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Accueil du site → Master → Chine → 2019 → Study of Governance and Characteristics of Desertification in Red Beds in Yongyang Basin,Ji’an,Central Jiangxi Province

Université de technologie de Chine orientale (2019)

Study of Governance and Characteristics of Desertification in Red Beds in Yongyang Basin,Ji’an,Central Jiangxi Province

程陈艳;

Titre : Study of Governance and Characteristics of Desertification in Red Beds in Yongyang Basin,Ji’an,Central Jiangxi Province

Auteur : 程陈艳;

Grade : Master’s Theses 2019

Université : Université de technologie de Chine orientale

Résumé
Due to the special lithology of red beds and under the humid and rainy climatic conditions,the lithology of red beds soft rock affects ability and rate of anti-erosion and anti-weathering,after losing the surface soil layer.After the red beds soft rock is exposed to the surface,its erosion rate is affected by the factors of sunshine and rainfall.Sunshine and continuous rainfall alternate.The red bed soft rock disintegrates and fragments continuously from its original state,forming the red beds desertification landscape.Desertification is characterized by erosion of surface soil as the initial sign and dense erosion gully(chicken claw gully)as the typical sign.The eroded area of red soil in Jiangxi province ranks third among eight red soil provinces in the south,and the exposed area of red desertification is extensive,which seriously affects ecological stability and sustainable economic development.Yongyang basin,a secondary red bed basin with typical desertification characteristics in Jitai basin,Jiangxi province,was selected as the research object.Based on field geological investigation,image analysis,soil profile survey and physical and chemical characteristics analysis,combining desertification spatial distribution with basin sedimentary facies types,clarify the types and characteristics of erosion gullies in the process of desert evolution in red beds and changes of soil physicochemical properties in different evolution stages,revealing influencing factors of red-bed desertification,to provide scientific basis for desertification control,developing desertification aesthetic value and popular science value into tourism resources,creating desertification as the subject of geo-tourism cultural village,It’s conducive to the protection of ecological environment and the maintenance of sustainable economic development.The key results were as follows :(1)Yongyang basin is a basin by continental sedimentary,Cretaceous sandstone,siltstone and mudstone are exposed in the margin of the basin,Quaternary reticulated laterite is exposed in the basin,It mainly develops fluvial alluvial facies and residual-slope facies.Restricted by lithological factors,most of the desertification areas(points)are exposed in the Quaternary alluvial and residual-slope strata with the weakest erosion resistance.(2)The desertification in this area mainly takes four forms on the image : the "maple leaf shape" accumulates and distributes to both sides of the mountain area ;in low-lying hills,the trend of expansion is transverse and then longitudinal,and the expansion speed is "flaky" ;In flat and open terrain,desertification is "star-shaped" with lateral expansion,

Mots clés : Yongyang basin; Red beds desertification; Desertification characteristics; Desertification control;

Présentation (CNKI)

Page publiée le 28 avril 2020