The Plant Structure And Spatial Distribution Pattern Of Greater Khingan Range Forest

This paper uses the sample investigation method on the grid in Greater Khingan Range Baihe Forestry Bureau within the nature reserve is a wildlife forest undertook field research, research of the woodland of the main plant species distribution, distribution pattern, as well as the relationship between various plant species and environmental factor sorting between the graph analysis, analysis the results show that the plot of several plant species showed aggregated distribution state, wherein the larch, Pinus pumila aggregation degree is small, close to random distribution; while the other species such as alder and birch showed an obvious accumulation and distribution in different scales, and different degree of aggregation, which it in the research of4-8m scale aggregation degree the largest, birch plant populations in the research of0-15m scale is aggregation distribution state, while above15m scales and tend to be randomly distributed state; moreover the research of larch, Pinus pumila, diameter class structure of birch, larch diameter structure is well consistent with the" L" type, the forest of Larix in the growth stage of Pinus pumila; mainly concentrated in the moderate size grade, birch size class structure distribution is more complex, this large diameter level The number of moderate size, grade trees are also more concentrated. The paper also analyzed the sample in the upper layer of the dominant species spatial distribution pattern, analysis the results show that the plot of larch is a species with the largest number of tree species, its richness and important value of the largest, followed by the Siberian dwarf pine in the plot of the abundance of larger, individual relatively concentrated distribution, sample rare kind of less, only the coarse Liu skin, throughout the plot appears only two trees. Like the plants, small quantity proportion is larger; the species richness in the study of the plot does not have apparent change, species diversity with increasing altitude and increased and previous research results, especially well with previous moderate expansion hypothesis in sample the central plot species more categories, like in basically all species are distributed in the inner side.