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| 1 | Effects of Topography and Land use on Woody Plant Species Composition and Beta Diversity in an Arid Trans-Himalayan Landscape, Nepal显示文摘Distribution patterns of plant species are believed to be impacted by small-scale habitat heterogeneity. However, there have been few comparative studies examining how woody vegetation composition and diversity varies with aspects of different orientations in the Trans-Himalayan region at a local scale. Here, we examined the effects of incoming solar radiation on variation in woody species composition and compared the diversity between the northeast- and southwest-facing slopes in a Trans-Himalayan valley of Nepal. We also examined the implicit interactions between slope orientation and land use in determining the compositional variations between the slopes. We selected two pairs of northeast- and southwest-facing slopes where the first pair has a similar land use and differs in exposure only(Pisang site) while the other pair has clear differences in land use in addition to slope exposure(Braka site). In each site, we sampled 72 plots(36 on each slope) in which the presence and absence of woody species, environmental variables, and disturbance were recorded. Correspondence Analysis(CA) results suggested that the woody species composition significantly varied between northeast- and southwest-facing slopes at both sites, and was significantly correlated with measured environmental variables such as radiation index, altitude, and canopy openness. In the Braka site,mean alpha diversity was significantly higher on southwest-facing slopes. In contrast, beta diversity and gamma diversity were greater on northeast-facing slopes at both sites. Our results suggest that topographic variables(e.g., radiation index) affect species composition between the slopes, likely due to their influence on small scale abiotic environmental variables. However, the effects of land use, such as livestock browsing/grazing may interact with the effects of slope exposure, effectively reducing differences in species composition within slopes but enhancing the differences in beta diversity between contrasting slopes in the Braka. We conclude that slope orientation and land use are important factors in structuring the woody species composition and diversity in the arid Trans-Himalayan region. We suggest that both environmental and land use variables should be taken into consideration in future studies on plant community structure along the cultural landscapes. | Shishir PAUDEL Ole R VETAAS | 2014 | Journal of Mountain Science2014，11，5： | 5 |
| 2 | Micro-site effects of trees and shrubs in dry savannas显示文摘 | | 1992 | Journal of Vegetation Science1992，3，： | 1 |
| 3 | Variation in plant species richness of different life forms along a subtropical elevation gradient in the Himalayas, east Nepa显示文摘 | Bhattarai K R Vetaas O R | 2003 | Global Ecol Biogeogr2003，12，4： | 1 |
| 4 | Variation in plant species richness of different life forms along a subtropical elevation gradient in the Himalayas, east Nepal显示文摘 | Bhattarai K R Vetaas O R | 2003 | Global Ecology and Biogeography2003，12，： | 1 |
| 5 | Relationship between biomass and plant species richness in arid-zone grazing lands 显示文摘 | Oba G Vetaas O R Stenseth N C | 2001 | Journal of Applied Ecology2001，38，4： | 1 |
| 6 | Species and altitude:a comparison between null models and interpolated plant species richness along the Himalaya altitude gradient,Nepal显示文摘 | Grytnes J A Vetaas O R | | 0，，03： | 1 |
| 7 | Species richness and altitude:a comparison between null model and interpolated plant species richness along the Himalayan altitudinal gradient,Nepal显示文摘 | GRYTNES J A VETAAS O R | 2002 | The American Naturalist2002，159，： | 1 |
| 8 | Fern species richness along a central Himalayan elevation gradient,Nepal显示文摘 | BHATTARAI K R VETAAS O R GRYTNES J A | 2004 | Journal of Biogeography2004，31，： | 1 |
| 9 | Realized and potential climate niches: a comparison of four Rhododendron tree species 显示文摘 | VETAAS O R | 2002 | Journal of Biogeography2002，29，4： | 1 |
| 10 | Relationship between biomass and plant species richness in aridzone grazing lands 显示文摘 | Oba G Vetaas O R Stenseth N C | 2001 | Journal of Applied Ecology2001，38，： | 1 |
| 11 | Distribution of vascular plant species richness and endemic richness along the Himalayan elevation gradient in Nepal显示文摘 | VETAAS O R GRYTNES J A | 2002 | Global Ecology & Biogeography2002，11，： | 1 |
| 12 | Variation in plant species richness of different life forms along a subtropical elevational gradient in the Himalayas,east Nepal显示文摘 | BHATTARAI K R VETAAS O R | 2003 | Global Ecology & Biogeography2003，12，： | 1 |
| 13 | Relationship between biomass and plant species richness in arid-zone grazing lands显示文摘 | Oba G Vetaas O R Stenseth N C | 2001 | Journal of Applied Ecology2001，38，： | 1 |
| 14 | The effect of canopy disturbance on species richness in a central Himalayan oak forest,Nepal显示文摘 | VETAAS O R | 1997 | Plant Ecology1997，132，： | 1 |
| 15 | Species Richness and Altitude: A Comparison between Null Models and Interpolated Plant Species Richness along the Himalayan Altitudinal Gradient, Nepal 显示文摘 | GRYTNES J A VETAAS O R | 2002 | American Naturalist2002，159，1： | 1 |
| 16 | Micro-site effects of trees and shrubs in dry savannas显示文摘 | Vetaas O R | 1992 | Journal of Vegetation Science1992，3，： | 1 |
| 17 | Relationships between biomass and plant species richness in arid zone grazing lands 显示文摘 | Vetaas R Stenseth N C | 2001 | Journal of Applied Ecology2001，38，： | 1 |
| 18 | Distribution of vascular plant species richness and endemic richness along the Himalayan elevation gra- dient in Nepal 显示文摘 | Vetaas O R Grytnes J A | 2002 | Global Ecology and Biogeography2002，11，4： | 1 |
| 19 | Can Rapoport's Rule Explain Tree Species Richness Along the Himalayan Elevation Gradient,Nepal显示文摘 | BHATTARAI K R VETAAS O R | 2006 | Diversity and Distributions2006，12，4： | 1 |
| 20 | Can Rapoports rule explain tree species richness along the Himalayan elevation gradient,Nepal显示文摘 | BHATTARAI K R VETAAS O R | 2006 | Diversity and Distribution2006，12，： | 1 |
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