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Details van artikel 121 van 185 gevonden artikelen
| Titel: |
Montane forest diversity influencing pioneer flora on natural landslides at the Western side of Podacarpus National Park, South Ecuador |
| Auteur: |
Pablo LOZANO C. Rainer W. BUSSMANN Manfred KÜPPERS |
| Verschenen in: |
Revista científica UDO agrícola |
| Paginering: | Jaargang 7 (2007) nr. 1 pagina's 142-159 |
| Jaar: |
2007 |
| Inhoud: |
The present study comprises a comparison of the biodiversity of montane forests and its influence on natural disturbances,especially landslides. A total of 412 plant species, belonging to 185 genera and 75 families were registered in naturalforests. A high endemism, with 58 endemic species, was found in the montane forest and paramo “ecotone” between 2600-2800 m, and around 3200m. Natural landslides were colonized by 218 species of 180 genera and 51 families. The mainspecies diversity was grouped around 2700 m. Five different soil profiles with a median depth of 60 cm were dug. Theycontained three main types: Dystropepts, reddish to yellowish soil with high kaolinitic and geothitic clay content, sometimeswith gibesite. Blackish soils, especially in humid, cold areas, of lighter color in humid areas of lower zones. Crayquets, richin organic matter, were encountered at altitudes from 3000 - 34000 m. The soils of landslides were very acidic, withmedium to very high nitrogen content, and median to low content of phosphorous and potassium. The TWINSPAN analysisof floristic affinity arranged the 170 landslide and 19 natural vegetation plots into three vegetation communities with 13landscape units. A CANOCO analysis indicated that community I was determined by a high content soil organic matter andcomprised undisturbed vegetation. Community II was delineated according to its soil acidity, exposition, and sandy-claysoils, and included mostly disturbed vegetation types at lower altitudes as well as two forest areas in Cajanuma (at 2500 m,wetern slopes) and Sabanilla (2800 m, estaren slopes). Community III was delineated by its clay soils and concentrated onthe western side of the research area, including the forests of San Francisco at 2100 m. Colonization on both sides of theAndean chain is patchy, with different forest types functioning as genetic reservoirs for colonization. At this point theinfluence of the soil seed banks has not been studied. |
| Uitgever: |
Universidad de Oriente Press (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 121 van 185 gevonden artikelen
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