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dc.contributor.advisorChinea-Rivera, Jesús D.
dc.contributor.authorQuintero-Nazario, Braulio A
dc.date.accessioned2018-05-16T16:11:46Z
dc.date.available2018-05-16T16:11:46Z
dc.date.issued2007
dc.identifier.urihttps://hdl.handle.net/20.500.11801/571
dc.description.abstractSpecies composition and forest structure were described for abandoned farmlands in the Añasco River Watershed. Prior to abandonment, coffee was cultivated on the slopes surrounding the valley while sugar cane and coconut palms were cultivated in the valley. Plots were randomly chosen from an age class map produced from aerial images taken in 1936, 1963, 1994, 2001 and vegetation data collected in 1978. Vegetation was sampled in 500 m2 circular plots, individuals with diameter at breast height (dbh) greater than 2.5 cm were measured and identified. Structural characteristics were calculated from the data collected in the field. Communities on abandoned coffee plantations and palm plantation were clearly identified, but not for abandoned sugar plantations. There were a total of sixty-nine species identified and six unknown species. Results from the ordination technique determined that age since abandonment was the highest correlated variable to species composition. No significant differences were determined in structural characteristics between plot of the same age on the valley and on the mountains, except for tree density. Species composition at the abandoned coffee plantations resembles the composition of species at the Luquillo Experimental Forest and Central Cordillera Forest of Puerto Rico. Forest structure for some plots on the Añasco River Watershed reached levels comparable to that of mature forests after 80 years of vegetation succession.en_US
dc.description.abstractLa composición de especie y la estructura del bosque fueron descritas para las fincas abandonadas en la cuenca de drenaje del Río Añasco. Se cultivaba café en las laderas que rodean el valle, mientras en el valle se cultivaba caña de azúcar y palma de coco. Las parcelas fueron escogidas al azar de mapas de clase de edades producido con ayuda de imágenes aéreas de 1936, 1963, 1994, 2001 y datos de vegetación de 1978. Se muestreo la vegetación en parcelas circulares de 500 m2, los individuos con 2.5 cm o más de diámetro a altura del pecho fueron medidos e identificados. Se calcularon las características estructurales de los datos tomados en el campo. Se pudieron identificar comunidades en fincas abandonadas de café y palma, pero no para fincas abandonadas de caña. Se identificaron un total de sesenta y nueve especies y hubo seis desconocidos. Los resultados de la técnica de ordenación determinaron que tiempo de abandono fue la variable más altamente correlacionada a la composición de especie. No se detectaron diferencias significativas en características estructurales entre parcelas de la misma edad en el valle y las montañas. La composición de especie de las fincas abandonadas de café se semeja a la composición de especie del Bosque Experimental de Luquillo y de la Cordillera Central de Puerto Rico. La estructura del bosque para algunas parcelas en la cuenca del Río de Añasco llegó a niveles comparables con bosque maduro bajo 80 años de sucesión.en_US
dc.language.isoenen_US
dc.subjectAbandoned farmlands in the Añasco River Watersheden_US
dc.subjectSpecies compositionen_US
dc.subject.lcshRestoration ecology--Puerto Rico--Añasco River.en_US
dc.subject.lcshAbandoned farms--Puerto Rico--Añasco River.en_US
dc.subject.lcshAñasco River (P.R.)en_US
dc.subject.lcshWatershed restoration--Puerto Rico--Añasco River.en_US
dc.titleForest recovery on abandoned farms of the Añasco River Watershed of western Puerto Ricoen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2007 Braulio A Quintero-Nazarioen_US
dc.contributor.committeeSantos, Carlos J.
dc.contributor.committeeBreckon, Gary J.
dc.contributor.committeeKolterman, Duane A.
dc.contributor.representativeVan Bloem, Skip
thesis.degree.levelM.S.en_US
thesis.degree.disciplineBiologyen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Biologyen_US
dc.description.graduationYear2007en_US


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    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a degree at UPR-Mayagüez.

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