Research on field water consumption is critical for optimizing crop growth and policy-making, in which the computer models play an increasingly important role. As a water-driven crop model, the AquaCrop model has been used in a large number of studies since its launch in 2009. However, how the model performs in predicting the ecohydrological process of farmland under film-mulched drip irrigation is still unclear, especially its application on partitioning crop evapotranspiration is very rarely reported. To make up for the above insufficiency, maize experiments were conducted under full mulch drip irrigation with observation instruments of eddy covariance systems, heat balance stem-flow gauges, micro-lysimeters and other tools, during seasons of 2014–2018. The AquaCrop model was first calibrated using measured data in 2014, and subsequently validated with data in 2015–2018. Results indicate that the parameterized model could precisely simulate the canopy cover ( $${R}^{2}$$ = 0.97), biomass ( $${R}^{2}$$ = 0.99) and grain yield (standard deviation was 4.13%), as well as reflect the patterns of daily variation in transpiration and evapotranspiration with satisfactory $${R}^{2}$$ of 0.91 and 0.87, respectively. Nevertheless, the $${R}^{2}$$ values of soil water content and evaporation were not good, ranging between 0.23 and 0.45, and 0.26 and 0.75, respectively. The AquaCrop model adopts canopy cover instead of leaf area index to describe the growing process of crops; this is an important innovation for model extension and application but also may lead to some inaccuracies in water balance simulation. Summarizing, this study shows that the AquaCrop model is appropriate for supporting crop production but not for predicting the soil moisture content and evaporation variation for maize under film-mulching drip irrigation.

中文翻译：

---

西北地区全滴灌地膜玉米AquaCrop模型性能评价

田间耗水研究对于优化作物生长和决策至关重要，其中计算机模型发挥着越来越重要的作用。AquaCrop模型作为一种以水为驱动的作物模型，自2009年推出以来，已被大量研究使用，但该模型在膜膜滴灌下农田生态水文过程预测中的表现尚不清楚，尤其是它在分配作物蒸散方面的应用很少被报道。为弥补上述不足，在2014-2018年的季节，利用涡流协方差观测仪、热平衡茎流仪、微蒸渗仪等工具在全覆盖滴灌下进行了玉米试验。AquaCrop 模型于 2014 年首次使用测量数据进行校准，并随后用 2015-2018 年的数据进行了验证。结果表明，参数化模型可以精确模拟冠层盖度（$${R}^{2}$$ = 0.97）、生物量（$${R}^{2}$$ = 0.99）和粮食产量（标准差为 4.13%），并且反映了蒸腾和蒸发蒸腾的每日变化模式，令人满意的 $${R}^{2}$$ 分别为 0.91 和 0.87。尽管如此，土壤含水量和蒸发的$${R}^{2}$$ 值并不好，分别在0.23 和0.45 之间，以及0.26 和0.75 之间。AquaCrop 模型采用冠层覆盖代替叶面积指数来描述作物的生长过程；这是模型扩展和应用的重要创新，但也可能导致水平衡模拟的一些不准确。总结一下，