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Lanzhou University (2019)

Application of Different Canopy Resistance Models in Evapotranspiration of Maize Ecosystem in Semi-arid Areas

李玲;

Titre : Application of Different Canopy Resistance Models in Evapotranspiration of Maize Ecosystem in Semi-arid Areas

Auteur :

Grade : Master’s Theses 2019

Université : Lanzhou University

Résumé partiel
In the study of crop evapotranspiration,there are many estimation models,and the most widely used single-source model is the Penman-Monteith(PM)model.This paper optimizes the PM model by improving the canopy resistance parameters,thereby improving the PM model for sparse vegetation.The simulation effect of evapotranspiration makes the simulation simple but accurate.Therefore,this paper mainly optimizes the estimation of crop evapotranspiration by evaluating the different canopy resistance models(or surface resistance models)and selecting the resistance model suitable for the whole growth season of corn.In this paper,10 more classical canopy resistance models are selected,and the whole growing season is divided into the pre-growth season(LAI<2)and the late growing season(LAI>2).The canopy resistance model is combined with the PM model to discriminant model applicability.At the same time,the influence of parameters on the model is analyzed,and the sensitivity of the model is analyzed.Finally,the following conclusions are drawn :(1)In the early stage of the growing season,through the analysis of the calculation results and the evaluation of the model,it is concluded that the model with the best performance at this stage has the coupled surface resistance(CO)model,the modified Leuning(RL correction)model and Katerji-Perrier(KP)model.(2)In the later part of the growing season,combined with the analysis of the estimation results and the evaluation of the model,the best model for the canopy resistance simulation of corn in this study area at this stage is the Stannard(ST)model,Leuning(RL)model and Jarvis model,and in addition to the RL correction model in this period,the other model simulation results are good and superior to the pre-growth season.(3)The most suitable resistance model in the whole growing season of corn in this study area is the coupled surface resistance(CO)model and KP model,but the KP model performs slightly poorly in the early growth season.

Mots clés : arid and semi-arid; maize; evapotranspiration; surface resistance; the canopy resistance model; the pre-growth season; the later part of the growing season;

Présentation (CNKI)

Page publiée le 3 juin 2020