Plant Community Diversity of Daliangzi River National Forest Park in Heilongjiang Province

Traditional sampling method was used to investigate the species diversity of Abies nephrolepis-Pinus koraiensis forest and broadleaf mixed forest dominated by birch forest in Daliangzi River National Forest Park. The results showed that,there were 66 vascular plants in 8 sample plot,belonging to 56 genera and 34 families,in Abies nephrolepis-Pinus koraiensis forest. And there were 77 vascular plants in 6 sample plot,belonging to 62 genera and33 families,in broadleaf mixed forest. The vertical structure in two communities was tree layer,shrub layer and herbaceous layer. In terms of different communities in a same vegetation layer,even the species richness index of Abies nephrolepis-Pinus koraiensis forest was lower than that of broadleaf mixed forest,the species diversity index of the tree layer and shrub layer was not obvious between two communities. The species diversity difference of herbaceous layer was obvious,with higher species richness index,higher Simpson index,higher Shannon-Wiener index in broadleaf mixed forest and higher Pielou index in Abies nephrolepis-Pinus koraiensis forest. In terms of different layers in the same community,species richness index and Shannon-wiener index showed a tendency of herb layer tree layer shrub layer,with Simpson index of tree layer shrub layer herb layer,and Pielou index of shrub layer was greater than that of tree layer and herb layer,and the Pielou index of herb layer was slightly higher than that of tree layer in Abies nephrolepis-Pinus koraiensis forest,while that was the opposite in the broadleaf mixed forest.