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North China Electric Power University (华北电力大学) 2021

Research on Pattern Dynamics of the Interaction between Wind Erosion and Vegetation

吴选文

Titre : Research on Pattern Dynamics of the Interaction between Wind Erosion and Vegetation

Auteur : 吴选文

Grade : Master 2021

Université : North China Electric Power University (华北电力大学)

Résumé partiel
In order to solve the deterioration prolem of ecological environment caused by erosion,scholars have introduced nonlinear methods into the field of erosional ecology.Aiming at the issue of the evolution of sand dune vegetation in arid or semi-arid areas,this thesis constructed a dynamic model based on the interactions between wind erosion and vegetation,explored the pattern formation and stability mechanism of the vegetation and sand dunes in wind-eroded areas,and discussed the complex dynamical behaviors of the wind erosion-vegetation system and the impact of system parameters changes on the system behavrios.The main research results are as follows :(1)By analyzing the complex interactions between vegetation and wind erosion,time-and space-continuous and discrete dynamic models were constructed.Through stability and Turing instability analysis,the coexistence states and pattern formation conditions of vegetation and wind erosion were determined.(2)It was found that the wind erosion-vegetation system can generate hot patterns in the Turing area and the Turing-Hopf area by analysis.The occurrence of hot pattern can correspond to the dune landform in natural wind-eroded area.The bifurcation analysis on the spatiotemporally discrete dynamic model showed that the vegetation and wind erosion may exhibit periodic and chaotic dynamic changes

Mots clés : Wind erosion ;sandy vegetation ;dynamic model ;pattern dynamics ;bifurcation analysis ;

Présentation (CNKI)

Page publiée le 19 mars 2022