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Species Diversities of Major Communities in Liupanshan Mountain

Author: LiXiaoJie
Tutor: WangGang；YuanJianLi
School: Lanzhou University
Course: Ecology
Keywords: Liupan Forest communities Species diversity
CLC: S718.5
Type: Master's thesis
Year: 2007
Downloads: 241
Quote: 1
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Abstract


Liupanshan southern forest steppe zone is located in the temperate grass area, vegetation type temperate coniferous forest and deciduous broadleaf forest. The liberation of the Liupanshan the vegetation has been severely damaged, the early 1970s, the forest areas began large-scale movement of afforestation tree species mainly in North China larch, Chinese pine and Qinghai spruce. Survey of existing vegetation, carry out the Liupanshan ecosystem degradation mechanism to accelerate the ecological restoration and reconstruction of the area have an important role in guiding. Therefore, to investigate the Liupanshan vegetation, the biodiversity of the area, trying to provide some scientific basis for the restoration and reconstruction of the ecosystem in the area, biodiversity conservation and sustainable use. Quantitative Classification and still is the study of vegetation pattern, the relationship between vegetation and environment. Therefore, this article Liupanshan forest community distribution pattern of the relationship between the environment, sort results show that: (1) the first axis basically reflect changes in the plant community aspect, that DCA first axis of DCA From left to right, aspect of the more sunny as hot and dry; second axis is substantially reflect the elevation gradient, ie DCA second axis from bottom to top, the altitude gradually reduced; ② kinds Sort figure shows that in communities. The great similarity in the distribution pattern of the distribution pattern of the dominant species and plant community types, the distribution pattern of the dominant species in plant communities largely determine the distribution pattern of the plant community types. Tree layer affect the growth of understory vegetation and different degrees of change the understory habitat will happen when the tree layer changes, causing changes understory plant species composition and quantitative characteristics. The distribution of species diversity is not only related to its own characteristics and species, and is closely related to environmental factors and biological factors. In this paper, gray correlation analysis to study the impact of environmental factors Liupan Species Diversity. The gray relational analysis based on gray system gray process does not require too many samples and typical probability distribution law, the basic idea is based on the degree of similarity of the sequence curve geometry to determine whether close contact. The results show that environmental factors, soil moisture, and the diversity of the highest correlation. Closely related to soil moisture and community structure, while precipitation is the main source of plant root distribution within the soil moisture, precipitation and community structure has significant association. For soil nutrients, total nitrogen and diversity associated with the highest; Armand pine is the dominant species in the forest soil fertility highest in soil fertility evaluation of major forest types of the forest area, North China larch Quercus liaotungensis mixed Liaodong oak clock less linden mixed forests and North China larch the Pinus tabulaeformis spruce mixed forest in the middle larch and pine poorer, North China larch Mixed Forest worst. The biomes structure between plants and plant communities, the relationship between the plants and the environment visible marks, and is also the basis of community of other features. Generally speaking, the Liupanshan forest communities in the trees, shrubs and herbaceous layer diversity order herbaceous layer> shrub layer> tree layer, the Loess Plateau in northern regions diversity herb layer> shrub layer> tree layer (Yueming , 1998) Conclusion consistent. The β diversity indices reflect the differences in species composition between different communities, habitat diversity can be used to compare different locations, the α diversity together constitute the overall community or ecosystem diversity or a lot of biological heterogeneity. Β diversity indices were calculated between the community, the results showed that the North China larch Liaodong oak mixed forest phase anisotropy coefficient minimum phase anisotropy coefficient, larch and other forest communities and other forest communities. Community relative anisotropy coefficient is smaller, its main reasons: First, they are in relatively close succession stages; Second, they have similar constructive species constructive species of forest communities decide shrubs and herbaceous species composition.

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CLC: > Agricultural Sciences > Forestry > Forestry basic science > Forest Biology > Forest Ecology
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