| Cite this article: | 肖璐,崔宁博,赵璐,等.西北地区夏玉米不同生育期蒸发蒸腾量模拟模型适用性评价[J].灌溉排水学报,0,():-. |
| XIAO Lu,CUI Ningbo,ZHAO Lu,et al.西北地区夏玉米不同生育期蒸发蒸腾量模拟模型适用性评价[J].灌溉排水学报,0,():-. |
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| This article has been：Browse 2018Times Download 0Times |
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| Applicability Evaluation of Evapotranspiration Estimate Models for Different Growth Stages of Summer Maize in Northwest China |
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XIAO Lu1,2,3, CUI Ningbo1,2,3,4,5,6, ZHAO Lu1,2,3, CAI Huanjie4,5, HU Xiaotao4,5, ZHANG Nian1,2,3, ZHANG Fujuan1,2,3, HU Haibo7, YANG Dewen7, LE Jinhua8
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1.State Key Laboratory of Hydraulics and Mountain River Engineering &2.amp;3.College of Water Resources and Hydro Power,Sichuan University;4.Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&5.F University;6.Provincial Key Laboratory of Water-Saving Agriculture in Hill Area of Southern China;7.Sichuan Panzhihua Academy of Agricultural and Forestry Sciences;8.Beijing Insentek Company
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| Abstract: |
| 【Objective】Evapotranspiration (ET) is the main parameter of agricultural production. Estimating ET accurately is of great significance to precise water management on farmland and optimal allocation of regional water resources.【Method】In this study, summer maize crop index and meteorological factors from 2012 to 2013 were used to simulate ET by empirical models (Schendel, Hargreeves-M4 (H-M4)) of crop reference evapotranspiration (ET0) based on single crop coefficient approach, single source model (Priestley-Taylor (P-T) and double sources models (Shuttleworth-Wallace and Two-Patch). The simulation of each estimation model was compared and analyzed.【Result】Coefficient a of P-T model was modified by the ratio between the measured and equilibrium ET mean in different growth stages. The predicted ET values of modified P-T model were in agreement with the measured values of large-scale weighing lysimeter with MAE, R2, MRE, RRMSE and GPI ranking of 0.9775mm/d, 0.5689, 0.8434, 0.4504 and 1 in the whole summer maize growth period, 0.9592mm/d, 0.3320, 0.4784, 0.4811 and 3 in seedling stage, 1.0388mm/d, 0.5078, 0.5517, 0.4290 and 1 in jointing and tasseling stage and 0.5481mm/d, 0.7746, 0.9158, 0.4239, 0.6921 and 1 in mature stage, respectively. The predicted ET values of H-M4 model were in agreement with the measured values with MAE, R2, MRE, RRMSE and GPI ranking of 1.3443mm/d, 0.7279, 2.2983, 0.4910 and 1 in filling stage. The simulation results all reached extremely significant level (P<0.01).【Conclusion】Both P-T and H-M4 based on the single crop coefficient approach have the advantage of obtaining more accurate ET estimates with fewer input. Therefore, P-T can be used as the optimal model for ET simulation in the whole growth period, seedling stage, jointing and tasseling stage and mature stage. H-M4 can be used as the optimal model for ET simulation in filling stage. This study can provide scientific reference for the accurate estimation of ET of summer maize in Northwest China. |
| Key words: evapotranspiration; Northwest China; summer maize; evapotranspiration estimate model; large-scale weighing lysimeter |
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