Characteristics of vegetation types and distributions around the Red River,Vietnam

Based on the investigation about vegetation,environment,soil,physiognomy etc.around the Red River carried out by the cooperation of China,Japan and Vietnam in 2007 and former researches,this paper summarized the distributions of vegetation around the Red River on geomorphology for finding the potential resource of plant chippings and microfossils of sediments in catchments basin.The results showed that:(Ⅰ)vegetation in Fansipan mountain-valley region was obviously distributed in vertical zones.There were tropic rain forest,monsoon rain forest,upland rain forest,subtropical evergreen broad-leaved forest,mountainous mossy forest,temperate broad-leaved forest,coniferous and broad-leaved forest,mountainous shrubbery and grassland from the bottom to the top of mountains;(Ⅱ)riverbed-floodplain-bank of river:hydrophytes and swamp plant-grass and shrub;tropic trees;(Ⅲ)delta plain-mud foreshore:swamp forest-mangrove. And the bamboo or pine forest and grassland were the major secondary vegetations of those burned forests.