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Lanzhou Jiaotong University (2021)

Study on Vegetation Pattern Dynamics and Soil Hydrological Characteristics of Plaque in Desert-Oasis Transition Zone

李浩然

Titre : Study on Vegetation Pattern Dynamics and Soil Hydrological Characteristics of Plaque in Desert-Oasis Transition Zone

Auteur : 李浩然

Grade : Master 2021

Université : Lanzhou Jiaotong University

Résumé partiel
Desert oasis in arid zone of northwest China transition zone,the main vegetation landscape pattern as the patch shape,vegetation structure is simple,the influence of climate and water in arid areas,vegetation to resist outside interference ability is weak,but its role for windbreak and sand-fixation,therefore,in this paper the dynamic changes of the desert oasis vegetation pattern transition zone plaques and its soil hydrological properties as the research object,The 3S technology was used to analyze the vegetation landscape pattern of the study area in 2010,2015 and 2020.At the same time,the characteristics of soil moisture evapotranspiration,soil moisture content and soil moisture infiltration in 2010,2015 and 2020 in the study area were studied by using MODS satellite remote sensing images and measured observation data.The relationship between vegetation pattern and soil moisture evapotranspiration,soil moisture content and soil moisture steady infiltration rate were analyzed by using grey relational degree method.The main research results are as follows :(1)The landscape with higher landscape dominance in 2010 was the landscape with higher vegetation cover,the landscape with higher vegetation cover in 2015,and the landscape with higher vegetation cover in 2020 ;The landscape fragmentation degree of medium vegetation cover and low vegetation cover is relatively serious,while the landscape fragmentation degree of high vegetation cover is the lowest.(2)At the landscape level,the vegetation landscape patches are mainly small patches.From 2010 to 2020,the landscape with higher vegetation coverage has the largest average patch area in 2020,with an average patch area of 7.68hm2.The characteristics of the landscape in the study area are as follows : high heterogeneity,serious fragmentation,easy to produce edge effect and high neighborhood degree of landscape type.

Mots clés : patch vegetation pattern ;Dynamic change ;Soil moisture evapotranspiration ;Soil moisture content ;Soil water infiltration rate ;

Présentation (CNKI)

Page publiée le 21 février 2022