Micro-site Conditions of Epiphytic Orchids in a Human Impact Gradient in Kathmandu Valley, Nepal
文献类型：期刊论文
| 作者 | Yagya Prasad ADHIKARI ; Anton FISCHER ; Hagen Siegfried FISCHER |
| 刊名 | Journal of Mountain Science
 |
| 出版日期 | 2012-06 |
| 卷号 | 9期号:3页码:331-342 |
| 关键词 | Human impact Host tree Micro-climate Epiphytic orchids Remote sensing Conservation Nepal |
| 通讯作者 | Yagya Prasad ADHIKARI |
| 英文摘要 | We studied distribution and site conditions of epiphytic orchids in a gradient of human interference in Kathmandu valley, central Nepal. The aim was to understand the recent distribution pattern of epiphytic orchids, with respect to (i) the micro-site conditions and (ii) the type and intensity of land use. The occurrence of epiphytic orchids was recorded for a grid with 1.5 km cell size. The cells represent different types and intensities of human impact. Site factors such as bark rugosity, bark pH, diameter at breast height (dbh; 1.3 m) of host trees, exposure to wind and sunlight intensity were recorded. With regard to the species richness and abundance of epiphytic orchids, we compared different human impact categories from very strong human impact (settlement area) to very low human impact (national park). Remote sensing was used for a supervised classification of land cover. Ficus religiosa turned out to be the most important host species for orchids in urban areas, while Schima wallichii and Alnus nepalensis significantly host orchids in the other categories. Both species richness and abundance of epiphytic orchids were significantly higher under very low human impact (forest in national park) and also some remaining patches of primary forest than the other regions. Micro-climate is crucial for orchid populations. Host bark pH, bark rugosity, sunlight intensity and host exposure were significantly different for all human impact categories in order to harbour epiphytic orchid species. Habitats with a mixture of mature trees are suitable and essential for the conservation of viable populations of epiphytic orchids in settled areas. The study reveals that to improve the population size of orchids it is essential for future urban forestry to: (i) Protect old trees as carriers of existing epiphytic orchid diversity, (ii) protect medium old trees to ensure that they may become old trees, (iii) plant new host trees for the future, (iv) plant in groups instead of single isolate trees. Trees should especially be planted in areas where orchids still exist to provide more trees for orchid population enlargement (e.g. along riparian system). Native species should be favoured; the pool of such native host species is wide. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-04-16 |
| 源URL | [http://192.168.143.20:8080/handle/131551/5102]  |
| 专题 | 成都山地灾害与环境研究所_Journal of Mountain Science _Journal of Mountain Science-2012_Vol9 No.3 |
| 推荐引用方式 GB/T 7714 | Yagya Prasad ADHIKARI,Anton FISCHER,Hagen Siegfried FISCHER. Micro-site Conditions of Epiphytic Orchids in a Human Impact Gradient in Kathmandu Valley, Nepal[J]. Journal of Mountain Science,2012,9(3):331-342. |
| APA | Yagya Prasad ADHIKARI,Anton FISCHER,&Hagen Siegfried FISCHER.(2012).Micro-site Conditions of Epiphytic Orchids in a Human Impact Gradient in Kathmandu Valley, Nepal.Journal of Mountain Science,9(3),331-342. |
| MLA | Yagya Prasad ADHIKARI,et al."Micro-site Conditions of Epiphytic Orchids in a Human Impact Gradient in Kathmandu Valley, Nepal".Journal of Mountain Science 9.3(2012):331-342. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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