Study On The Characteristics Of Danxia Landform And The Factors Of Formation In Jiangxi Province

The research of Danxia landform has a history of more than 90 years and a large number of domestic and foreign researches have focused on qualitative description of landform features,microscopic quantitative experiments,spatial distribution and geomorphic genesis.Danxia landform research is moving from qualitative to quantitative and macroscopic to microscopic,but quantitative research is still scarce.This paper aims to quantitatively study the landscape features,remote sensing image features,evolution stage,and elements of landscape of the Danxia landform in Jiangxi Province by adopting 3S technology,hypsometry,Geodetector and other methods,and combining with field surveys.The main conclusions are as follows:(1)The Danxia landforms in Jiangxi Province are mainly concentrated in the red bed basins distributed along the northwest side of the Wuyishan arc uplift zone,showing an agglomeration distribution pattern.The Danxia landform landscape shows brown gray and brown red under the true-color RGB(4,3,2)band of the Sentinel-2 remote sensing image,and images orange-yellow and orange-red under the false-color RGB(12,4,3)band.Based on this,the Danxia landform distribution area can be effectively identified.The landform types of Danxia in Jiangxi Province are diverse.According to the morphological characteristics,they are divided into 9 positive landforms,2 negative landforms,and 4micro landforms.(2)Danxia landform landscape formation system in Jiangxi Province can be quantitatively analyzed by using Geodetector methods.The analysis results of the factor detector show that,based on the extent of effect,stratum gives the most significant influence on the Danxia landform distribution and the followings respectively are structure,river and terrain.Interactive detection instrument shows that the stratum and structure jointly have the greatest impact on the Danxia landform.The structure controls the deposition of the red layer and the development of the Danxia landform.The distribution of the red layer material determines the distribution of the Danxia landform.The flowing water plays an important role in shaping the Danxia landform landscape.The topography affects the external dynamic conditions and further affecting the Danxia landform landscape.(3)Using the hypsometry method quantitatively analyze the landform evolution stage of the red bed and Danxia landform areas in Jiangxi Province.The results show that the landform evolution stage of the red bed and Danxia landform areas has a distribution characteristic of gradually being old from south to north.From south to the north,the landform evolution stage of red layer area in the eastern and central regions is from the late stage of mature age to the early stage of old age.And the red layer region in the west region was dominated by the old age.This paper analyzes the spatial distribution characteristics,landform characteristics,landform evolution stages and landscape factors of Danxia landform in Jiangxi Province by using 3S technology,field survey and quantitative Geodetector and hypsometry method.And good results were obtained,which indicates that these quantitative analysis methods are suitable for the quantitative research of Danxia landform evolution stage,landform features and formation factors.