Name:
Western Guianan Savanna & Shrubland Macrogroup
Reference:
NatureServe Biotics 2019
Description:
Savannas occurring on peneplains, hilly terrain and valleys, south of the upper and middle Orinoco River in Colombia and Venezuela. They grow both on Oxisols with ferruginous gravels, and in Colombia, on the westernmost transition zone between the western Guiana Shield and the Amazon, on ancient sandstone tablelands of 400 m elevation on average, like those of the Serrania de Chiribiquete and Araracuara and also where other sandstone horizontal strata outcrop. The climate is humid but seasonal. Dominants in the herbaceous layer are species of <i>Trachypogon</i> and <i>Axonopus</i>, and there is a more-or-less closed shrub layer 2-4 m high. In topographic depressions with a higher water table, dense shrublands up to 7 m tall can develop with presence of palms and an important biomass of epiphytes. Fires are the main drivers of the dynamics of these systems. Diagnostic species are <i>Trachypogon plumosus, Axonopus canescens, Andropogon</i> spp., <i>Aristida</i> spp., <i>Thrasya petrosa, Bulbostylis</i> spp., <i>Scleria cyperina, Galactia, Chamaecrista, Eriosema, Krameria ixine, Curatella americana, Byrsonima crassifolia, Byrsonima coccolobifolia, Palicourea rigida, Roupala montana, Acrocomia aculeata</i>. Variants: <i>Attalea</i> sp., <i>Caraipa llanorum, Bowdichia virgilioides, Platycarpum orinocense, Casearia javitensis, Psidium salutare, Protium heptaphyllum</i>, and also members of the Xyridaceae and Rapataceae.
Accession Code:
urn:lsid:vegbank.org:commConcept:40926-{A4C0F11C-85B2-477F-B1E9-8C75062BBCEE}
Plot-observations of this Community Concept:
0
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