至关重要。 Penman-Monteith方程被广泛认为是估算蒸散量的最佳方法，但它需要耐顶篷性，在实践中很难确定。本文提出了一种从Penman-Monteith方程简化的简单方法来估算树冠温度（T_c）。所提出的方法是Todorovic提出的方法的生物物理扩展版本。估算的冠层温度用于计算显热通量，然后将潜热通量计算为表面能平衡的残差。 2004年和2005年在华北平原灌溉的麦田上安装了一个涡旋协方差（EC）系统和一个红外温度计（IRT），以测量T_c，并使用感热通量和潜热通量来测试改进的Todorovic模型（MTD）。结果表明，原始的Todorovic模型（TD）严重低估了T_c和显热通量，因此严重高估了潜热通量。但是，MTD模型具有良好的T_c估算能力，并且在半小时和每日尺度下都可以给出可接受的潜热通量结果。 MTD模型结果也与根据测得的T_c计算出的蒸散量非常吻合。

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