Spatial-temporal Patterns of Species Diversity in Ecological Forests of Zhejiang

Spatial and temporal patterns of species diversity in evergreen broadleaved forest,coniferous and broadleaved mixed forest,pine forest,Chinese fir forest in Zhejiang Province was investigated by 380 typical sample plots.The results showed that the highest arbor layer diversity in evergreen broadleaved forest and coniferous and broadleaved mixed forest.For species diversity in understory layer,the richest was in coniferous and broadleaved mixed forest,followed by evergreen broadleaved forest.However,the difference of understory diversity indices among various forests was not significant.In herb layer,Chinese fir forest had the highest diversity indices,in contrast,pine forest had the lowest.Diversity indices of different forest communities were varied with forest age based on the analysis of temporal patterns.For tree species(S),evergreen broadleaved forest and coniferous and broadleaved mixed forest had same trends with age of the fooest,but coniferous forest had stable species numbers.For Simpson dominance index(D),evergreen broadleaved forest and coniferous and broadleaved mixed forest had same trends over time,and both of them had higher D than pine forest and Chinese fir forest in the same age classes.For Shannon-Wiener diversity index(H′),evergreen broad leaved forest and coniferous and broadleaved mixed forest had higher significantly tree layer than coniferous forest in same age class.Evergreen broad-leaved forest and coniferous and broadleaved mixed forest had rich species composition and high diversity index in ecological service forests.