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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
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Abstract


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.

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CLC: > Biological Sciences > Botany > Plant ecology and biogeography
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