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Studies On Plant Diversity In Mountain Areas In Beijing

Posted on:2006-06-06Degree:DoctorType:Dissertation
Country:ChinaCandidate:B ZhaoFull Text:PDF
GTID:1100360212957717Subject:Ecology
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This thesis focus on the research of floristic biodiversity from mountain area of Beijing, China, supported by the project Natural Scientific Foundation (Code 30170787), which is titled"Study on degree of forestry plants being in severe danger in main natural reserves in Beijing". And the same time, this research is closely related with other important biodiversity programs: e.g. Establishment of Beijing natural reserve system, mini-nature-reserve in natural beauty spot, working on plan and layout of biodiversity conservation. Thirteen natural reserves and beauty spots, Wuling Mountain Nature Reserve, Yunmeng Mountain Nature Reserve, Labagoumen Nature Reserve, Song Mountain Nature Reserve, Yunfeng Mountain Nature Reserve, Mutianyu Beauty Spot, Baihua Mountain Nature Reserve, Dongling Beauty Spot, Shidu Beauty Spot, Puwa Mountain Nature Reserve, Tanzhesi Beauty Spot, Miaofeng Beauty Spot, Shihua Cave Beauty Spot, has been included in this research.Based on the field investigation and data analysis, the main conclusions as following:1.the flora of the plants in Beijing mountains(1) There are 1282 species, belonging to 127 families and 537 genera (according to Engler's taxonomic system), has been recorded. There 1166 species are indigenous, belonging to 122 families and 503 genera, including Ferns, 62 species; Gymnosperm, 7 species; Dicotyledon, 862 species; Monocotyledon 234 species.New distribution record indicated from 5 species and 2 variations. New wild population record confirmed from 8 species, which has been considered as cultivated state. 4 species endemic to Beijing.(2) There are 4 families include more than 50 species, they are Compositae, Gramineae, Rosaceae, Leguminosae, less than 4% of total family number of Beijing, however, included species number amount to 29.5%. There are 44 families include 2-5 species, 33 families include 1 species, such as Ephedraceae, Phytolaccaceae. The family number amount to 63.12% of total family number in above two categories, but the included species number only accounts for 14.95% of total species number. It indicates that a few species has survived from Ice Age, for example, only Xanthoceras sorbifolia and Koelreuteria paniculta is survived in Sapindaceae, only Ailanthus altissima and Picrasma quassioides is bequeathed in Simaroubaceae. There are some families reached its distribution margin, maybe the explanation for only including a few species in Beijing, such as Menispermum dauricum and M. dauricum f. pilosum in Menispermaceae. Moreover, there are 7 families belonging to single species family or single genus family.(3) Based on the order data from first ten genera recorded between previous investigation and this research, there are some differences to some extent. For example, the order of ninth and tenth for genus Clematis and Astragalus recorded in...
Keywords/Search Tags:Beijing mountains, plant diversity, flora, vegetation, conservation
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