Species Diversity of Shrub Layer in Forest Communities,Guangdong Province in South China

The diversity of species in forestry community plays an important role in maintaining forestry community stability,development and succession as well as in evaluating forest carbon sequestration. Species composition and diversity for shrubbery in different climatic zone were analyzed based on the Margalef index,ShannonWiener index and Pielou index by using quadrant method in Guangdong province. The results showed that,shrub plant belonged to 68 families 156 genera and 302 species in mid-subtropics,58 families 140 genera and 225 species in south subtropics and 20 families 27 genera 29 species in north tropic. Plant density and average height decreased from north to south,moreover,Rhodomyrtus tomentosa was the main composition of shrub in Guangdong. Richness index and diversity index didn' t show significant difference between artificial and natural forest in the mid- and south subtropical climatic zone. In addition,richness index and diversity index in artificial forest decreased gradually with the decrease of latitude,but evenness index was on the contrary.