Dissertation > Excellent graduate degree dissertation topics show

The Study on Species Diversity and Dominant Populations Niche of Gymnocarpos Przewalskii Maxim. Community in Hami Basin

Author: LuYan
Tutor: LvGuangHui
School: Xinjiang University
Course: Ecology
Keywords: Bare , fruits, Species diversity Niche Soil factors Protection measures
CLC: Q948
Type: Master's thesis
Year: 2007
Downloads: 206
Quote: 3
Read: Download Dissertation


The community to bare fruit for the study, and bare fruit tree species diversity and its dominant populations niche. Bare, fruits, conservation biology, and bare fruit trees are endangered, protection measures. The study area is located the Hami near Sandaoling, is a desert ecosystem. On behalf of the plant shrub species bare, fruits, (Gymnocarpos przewalskii Maxim) the Overlord (sarcozygium xanthoxylon Bunge.), Wood smartweed (Atraphaxis furtescens Ewersm.), Pipa Chai (Reaumuria, soongorica Maxim), Haloxylon (Haloxylon ammodendron the the Bunge), film If ephedra (Ephedra przewalskii Stapf.), Salsola (Salsola arbuscula Pall.) Herb stone raw camel foot valve (Zygophyllum rosovii Bunge.), Salt grass (Halogeton glomeratus Mey.), Alhagi sparsifolia (Alhagi sparsifolia Shap.) And so on. In the the 39 quadrats survey, a total of 13 species belonging to the bare fruits, Section (Paronychiaceae) the Zygophyllaceae (Zygophyllaceae) Chenopodiaceae (Chenopodiaceae), the Tamarix Branch (Tamaricaceae,), Polygonum (Polygonaceae), ephedra (Ephedraceae), Solanaceae family (Solanaceae), Fabaceae (Leguminosae). This paper systematically bare, fruits, Species diversity of desert ecosystems research results show that, compared with temperate species diversity of vegetation types, bare, fruits, Species diversity is generally lower, mainly due to the local drought eco-geographical environment. The area bare, fruits, communities Shannon-Wiener diversity index in the range of 0.6876 to 1.5837, below the desert steppe (1.8604-3.4142), higher than the sand (0.029-0.696), indicating that the level of species diversity phase with the local ecological environment Adaptation of the results. Linear regression analysis, the results showed that soil pH has a significant effect on species diversity of species diversity and soil indicators. Soil organic matter and nutrient complex of species diversity mechanism, the role of the uncertain direction. Bare fruits, community niche of the dominant species were analyzed, and results show that the niche breadth bare, fruits, and Overlord on the soil pH, salt content and organic matter in three-dimensional niche overlap (0.9451,0.9704,0.9788 ), indicating that the two dominant species have similar characteristics to adapt to the soil pH, salinity and organic matter. These two plant species and other species niche overlap generally is relatively large, the niche breadth of the larger species and other species niche overlap is also larger. The main plant species in the study area on the niche proportional similarity between 0-0.5765 the niche similarity ratio of 0.3 or less accounted for 81.0%, niche similarity is quite low, indicating that significant niche differentiation desert vegetation. Bare, fruits, endangered, that the bare fruits, endangered as a result of the combined effects of the intrinsic the endangered factor and external adverse environmental. Where human activities are the dominant factors exacerbate bare, fruits, endangered. Not only directly on the bare, fruits, causing devastating damage, but also indirectly caused by the destruction of their habitat bare, fruits, endangered and extinct. Therefore, bare, fruits, habitat protection and the protection of its own equally important. For these reasons, it is recommended that the use of protective measures: in situ conservation, ex situ conservation, in vitro conservation, naturalization natural, conscientiously implement the regulations, public education.

Related Dissertations

  1. The Role of Media in the Rural Daily Life,D422.7
  2. Analysis of Attributes of Quality and Soil Factors on Style of Fen-flavor Flue-cured Tobacco in Qujing District,S572
  3. Study on Vascular Plant Diversity and Their Dispersal Mechanisms on the Vertical Surfaces of nanjing Ming Dynasty City Wall,Q948.1
  4. Study on Quantitative Ecology of Gleditsia Heterophylla Communities in the Southern Tip of Taihang Mountains, Shanxi,Q948
  5. Community Ecology and Scientific Management of Lawn Weeds Communities in Taiyuan,S451
  6. Study on Quantitative Ecology of Quercus Acutissima Communities in Zhongtiao Mountains, Shanxi,Q948
  7. Study on the Ecological Characteristics of Caragana Communities in Shanxi, Shaanxi, Ningxia and Inner Mongolia,Q948
  8. Quantitative Monitoring and Evaluation of the Vegetation Degradation of Coal Mining Area,Q948
  9. Quantitative Ecology and Management Policy of Weeds Communities in Shanxi Orchard,S451
  10. The Impact of Tourism on Typical Vegetation in Luya Mountain Nature Reserve, Shanxi Province,S759.9
  11. Study on Evaluation of Stand Species Diversity in Nanping,S718.5
  12. Effects of Fertilization on Vegetation and Soil of Degraded Grassland on Northern Tibetan Plateau,S812
  13. miR-16 Enhances Bone Marrow Derived Mesenchymal Stem Cells Differentiation Towards Cardiac Phenotypes in Cardiac Niche in Vitro.,R54
  14. Research on Community Structure and Host Selection of Chigger Mites in 19 Counties of Yunnan Province, China,R384.4
  15. Protection of trade secrets were studied,D922.294
  16. Case Studies of Technological Protection Measures for Computer Software Copyright,D923.41
  17. The Study of Gramineae in Karakorum Mountains of China,Q948
  18. The Study of Compositae Plant in the Karakorum Mountains of China,Q948
  19. Analysis and Evaluation on Vegetation and Species Diversity of the Proposed Taining-Jianning Highway in Fujian,Q948
  20. The Design and Building in Digital Platform for Species Diversity of Seed Plants in Hunan,Q948
  21. Research on the Production Scheduling Model for Paper-making Enterprises Based on Theory of Constraints,F426.83;F224

CLC: > Biological Sciences > Botany > Plant ecology and biogeography
© 2012 www.DissertationTopic.Net  Mobile