Chenier Islands is an important geological phenomenon occurred during the continent building process since approximately 5 000~6 000 years ago on the west and northwest of Bohai Bay.As a natural protection

the Chenier in Wudi coast of the Yellow River Delta played an important role in securing human life and property.In this article

species composition and plant diversity in the area of Dakouhe River and Wangzi Island were investigated.The results show that 32 species of plants

beloging to 13 families

and 29 genera were found in the area.The aridisphytes

mesophytes and plants of high salt tolerance were the dominant species.Along the section from seaside

shell ridge to landside

the species richness and biodiversity index significantly increased

as well as distributional evenness index

Simpson index

and Shannon—Wiener index.Due to human disturbance

the species in Dakouhe River were far less than that in Wangzi Island area.However

the evenness index decreased from east to west in both areas.In temporal scale

the most abundant species were found in August owing to sufficient rainfall and high temperature.