Performance assessment of the AquaCrop model for film-mulched maize with full drip irrigation in Northwest China
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ORIGINAL PAPER
Performance assessment of the AquaCrop model for film‑mulched maize with full drip irrigation in Northwest China Qinsi He1,2 · Sien Li1,2 · Dan Hu3 · Yahui Wang1,2 · Xue Cong3 Received: 18 October 2019 / Accepted: 15 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 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 ( R2 = 0.97), biomass ( R2 = 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 R2 of 0.91 and 0.87, respectively. Nevertheless, the R2 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.
Introduction As the newest international water-driven crop model, the AquaCrop model has notable features including few input parameters, wide application range, simple user interface and high simulation accuracy (Raes et al. 2009b; Steduto et al. 2009; Vanuytrecht et al. 2014; Abdalhi et al. 2018). Early in model development, Steduto et al. (2009) illustrated * Sien Li [email protected]; [email protected] * Dan Hu [email protected] 1
Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China
2
Shiyanghe Experimental Station for Improving Water Use Efficiency in Agriculture, Ministry of Agriculture and Rural Affairs, Wuwei 733000, China
3
School of Mathematical Sciences, Institute of Natural Sciences, MOE‑LSC, Shanghai Jiao Tong University, Shanghai 200240, China
the framework systematically, Raes et al. (2009a) introduced the main algorithms, and Hsiao et al. (2009) use
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