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dc.contributor.advisorMartínez-Rodríguez, Gustavo A.
dc.contributor.authorOcasio-Rodríguez, Yamilis
dc.description.abstractThe nutrient state of the surface water is a very important issue. The objective of this study was to evaluate the nutrient state of the surface water of five rivers in the Río Grande de Arecibo Watershed and the impact of possible pollutants sources of total phosphorus (TP). Thirty three stations operated by the United States Geological Survey (USGS) were evaluated, 9 of them showed TP values over 0.1 mg/L, the suggested level to indicate pollution in rivers. Five small watersheds located in areas with high levels of TP were monitored for 6 months. Measured parameters were TP, total Kjeldahl nitrogen (TKN), dissolved reactive phosphorus (DRP), suspended sediments (SS), pH, conductivity, total coliforms (TC) and chlorophyll a (Chl-a). Using the water quality data, water discharge (Q) and the contributing area, TP export coefficients were calculated for each small watershed studied. The results showed mean concentrations of TP, DRP, TKN y TC higher in watersheds with animal production landuse and high percentage of urban landuse. Highly significant correlations between TP and SS and TC were observed, which suggested that the movement of these pollutants occurred by similar transport mechanisms. The concentration of TP correlated significantly with Q showing the relevance of non point sources on the watersheds studied. The export coefficients estimated were 1.84 and 1.45 kgTP/ha/yr exported for subbasins with animal production landuse, and 0.68, 0.70 and 0.28 kgTP/ha/yr for areas with small sections of urban landuse. Areas with high concentration of animals represent a significant P source to surrounding waters.en_US
dc.description.abstractEl estado nutricional de las aguas superficiales es un asunto de gran importancia. Este estudio tuvo como objetivo evaluar el estado nutricional de las aguas superficiales de cinco ríos en la cuenca del Río Grande de Arecibo y el impacto de posibles fuentes de contaminación con la cuantificación del exporte de fósforo total (TP). Se evaluaron 33 estaciones operadas por el Servicio Geológico de los Estados Unidos (USGS), de las cuales 9 presentaron valores de TP mayores de 0.1 mg/L, nivel sugerido para indicar contaminación en ríos. Se seleccionaron 5 microcuencas en las áreas con alto nivel de TP y se monitorearon durante 6 meses para TP, nitrógeno total Kjeldahl (TKN), fósforo reactivo disuelto (DRP), sedimentos suspendidos (SS), pH, conductividad, coliformes totales (TC) y clorofila a (Chl-a). Utilizando los datos de calidad de agua, descarga de agua (Q) y área contributiva, se calculó el coeficiente de exportación de TP de cada microcuenca. Los resultados muestran concentraciones promedio de TP, DRP, TKN y TC más altas en microcuencas con usos del terreno dedicados a la producción animal y con mayor porcentaje de área urbana. Las correlaciones significativas de TP con SS y TC infieren que el movimiento de estos contaminantes ocurre mediante mecanismos de transporte similares. La concentración de TP correlacionó significativamente con Q mostrando la relevancia de fuentes dispersas de contaminación con P en las microcuencas estudiadas. Se estimaron exportes de 1.84 y 1.45 kgTP/ha/año para áreas con producción animal, y 0.68, 0.70 y 0.28 kgTP/ha/año para áreas donde predomina la zona boscosa con pequeñas zonas sub-urbanas. Las zonas de mayor concentración de animales pueden ser grandes contribuyentes de P a los cuerpos de agua superficial.en_US
dc.subjectÁrea urbanaen_US
dc.subject.lcshRivers--Puerto Ricoen_US
dc.subject.lcshWatwesheds--Puerto Ricoen_US
dc.subject.lcshWater--Pollution--Puerto Rico.en_US
dc.titleEvaluación nutricional de cinco tributarios del Río Grande de Areciboen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(C) 2006 Yamilis Ocasio Rodríguezen_US
dc.contributor.committeeSotomayor-Ramírez, David
dc.contributor.committeePérez-Alegría, Luis R.
dc.contributor.representativeRodríguez Carías, Abner Sciencesen_US
dc.contributor.collegeCollege of Agricultural Sciencesen_US
dc.contributor.departmentDepartment of Crops and Agro-Environmental Sciencesen_US

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

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