基于短波红外的丹霞山岩壁裸露特征OA北大核心CSTPCD

Mount Danxiashan exhibits a significant red beds landform,which is formed of red sand-stones and conglomerates.The exposed rock wall reflectance and regional area changes of Mt.Danxiashan(exposed characteristics)are affected by complex environmental factors.In this study,we quantified the reflectance of the red rock wall of Mt.Danxiashan through field measurements,extracted SWIR from Sentinel-2 satellite remote sensing data,and further identified the area changes of the exposed rock wall.Furthermore,we calculated the NDVI and collected the climate data from 2018 to 2022,aiming to discuss the spatio-temporal variations of characteristics of exposed palisades in Mt.Danxiashan in different scales by combining biotic environments and abiotic environments.Our results show that the reflectance of the exposed rock wall of Mt.Danxiashan is lower in the MAM and JJA,and higher in the SON and DJF,namely the brightness of the red beds is higher during these periods.The area of exposed rock wall varies little among the years from 2018 to 2022 but greatly among sea-sons,indicating that the exposed area is highest during the SON and DJF.The exposed features in Zhanglaofeng area are jointly affected by abiotic and biotic factors at different scales.The area changes of the exposed rock wall are mainly influenced by the climate-dominated growth of vegetation at a large scale.The color feature indicated by the reflectance of the exposed rock wall is mainly controlled by water and the surface biota at the micro-level.