SABER-ULA, Universidad de Los Andes - Mérida - Venezuela >
Facultades >
Facultad de Ciencias >
Unidades de Investigación de la Facultad de Ciencias >
Institutos de Investigación >
Instituto de Ciencias Ambientales y Ecológicas (ICAE) >
Articulos, Pre-prints (Instituto de Ciencias Ambientales y Ecológicas (ICAE)) >


Título: Interception of water by pastures of Pennisetum clandestinum Hochst. ex Chiov. and Melinis minutiflora Beauv
Autores: Ataroff Soler, Michele
Naranjo, María Elena
Correo Electrónico: ataroff@ula.ve
mnaranjo@ula.ve
Editor: Agricultural and Forest Meteorology 149: 1616-1620
Resumen: The conversion of montane cloud forests into pastures for grazing cattle is the main cause of important impacts on rivers and streams in most of the Andes. In order to evaluate the effects of vegetation changes we need to understand water fluxes, particularly canopy interception. We measured net precipitation responses by the canopies of Pennisetum clandestinum Hochst. ex Chiov. and Melinis minutiflora Beauv. under simulated rainfall. The samples were taken from grazed pastures during 1 year, digging out round mats of grass, placing them on wire-mesh devices after eliminating soil and underground biomass, and irrigating with different water amounts. The resulting data allow us to present a validated model for each species that predicts percentage of interception at different precipitation intensities taking into account previous canopy wetness within determined biomass ranges. We use these models to estimate 2 years of interception values for pastures of both species in the upper watershed of El Cañadón, Capaz River, Venezuelan Andes. Mean annual precipitation of El Cañadón is 1244 mm and the estimate of pasture interception was 36.5% and 31.8% for P. clandestinum and M. minutiflora, respectively. Interception models, such as the ones derived in this study, provide a basis for quantifying interception rates as a function of previous wetness of canopies and grass species.
Colación: 1616-1620
Fecha: Oct-2009
País: Venezuela
Palabras Claves: Interception
Pastures
Pennisetum clandestinum
Melinis minutiflora
Venezuelan Andes
Ecohydrology
Institución: Universidad de Los Andes
URI: http://www.saber.ula.ve/handle/123456789/39330
Aparece en colecciones:Articulos, Pre-prints (Facultad de Ciencias)
Articulos, Pre-prints (Instituto de Ciencias Ambientales y Ecológicas (ICAE))

Archivos en estos artículos:

Archivo Descripción TamañoFormato
Ataroff2009a.pdf128.25 kBAdobe PDFVer/Abrir

Todos los artículos en Dspace están protegidos con Derecho de Autor, todos los derechos reservados, a menos que se indique lo contrario.

 

Licencia Creative Commons
Todos los documentos publicados en este repositorio se distribuyen bajo una
Licencia Creative Commons Atribución-NoComercial-CompartirIgual 3.0 Venezuela.

Repositorio Institucional de la Universidad de Los Andes, Mérida, Venezuela - Comentarios
Software DSpace Copyright © 2002-2007 MIT and Hewlett-Packard -
DSpace Add-on Statistics of RepositóriUM © University of Minho.