T hrough investigating the main species of different communities in the wind-sandy grass shoal area of Yulin Region

5 representative areas were selected according to vegetation

site factor

and soil water content.Species richness

species diversity

and the evenness of community were comprehensively calculated by using richness index ( R1)

Shannon - Weiner index ( H )

Simpson index ( D)

and evenness index ( E 1) .Meanwhile

the relations of the important value of the main species and soil water content to species diversity were studied.The communities in the wind -sandy grass shoal area of Yulin Region

in terms of the species diversity

rank in the descendent order of Amorphaf raticosa community

Caragana intermedia community

H edysarum scop arium community

Salix cheilop hila community

and A rtemisia arenaria community.However

they

in terms of the evenness of community

rank in the descendent order of Salix cheilophila community

A morp ha f raticosa community

Caraganaintermedia community

Hedysarum scop arium community

and A rtemisia arenaria community.They

in terms of soil water content

rank in the descendent order of A morp ha f raticosa community

Artemisia arenaria community

Caragana intermedia community

and H edysarum scoparium community.