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Evaluation of Penman-Monteith model applied to a maize field in the arid area of northwest China

机译：Penman-Monteith模型在西北干旱地区玉米田中的评价

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The Penman-Monteith (P-M) model has been applied to estimateevapotranspiration in terrestrial ecosystem throughout the world. As shownin many studies, bulk canopy resistance is an especially important factor inthe application of the P-M model. In this study, the authors used theNoilhan and Planton (N-P) approach and the Jacobs and De Bruin (J-D)approach to express the bulk canopy resistance. The P-M model was applied toa maize field using the two approaches in an arid area of northwest Chinaand evaluated on the basis of measured half-hourly values from the eddycovariance system. The results indicate that the N-P approach slightlyunderestimates the bulk canopy resistance, while the J-D approachoverestimates it. Over the entire maize growing season, the N-P approachyielded a more consistent estimate of bulk canopy resistance than did theJ-D approach. Correspondingly, the P-M model with J-D bulk canopy resistanceslightly underestimated the latent heat flux throughout the maize growingseason, but overestimated the latent heat flux during the dry season ascompared to the N-P approach results. The good fit between the simulatedlatent heat flux estimated by the P-M model using the N-P approach and thedata measured at half-hour time steps demonstrates that the application ofthis approach is reasonable in relatively homogenous maize fields that arenot drought-stressed. Further research to improve the performance of P-Mmodel to simulate evapotranspiration in the cropped fields is discussed.
机译：Penman-Monteith（P-M）模型已被用于估算全世界陆地生态系统中的蒸散量。如许多研究所示，在使用P-M模型的过程中，抗树冠性是一个特别重要的因素。在这项研究中，作者使用了Noilhan和Planton（N-P）方法以及Jacobs和De Bruin（J-D）方法来表达整体冠层阻力。将P-M模型通过两种方法应用于西北干旱地区的玉米田，并基于涡度方差系统测得的半小时测量值进行了评估。结果表明，N-P方法略微低估了整体冠层阻力，而J-D方法则高估了其整体阻力。在整个玉米生长季节，与J-D方法相比，N-P方法对整体冠层抗性的估计更为一致。相应地，具有J-D散装冠层阻力的P-M模型略微低估了整个玉米生长季节的潜热通量，但与N-P方法相比，高估了干旱季节的潜热通量。由P-M模型使用N-P方法估算的模拟潜热通量与半小时时间步长测量的数据之间的良好拟合表明，该方法在相对干旱且没有干旱的玉米田中的应用是合理的。讨论了进一步研究以提高P-M模型的性能以模拟作物田中的蒸散量。

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