In order to understand forest community structure

species diversity and their changing dynamicsand therefore to provide a reliable basis for effective biodiversity conservation

the natural secondary forest inBeigou forest farm

Weichang County

Hebei Province was selected to investigate forest communities structure and species diversity including Raunkiaer life-form

diversity index

etc.The results showed that thestudy area had vegetation resources of 117species belonging to 58families and 99genera.Phanerophytesdominated in the communities

followed by geophyte

while other kinds of plant showed no obvious advantages.The internal lamellar structure of the community was complex

as dominated by phanerophytes lamellarand in high bud lamellar.The richness index for each plant communities could 0 be ranked in a descending order as herb layer>shrub layer>tree layer.The diversity index differed among different layers.The evennessindex varied significantly between the layers of species

in the descending order as herb laye>shrub layer>tree layer.