Abstract: The relationship between plant phylogenetic structure and habitats is an important topic in ecology, which can reveal the mechanisms underlying plant adaptation to environment and community assemblage. To clarify the adaptation of plants to different habitats across wetland, sand dune and gobi at the local scale in arid area, we examined plant phylogenetic structure and its change in different habitats across marsh, salt marsh, sand dune, and gobi in Jiayuguan Caohu National Wetland Park. The results showed that soil moisture, salt content, bulk density, and pH significantly differed across habitats. Consequently, plant phylogenetic structure changed adaptively. The pedigree diversity index of plants in sand dune was the highest, followed by salt marsh, and the lowest for gobi and marsh. Plant species in different habitats had different phylogenetic structure, with the phylogenetic structure in marsh, sand dune and gobi habitats being under aggregation mode and no obvious phylogenetic structure in salt marsh. At the local scale, environmental filtering was the main factor affecting species distribution in marsh, sand dune, and gobi, while both competition exclusion and habitat filtering affected species distribution in salt marsh.

Key words: soil fungi, Phyllostachys violascens stand,  , soil layer., fertilization mode, community characteristic