Resumo

VERGARA VARELA, Hernando. Vegetation patterns and land use types in the Patia valley. Colomb. for. [online]. 2015, vol.18, n.1, pp.25-45. ISSN 0120-0739.  https://doi.org/10.14483/udistrital.jour.colomb.for.2015.1.a02.

Vegetation of dry forest ecosystem of the Patia valley located in the department of Cauca has been altered and replaced by crops and pastures. The forest remnants were characterized in terms of their structure and floristic composition at altitudes between 500 and 800 m. This study evaluated changes in land cover using aerial photographs and satellite image as input to produce land cover maps in order to assess changes associated with land use types. Data were analyzed by multivariate methods using the TWINSPAN program to produce a vegetation classification, identifying six vegetation structure types and six floristic types. The floristic gradient thrown by the program describes structural types, ranging from forests to shrublands and grasslands. Successional plant communities reflect conditions of the fragments, Citharexylum kunthianum community contrasts with riparian forests determined by Eugenia sp the dominant specie in disturbed areas. Handroanthus chrysanthus community shows a transition to xerophyte vegetation of the south of Colombia. Land use types and land cover classes have remained since 1961, increasing pasture cover. Tropical dry forests are reduced in its structure, considering that forests are disturbed. In the long history of the land use and disturbance of this area, a reduction in forest fragments is evident, social and economic factors are a force for a change in plant communities in rural areas.

Palavras-chave : dry tropical forest; cover change; vegetation cover; Colombia; plant communities; Patía; land use.

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