The population structure and dynamics of Castanopsis eyrei in the evergreen broad-leaved forest on the Tiantai Mountain of Zhejiang Province were studied by means of spatial sere substituting for time sere. The result...The population structure and dynamics of Castanopsis eyrei in the evergreen broad-leaved forest on the Tiantai Mountain of Zhejiang Province were studied by means of spatial sere substituting for time sere. The results show: the shapes of size-class distribution diagram in various plots of Castanopsis eyrei population are basically similar; the population survival cures are of remarkable linear; the population age structure is stable. The population density of Castanopsis eyrei is reduced with its diameter class becoming larger, and the relevant pattern between density and diameter class is: D= 8.5178 ×104A-1.7497. The distribution patterns in the population plots are indicative of clump. The distribution patterns of seedlings, treelets and saplings in various plots are of clump;medium-sized trees are of clump or possion; big trees are of possion.展开更多
Flora composition and species diversity features of Castanopsis eyrei community at Tiantai Mountain of Zhejiang Province were analyzed.According to the statistics from 10 sample plots,there are 122 species(including v...Flora composition and species diversity features of Castanopsis eyrei community at Tiantai Mountain of Zhejiang Province were analyzed.According to the statistics from 10 sample plots,there are 122 species(including varieties) of 93 genus belonging to 48 families of vascular plants.In terms of geographical composition of seed plant genus,most of them are distributed in the temperate zone.The species diversity of shrub layer is the highest,the tree layer the second ,and the herb layer the lowest in the vertical structure of the community.In terms of the specific-abundance distribution,the tree layer,the shrub layer and the herb layer plants all conform to the logarithmic series distribution,which shows that there are more open species than the enriched species,and that the community evenness is relatively low.The diversity order of the family-genus-species in the community is:genus-species diversity>family-genus diversity>family-species diversity.展开更多
The age structure and dynamics of dominant species Heptacodium miconioides at Tiantai Moduntain in Zhejiang Province were analyzed by adopting the method of "spatial series substituting for time series".The ...The age structure and dynamics of dominant species Heptacodium miconioides at Tiantai Moduntain in Zhejiang Province were analyzed by adopting the method of "spatial series substituting for time series".The results indlicate that the age-class of the Heptacodium miconioides population is incomplete.The population’s survival curves are not linear,and its age structure is declining.The age structure for most of the other dominant populations is also declining,which indicates that the Heptacodium miconioides community is unstable.The species diversity of Heptacodium miconioides community consists in the fact that the woody plants are rich,and the species diversity index is higher than that of the herbs.In terms of species richness distribution,both the woody and herbs fix to the logrithmic scale distributions,which means that the number of the sparse species is bigger than the enriched species,and that the community’s evenness is relatively small.展开更多
文摘The population structure and dynamics of Castanopsis eyrei in the evergreen broad-leaved forest on the Tiantai Mountain of Zhejiang Province were studied by means of spatial sere substituting for time sere. The results show: the shapes of size-class distribution diagram in various plots of Castanopsis eyrei population are basically similar; the population survival cures are of remarkable linear; the population age structure is stable. The population density of Castanopsis eyrei is reduced with its diameter class becoming larger, and the relevant pattern between density and diameter class is: D= 8.5178 ×104A-1.7497. The distribution patterns in the population plots are indicative of clump. The distribution patterns of seedlings, treelets and saplings in various plots are of clump;medium-sized trees are of clump or possion; big trees are of possion.
文摘Flora composition and species diversity features of Castanopsis eyrei community at Tiantai Mountain of Zhejiang Province were analyzed.According to the statistics from 10 sample plots,there are 122 species(including varieties) of 93 genus belonging to 48 families of vascular plants.In terms of geographical composition of seed plant genus,most of them are distributed in the temperate zone.The species diversity of shrub layer is the highest,the tree layer the second ,and the herb layer the lowest in the vertical structure of the community.In terms of the specific-abundance distribution,the tree layer,the shrub layer and the herb layer plants all conform to the logarithmic series distribution,which shows that there are more open species than the enriched species,and that the community evenness is relatively low.The diversity order of the family-genus-species in the community is:genus-species diversity>family-genus diversity>family-species diversity.
文摘The age structure and dynamics of dominant species Heptacodium miconioides at Tiantai Moduntain in Zhejiang Province were analyzed by adopting the method of "spatial series substituting for time series".The results indlicate that the age-class of the Heptacodium miconioides population is incomplete.The population’s survival curves are not linear,and its age structure is declining.The age structure for most of the other dominant populations is also declining,which indicates that the Heptacodium miconioides community is unstable.The species diversity of Heptacodium miconioides community consists in the fact that the woody plants are rich,and the species diversity index is higher than that of the herbs.In terms of species richness distribution,both the woody and herbs fix to the logrithmic scale distributions,which means that the number of the sparse species is bigger than the enriched species,and that the community’s evenness is relatively small.
