Trees to arrest sand-shifting have been planted on most of coastal dunes in Korea and considered as conservative objects.However,we reconsider that the simplicity of these trees have hindered ecological roles of coastal dunes; geochemical cycle and habitats of endemic species in coastal ecosystem.We examined geochemical properties of sediments on Byunsuran dune field where is planted with pine trees.There are significant difference in properties between embryo dune sediments and foredune sediments,but there are not between foredune and secondary dune.There are no significant difference between pine forest sediments and mixed forest sediments.It is also not showed the difference between dune ridge sediments and swale sediments.Despite spatial diversity from appearance,geochemical properties are not linked with geomorphic and vegetation conditions because of dense planted trees on foredune.To recover natural properties of coastal dunes,we need to change the conservation scheme to increase geomorphic and ecological diversity.