| Vertical patterns of the flora of seed plants in Dawei Mountain in Yunnan Province, Southwest China |
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| 作者姓名： | Wang Juan Ma Qin-yan Du Fan Yang Yu-ming |
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| 作者单位： | Wang Juan1* Ma Qin-yan2 Du Fan1 Yang Yu-ming1 1Biodiversity and Nature Conservation Center of Southwest Forestry College，Kunming 650224，P. R. China 2School of Resources and Environment，Beijing Forestry University，Beijing 100083，P. R. China |
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| 基金项目： | Acknowledgement This study was supported by the National Key Basic Program of China （No. 2003CB415100） |
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| 摘 要： | Vertical gradients incorporate multiple resources gradients which vary continuously. Therefore, research on mountain flo-ristic patterns along vertical gradients is important to reveal regular patterns of the flora along environmental gradients and to under-stand the changes in biodiversity along these gradients and their biological fitness. This study was designed to explore the character-istics of the floral compositions and ecological significance of floristic patterns along the vertical gradients of the National Nature Reserve of Dawei Mountain, located in the southeast of Yunnan Province. We analyzed the structural characteristics of the flora and the distribution patterns of its floristic components as a function of elevation on the basis of our field investigations along vertical vegetation transects. We carried out a systematic cluster analysis in order to determine the dividing line of floristic changes by eleva-tion along gradients and studied the effects of mountain climate on the vertical variation of floristic composition. The study shows: 1) that the obvious boundary, which differentiates tropical distribution, is located at an elevation of approximately 1,500 m, which separates the tropical rain forests from the evergreen broad-leaved forests; 2) that humid rain forests are found below 700 m elevation, mountain rain forests between 700 and 1,500 m, monsoon evergreen broad-leaved forests between 1,300 and 1,800 m and mountain mossy evergreen broad-leaved forests above 1,800 m. Non-representative mountain mossy dwarf forests (above 2,100 m) in the area are found on the windward sides and barren lands on mountain slopes; 3) that Hopea mollissima is one of the major component species of mountain rain forests, but it should not be considered as the major indicator species in humid rain forests as is generally accepted.
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| 关 键 词： | 大卫山 地理学原理 花神 丛生分析 高山植物种类 森林 |
| 收稿时间： | 16 December 2006 |
| 修稿时间： | 2006-12-16 |
Vertical patterns of the flora of seed plants in Dawei Mountain in Yunnan Province,Southwest China |
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| Wang Juan Ma Qin-yan Du Fan Yang Yu-ming.Vertical patterns of the flora of seed plants in Dawei Mountain in Yunnan Province, Southwest China[J].Forestry Studies in China,2007,9(3):169-176. |
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| Authors: | Wang Juan Ma Qin-yan Du Fan Yang Yu-ming |
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| Institution: | 1. Biodiversity and Nature Conservation Center of Southwest Forestry College, Kunming 650224, P. R. China
2. School of Resources and Environment, Beijing Forestry University, Beijing 100083, P. R. China |
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| Abstract: | Vertical gradients incorporate multiple resources gradients which vary continuously. Therefore, research on mountain flo-ristic patterns along vertical gradients is important to reveal regular patterns of the flora along environmental gradients and to under-stand the changes in biodiversity along these gradients and their biological fitness. This study was designed to explore the character-istics of the floral compositions and ecological significance of floristic patterns along the vertical gradients of the National Nature Reserve of Dawei Mountain, located in the southeast of Yunnan Province. We analyzed the structural characteristics of the flora and the distribution patterns of its floristic components as a function of elevation on the basis of our field investigations along vertical vegetation transects. We carried out a systematic cluster analysis in order to determine the dividing line of floristic changes by eleva-tion along gradients and studied the effects of mountain climate on the vertical variation of floristic composition. The study shows: 1) that the obvious boundary, which differentiates tropical distribution, is located at an elevation of approximately 1,500 m, which separates the tropical rain forests from the evergreen broad-leaved forests; 2) that humid rain forests are found below 700 m elevation, mountain rain forests between 700 and 1,500 m, monsoon evergreen broad-leaved forests between 1,300 and 1,800 m and mountain mossy evergreen broad-leaved forests above 1,800 m. Non-representative mountain mossy dwarf forests (above 2,100 m) in the area are found on the windward sides and barren lands on mountain slopes; 3) that Hopea mollissima is one of the major component species of mountain rain forests, but it should not be considered as the major indicator species in humid rain forests as is generally accepted. |
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| Keywords: | Dawei Mountain geographical elements vertical gradient cluster analysis |
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