Studies on Type Classification and Tree Species Diversity for the Castanopsis fargesii Secondary Forest in the Hongdong Forest Farm of Fujian Province
- Received Date: 1997-10-19
- Available Online: 2012-03-17
Abstract: Castanopsis fargesii secondary forest in the Hongdong Forest Farm of Fujian Province was studied,the results showed:(1) C.fargesii secondary forest was classified into five types based on the species diversity of stand and the degree of perturbation,such as A type,it consists of C.fargesii or C.fargesii+Schima superba (a few),B type consists of C.fargesii+C.fabri (a few);C type consists of C.fargesii+S.superba (a few)+ C.fabri (a few);D type consists of C.fargesii+C.fabri (a few)+ S.superba (a few);E type consists of S.superba+C.fargesii+C.fabri (a few);(2)Tree species diversity index varies with the degree of perturbation,the diversity of the A and B type communities is the lowest among the five types because of severe perturbation,the next is C type,the diversity of the D and E type communities is the highest among all types which are lightly perturbed;(3)Its diversity index also varies with the stand age,it is the higher in 16 a,the highest in 23 a,but when the stand age is 36 a,the diversity index dereased for the interspecific competition;(4)The height niche breadths of different tree species are calculated in young growth,and their niche overlaps are analysed as well;(5)In this paper,on the basis of prices niche breadth formula,the calculating formula of the height niche breadths of forest communities are advanced as follows:B=1/ΣPi2(S)(Ⅳ).