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首页> 外文期刊>Journal of the American Water Resources Association >Comparison of Evapotranspiration Simulation Performance by APEX Model in Dryland and Irrigated Cropping Systems
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Comparison of Evapotranspiration Simulation Performance by APEX Model in Dryland and Irrigated Cropping Systems

机译：旱地和灌溉制度下APEX模型蒸散模拟性能的比较。

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摘要

Accurate estimation of evapotranspiration (ET) is essential to improve water use efficiency of crop production systems managed under different water regimes. The Agricultural Policy/Environmental eXtender (APEX) model was used to simulate ET using four potential ET (ETp) methods. The objectives were to determine sensitive ET parameters in dryland and irrigated cropping systems and compare ET simulation in the two systems using multiple performance criteria. Measured ET and crop yield data from lysimeter fields located in the United States Department of Agriculture-Agricultural Research Service Bushland, Texas were used for evaluation. The number of sensitive parameters was higher for dryland (11-14) than irrigated cropping systems (6-8). Only four input parameters: soil evaporation plant cover factor, root growth soil strength, maximum rain intercept, and rain intercept coefficient were sensitive in both cropping systems. Overall, it is possible to find a set of robust parameter values to simulate ET accurately in APEX in both cropping systems using any ETp method. However, more computation time is required for dryland than irrigated cropping system due to a relatively larger number of sensitive input parameters. When all inputs are available, the Penman-Monteith method takes the shortest computation time to obtain one model run with robust parameter values in both cropping systems. However, in areas with limited datasets, one can still obtain reasonable ET simulations using either Priestley-Taylor or Hargreaves. Editor's note: This paper is part of the featured series on Optimizing Ogallala Aquifer Water Use to Sustain Food Systems. See the February 2019 issue for the introduction and background to the series.
机译：准确估算蒸散量（ET）对于提高在不同水情下管理的作物生产系统的用水效率至关重要。使用农业政策/环境扩展程序（APEX）模型使用四种潜在的ET（ETp）方法来模拟ET。目的是确定旱地和灌溉作物系统中的敏感ET参数，并使用多种性能标准比较两个系统中的ET模拟。来自位于德克萨斯州布什兰市的美国农业-农业研究服务局的溶渗仪测量的ET和作物产量数据用于评估。旱地（11-14）的敏感参数数量高于灌溉耕作系统（6-8）的敏感参数数量。在这两个种植系统中，只有四个输入参数：土壤蒸发植物覆盖因子，根系生长土壤强度，最大降雨截留和降雨截留系数是敏感的。总体而言，有可能找到一组鲁棒的参数值，以使用任何ETp方法在两个作物系统的APEX中准确地模拟ET。但是，由于敏感输入参数的数量相对较多，与灌溉种植系统相比，旱地需要更多的计算时间。当所有输入均可用时，Penman-Monteith方法将花费最短的计算时间来获得在两个裁剪系统中均具有可靠参数值的模型运行。但是，在数据集有限的地区，仍然可以使用Priestley-Taylor或Hargreaves获得合理的ET模拟。编者注：本文是“优化Ogallala含水层用水以维持食品系统”专题系列的一部分。有关该系列的简介和背景信息，请参见2019年2月号。

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