Study On The Structure Of Phyllostachys Heterocycla Mixed Forest And Selection Of Associated Tree Species For Phyllostachys Heterocycla

According to the information of community ecology, 120 plots in the natural or half-natural Phyllostachys heterocy mixed forests were divided into four groups of site type which were respectively named I site type, II site type. III site type and IV site type in Tian Baoyang Natural Reserve in Fujian, by using principle analysis and dynamic cluster. Main site factors in different groups of site type existed obvious difference, for instance the altitude, the thickness of humus layer and the slope.The structure of the arbor layer in Phyllostachys heterocycla mixed forests was studied by using important value and species diversity in different groups of site type. The results showed that the structure of the arbor layer in different groups of site type had quite obvious difference; the community species diversity, community evenness and ecological dominance were different; many species coexisted better on shade slope than sunny slope and in lower mountain than middle mountain; Phyllostachys heterocycla grew better in lower mountain than middle mountain.The optimal associated tree was selected by means of Fuzzy Cluster based ecological species group's theory. The research indicated that Castanopsis fargesii, Alniphyllum fortunei and Liquidambar formosana were selected for I site type; Schima superba was selected for II site type; Castanopsis fargesii, Alniphyllum fortunei, Liquidambar formosana, Schima superba and Myricaca rubra were selected for HI site type; Liquidambar formosana and Schima superba were selected for IV site type. In a word, the optimal associated tree commonly possesses several characteristics: (1) its adaptability is strong so that the optimal associated tree is able to vegetate on the common conditions; (2)its mightiness root system can protect waterhead and conserve soil and water; (3) tall and straight tree which stands the superstratum of the mixed forest is propitious to enhance Phyllostachys heterocycla's capbility which withstands the pressure of snow and the gravity of ice; (4) the rhizobium tree or hardwood is propitious to increase the fertility of the soil; (5) the optimal associated tree has strong resistence and hasn't the same plant diseases and insect pests with Phyllostachys heterocycla.There was positive correlation between muli-niche breadth niche and multi-niche overlap on a certain degree between Phyllostachys heterocycla and its associated tree in themixed forest. Associated tree had rather broad muli-niche breadth niche and then its multi-niche overlap had rather big. Phyllostachys heterocycla associated tree which held rather broad muli-niche breadth was fitted for being planted with Phyllostachys heterocycla on the different site types, for example Castanopsis fargesii and Schima superba. Phyllostachys heterocycla's associated tree which held rather narrow broad muli-niche breadth was fitted for being planted with Phyllostachys heterocycla on the special site type, for example Myricaca rubra.Associated tree's different competition and Phyllostachys heterocycld's biological characteristic brought disremarktable association as a whole in different groups of site type and association between two associated tree exists rather feebleness positive or negative association. Phyllostachys heterocycla and the optimal associated tree which was selected by means of Fuzzy Cluster existed remarkable association.The spatial distribution patterns of Phyllostachys heterocycla and its associated tree's were different. The spatial distribution patterns of Phyllostachys heterocycla were an aggregated pattern. The main spatial distribution patterns of the different age's Phyllostachys heterocycla were an aggregated pattern. The main spatial distribution patterns of associated tree were random distribution. The spatial distribution patterns of these species lay multi-factor. Synthetized and analyzed the spatial distribution patterns in the Phyllostachys heterocycla mixed forests, Phyllostachys heterocycla associated tree should be planted by random distribution during constructing th...