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Northwest A&F University (2022)

The Water Consumption Characteristics and Model Simulation of Agroforestry Ecosystem in Loess Plateau

张静

Titre : The Water Consumption Characteristics and Model Simulation of Agroforestry Ecosystem in Loess Plateau

Auteur : 张静

Grade : Doctoral Dissertation 2022

Université : Northwest A&F University

Résumé partiel
Land use type is one of the important factors affecting the soil water cycle in Loess Plateau.In recent years,under the needs of economic transformation in the Loess Plateau,a large area of wheat and corn field has been transformed into apple orchard.However,the evapotranspiration of apple orchard is far greater than precipitation supply,resulting in the reduction of water resources that are available for apple trees.Then the normal growth of apple trees is limited,leading to the reduction of the yield and quality of apples.Therefore,it is necessary to analyze water consumption characteristics and the soil water conditions of continuous cropping apple trees,spring corn and winter wheat in the Loess Plateau under the conditions of land transformation and climate fluctuation.It will provide a theoretical basis for optimizing the management measures in the process of agricultural production and the sustainable utilization of soil water in the Loess Plateau.In response to the above problems,Changwu tableland,a typical representative of the Loess Plateau,were selected as the research area in this study.Apple orchards with different forest ages under the same management measures,corn field and wheat field were taken as the research objects.Then the field experiment and Root Zone Water Quality Model(RZWQM2)were combined to do the research as the objects as below:Analyzed the evapotranspiration characteristics of apple orchard under different time scales ;Obtained the calculation method of evapotranspiration and the water consumption characteristics in corn and wheat fields under continuous cropping mode ;Clarified the dynamic characteristics of soil moisture in the apple orchards with the increasing age(corresponding to apple tree ages of 7,8,9,10,17,18,19,and 20) ;Discussed the effect of apple orchard on soil moisture to the adjacent cropland land ;And explored the feasibility of RZWQM2 in simulating soil water of apple orchard,and then analyze the water supply and demand of agroforestry ecosystem under the condition of climate fluctuation using the model

Mots clés : Loess Plateau ;Agroforestry ecosystem ;Transpiration scale expansion ;soil water conditions ;Model simulation ;

Présentation (CNKI)

Page publiée le 18 octobre 2022