The Succession And Characteristic Of Vegetation Community Research In Zuojia Nature Reserve

In china, the research of succession of ecological communities started early in time. From 1970's many scholar have researched the succession of Broad-leaved and Pinus koraiensis mixed forest communities. The main emphasis of our scholar research is succession of Broad-leaved and Pinus koraiensis mixed forest communities. In early time there is Broad-leaved and Pinus koraiensis mixed forest in Zuojia nature reserve. Through closing of hillsides to facilitate afforestation before forest destroy by people, now the vegetation is secondary forest of Broad-leaved and Pinus koraiensis mixed forest in the reserve. In this article we use qualitative and quantitative to research the succession of secondary forest in these reserve.The process of vegetation secondary succession in Zuojia nature reserve is disturbed and destroyed by people. It is a retrogressive succession process. People fell the Pinus koraiensis in primary vegetation. So the community is changed to Shaw. The disturbed of people change the conditions of community. The positive tree is account for dominance, the community change to mongolian oak and Betula davurica mixed forest. Man fells the tree, then the community change to forbs then the community change to shrub when people fell the shrub. When people don't need the land reclamation the community change to Artemisia scoparia and Setaria viridis mixed community. The phase of succession is Shaw,mongolian oak and Betula davurica mixed forest,mongolian oak,Corylus heterophylla shrub,Artemisia scoparia and Setaria viridis mixed community. In the process of succession the perennial herbage change to annual herbage, negative plant change to positive plant. The herbage in Shaw mainly is negative plant. In other community is positive plant. The annual herbage mainly is in Artemisia scoparia and Setaria viridis mixed community. The mainly shrub in Shaw is the negative shrub example of Acanthopanax senticosus,Philadelphus schrenkii and 0stryopsis davldiana. The mainly shrub in the mongolian oak and Betula davurica mixed forest,mongolian oak and Corylus heterophylla shrub is the positive shrub Corylus heterophylla. The mainly tree in Shaw is the negative tree example of Tilia mandshurica,Acer mono and Phellodendron amurense. In mongolian oak and Betula davurica mixed forest is mongolian oak and Betula davurica. In mongolian oak is the positive tree mongolian oak.In the process of vegetation secondary succession from Shaw to Artemisia scoparia and Setaria viridis mixed community, the niche width of negative shrub Philadelphus schrenkii and 0stryopsis davldiana constantly decrease, Lonicera spconstantly decreased too. The niche width of positive shrub constantly increase, the niche width of the negative tree Tilia mandshurica and Phellodendron amurense constantly decrease, the positive tree mongolian oak constantly increase.The depth of litter,watery rate,organic matter and whole nitrogen constantly decrease.Diversity index of communities: forb>Shaw>mongolian oak and Betula davurica mixed forest>mongolian oak>shrub>Artemisia scoparia and Setaria viridis. Homogeneity index have regular correlation with diversity index. Dominance index have negative correlation with diversity index. Marlalef index of communities: Shaw>Mongolian oak and Betula davurica mixed forest>mongolian oak>shrub>forb> Artemisia scoparia and Setaria viridis. This reflects the species quantity is decreased In the process of vegetation secondary succession.The similarity index of shrub is high in community of mongolian oak and mongolian oak and Betula davurica mixed forest.