| Choosing the plantations forest in natural forest, closing natural forest and the plantations forest of far away from the natural forest as the study object, employing the way of sample plot's surrey, studying and analyzing the spieces composition and diversity of plantation forest in three different region in Chunhua county, and compared with natural bush and grassland .Come to the following conclusions:(1)There were 87 species in the 27 sampling blocks in three investigation regions. They belong to 70 gengeras, 31 families. There were 14 species ,8 gengera of Chrysanthemums; 8 genera, 11 species of Leguminous;12 genera, 13 species of Rosaceae;9 genera, 9 species of Gramineae. The plants of these four families account for 52.8% of total gengeras and 54.0% of total species.(2)There were 19 species in Locust community and 17 species in Chinese pine Community in area of natural forest, in which there were 8 shrubs in two communities respectively. There were 16 species in Locust Community of area closing to natural forest, 8 of them were shrubs. Which were similar to the natural shrub community. The plantations of far away from the natural forest were lack of shrub, which indicted that the shrub community play major role in the process of restoration of plantations.(3)The plant of phanerophytes(meso-phanerophyta,micro-phanerophyta and mano-phanerophyta) and hemicryptophyte of plantation forest communities in the natural forest area and closing natural forest area were dominant. The phenomenon show the climatic characteristics of hot and much rain in summer, very cold and long in winter .The phenomenon also reflects the structure characteristics of plantation hierarchy. There had few species in plantation forest communities which is far away from the natural forest. And there had no dominant plant of life-form in plantation forest communities . The plant of micro-phanerophyta is dominant in shrub community of natural forest, hemicryptophyte take the second place. The hemicryptophyte is dominant in grassland community. (4)Species richness of plantations community in different regions show significant differences. The number of families, genera and species in forest plantations communities of natural forest and closing to nature forest were higher than the forest plantations communities far away from the natural forest. And the species richness of Locust community show higher than Chinese pinus community in same place. The difference between Locust community and Chinese pinus community were decided by characteristics and habitats of communities. The species richness of community of Locust and Chinese pine mixed higher than its pure. community.(5)Shannon-wiener index of species diversity and richness index of communities in natural forest area and closing to natural forest areas are higher than these communities far away from nature forest areas. Shannon-wiener index of and richness index of Locust Community was higher than Chinese pinus in three regions. Which note that Locust Community was favor to the invasion and Settlement of other species. Shannon-wiener index and species richness index of different levels of community show difference. Considering locust Community:herb layer >shrub layer > tree layer,Considering Chinese pinus Community: shrub layer > herb layer > tree layer. There was negative correlation between Simpson index and species richness index.(6) Similarity index between plantations communities in these three regions has a higher comparability. And there were discrepancy of Similarity index between the forest plantations community and the natural shrub community by different habitats .The same phenomena can be found between the forest plantations community and the grassland community. The results indicated that the common species were much more between two communities which had similar habitats. Conversely, the common species very few in different habitats.
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