Two possible factors are the decrease in intensity of competition with altitude and decline in the species pools. The more details are described in https://www.researchgate.net/publication/227495206_Effects_of_altitude_and_topography_on_species_richness_of_vascular_plants_bryophytes_and_lichens_in_alpine_communities
Article Effects of altitude and topography on species richness of va...
Hi Birjit,
Please follow these links and pdf attachment.
http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2745.1998.00325.x/full
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4391938/
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0122905
Best of Luck
Dear Birjit,
Here is another reference for you.
http://aob.oxfordjournals.org/content/94/2/199.full
I believe that a gradient of elevation or altitude is equivalent to a latitudinal gradient. In phytogeographical terms, a tropical species must have its density decreases as you move away from the equator to higher latitudes. The same should happen in relation to altitude.
Dear Singh
Greetings
No doubt altitude has considerbale influence on vegetation growth
Based on your query I would like to know what is the length of the transect?
Further, is it gradual increase in altitude or sudden increase in altitude?
In simple the availability of moisture, prevelance of temperature, wind etc are going to be influenced by the altitude.
Its 3km transect and for every 1 km interval a hectare plot has been laid for biodiversity and forest study.And it is gradual increase in altitude.
Dear Singh,
Attached publication seems to contain patterns relevant to your question.
Greetings, Armin Seydack
Hello. There are patterns of negative association among altitude, composition and structure from, especially in tropical forests. I send link some papers with information about it in tropical forests. Regards.
https://www.researchgate.net/publication/201983354_Tree_Diversity_Forest_Structure_and_Productivity_along_Altitudinal_and_Topographical_Gradients_in_a_Species-Rich_Ecuadorian_Montane_Rain_Forest
https://www.researchgate.net/publication/260115634_Spatial_patterns_of_above-ground_structure_biomass_and_composition_in_a_network_of_six_Andean_elevation_transects
https://www.researchgate.net/publication/227748363_What_Factors_Affect_Diversity_and_Species_Composition_of_Endangered_Tumbesian_Dry_Forests_in_Southern_Ecuador
https://www.researchgate.net/publication/303929433_Elevation_and_topography_influence_community_structure_biomass_and_host_tree_interactions_of_lianas_in_tropical_montane_forests_of_southern_Ecuador
https://www.researchgate.net/publication/235418183_Vegetation_response_along_edge-to-interior_gradients_in_a_high_altitude_tropical_forest_in_peninsular_India
https://www.researchgate.net/publication/285994579_Changes_in_floristic_composition_community_structure_and_species_diversity_across_a_tropical_coniferousbroadleaved_forest_ecotone
https://www.researchgate.net/publication/291342005_Community_structure_and_species_density_in_tropical_forest_associations_in_Guanacaste_Province_Costa_Rica
https://www.researchgate.net/publication/264093901_Climate_and_soil_attributes_determine_plant_species_turnover_in_global_drylands
Article Tree Diversity, Forest Structure and Productivity along Alti...
Article What Factors Affect Diversity and Species Composition of End...
Article Vegetation response along edge-to-interior gradients in a hi...
Article Spatial patterns of above-ground structure, biomass and comp...
Article Climate and soil attributes determine plant species turnover...
Article Changes in Floristic Composition, Community Structure and Sp...
Data Community structure and species density in tropical forest a...
Article Elevation and topography influence community structure, biom...
dear Armin Seydack , I see it't been quite a while a go, but if you could recommend for the following (just according to your researches): I am trying to analyse the long-term spatial changes of specific LULC types (silvopasture), and I would like to include elevation as one of the factors. since the research includes the area of the whole county, with the elevation range 45-1582 m, I'm thinking of how to break this range into intervals and see if the stability of these areas is also influence by this height. Would you have any opnion or have some articles that you might also recommend on which intervals it makes more sense to consider? thank you in advance. (location-central Europe)
Indeed, elevation regulates several abiotic factors that control the observed vegetation patterns and the ecology of mountain forests. Climatic variables such as temperature or atmospheric pressure decrease with increasing elevation while radiation under cloudless sky and fraction of UV-B radiation at any given total solar radiation increase
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