Unidades de Investigación de la Facultad de Ciencias: Envíos recientes
Mostrando ítems 161-180 de 1112
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Sensitivity of soil restoration indicators during paramo succession in the high tropical Andes: chronosequence and permanent plot approaches
(Restoration Ecology 17(5): 619-628, Venezuela, 2009-09)The aim of this study was to analyze indicators of soil restoration during secondary succession in a heterogeneous valley in the high tropical Andes. A combination of chronosequence and permanent plot methods was used to ... -
Modeling organic transformations by microorganisms of soils in six contrasting ecosystems: Validation of the MOMOS model
(Global Biogeochemical Cycles 24, GB1008,doi:10.1029/2009GB003527, Venezuela, 2010-02-26)The Modeling Organic Transformations by Microorganisms of Soils (MOMOS) model simulates the growth, respiration, and mortality of soil microorganisms as main drivers of the mineralization and humification processes of ... -
Características físicas y ambientales del Ramal de Calderas
(Rial, A., Señaris, J., Lasso, C. Flores, A. (Eds). Evaluación rápida de la biodiversidad y aspectos socioecosistémicos del ramal de Calderas, Andes de Venezuela. Capítulo 1. RAP Bulletin of Biological Assessment 56. Conservation International, Arlington, VA. USA. pp. 45-49, Estados Unidos, 2010)El Ramal de Calderas está ubicado en la porción nororiental de la cordillera de Mérida, sobre su vertiente llanera, en el Estado Barinas, Andes de Venezuela. Esta región está formada por una sucesión de afloramientos ... -
Spatial heterogeneity, land use and conservation in the cerrado region of Brazil
(2006)Aim This paper presents a spatial classification of the environmental and ecological diversity of the cerrado region of Brazil, as well as an appraisal of the levels of conversion to agriculture and of the extent of land ... -
O caso das savanas tropicais da América do Sul: quando a sustentabilidade econômica e ecológica não é suficiente
(2006)O caso das savanas tropicais da América do Sul ilustra as complexas interrelações entre as características ecológicas dos ecossistemas terrestres naturais e os seus usos. As savanas tropicais estão determinadas por um ... -
Sistema de clasificación ecológico y mapas de ecosistemas: Enfoque conceptual-metodológico para Venezuela.
(Venezuela, 2013-01)El objetivo de este trabajo es presentar una propuesta metodológica de clasificación de la cobertura de la tierra bajo un enfoque ecológico que se estructura en tres niveles o escalas espaciales: las ecorregiones, los ... -
Carbon sequestration potencial of the Neotropical savannas of Colombia and Venezuela
(Lal, R., Cerri, C., Bernoux, M., Etchevers, J., Cerri, E. (Eds)., Estados Unidos, 2006) -
Dinámica sucesional de la vegetación en un sistema agrícola con descanso largo en el Altiplano central boliviano
(2006)Se estudió la dinámica sucesional de la vegetación en parcelas en descanso agrícola en el Altiplano central boliviano, donde se practica una agricultura con descansos largos en sectores manejados comunalmente. El objetivo ... -
Agricultural development and biodiversity conservation in the Páramo environments of the Andes of Mérida, Venezuela
(Spehn, E., Liberman, M., Körner, C. (Eds), Estados Unidos, 2006) -
Vegetation and grazing patterns in Andean environments: A comparison of pastoral systems in punas and páramos
(Spehn, E., Liberman, M., Körner, C. (Eds)., Estados Unidos, 2006-11-11) -
Flowering and fruit production dynamics of sweet pepper (Capsicum chinense Jacq) under different shade conditions in a humid tropical region
(2006)Growing sweet pepper (C. chinense) under shade has increased in the region south of Lake Maracaibo in Venezuela. We studied the effects of different shade conditions on the dynamics of flowering and fruit production of C. ... -
Functional diversity of wetland vegetation in the high-andean Páramo, Venezuela
(Spehn, E., Liberman, M., Körner, C. (Eds), Estados Unidos, 2006) -
Factors controlling decomposition of soil organic matter in fallow systems of the high tropical Andes: A field simulation approach using 14C- and 15N- labelled plant material
(2006)N-rich (C:N ¼ 27) and N-poor (C:N ¼ 130) wheat straw, labelled with 14C and 15N, was incubated for 2 yr in two major ecosystems of the upper elevation belt of cultivation in the high Andes: the moist Paramo (precipitation ... -
Cambios en la sabana de la estación biológica de Los Llanos Francisco Tamayo, Sociedad Venezolana de Ciencias Naturales, Calabozo, Venezuela
(Medina E, Hubber O, Nassar J, Navarro P. (Eds.). Recorriendo el Paisaje Vegetal de Venezuela. Ediciones IVIC, Caracas. Pp. 231-248., Venezuela, 2013) -
A characterization of the woody vegetation at the treeline in the Venezuelan Andes
(Global change and the World’s Mountains Perth Concert Hall – Horsecross Perth, Scotland, UK.p.p. 548-549, Reino Unido, 2010-09-30) -
The use of organic substrates with contrasting C/N ratio in the regulation of nitrogen use efficiency and lossesin a potato agroecosystem
(Nutrient Cycl Agroecosystems 88(3): 411–427, Venezuela, 2010-12-01)The effect of the application of organic amendments of contrasting C/N ratio, combined with mineral N fertilizer, on the N budget of a potato crop was evaluated. The hypothesis was that the combination of substrates of ... -
Actividades humanas que cambiaron el bosque en la Cordillera de Mérida: zona cafetalera-ganadera
(En Rial, A., Señaris, J., Lasso, C. Flores, A. (Eds). Evaluación rápida de la biodiversidad y aspectos socioecosistémicos del ramal de Calderas, Andes de Venezuela. RAP Bulletin of Biological Assessment 56. Conservation International, Arlington, VA. USA. pp. 112-119, Estados Unidos, 2010)La zona cafetalera-ganadera en Los Andes de Venezuela tiene su principal expresión en las vertientes húmedas de la cordillera de Mérida entre los 800 y 2000 m s.n.m. Los cultivos de café y los pastizales para ganadería ... -
Modelling the effects of fire and competition on the dynamics of neotropical savannas: from plants to community
(2005)Savannas are one of the most extensive biomes of the world and are subject to intense pressures due to large human populations using this ecosystem, even though it is characterized by low crop yields and poor nutritional ... -
Relaciones hídricas e intercambio de gases en Theobroma cacao var. Guasare bajo períodos de déficit hídrico
(2005)Se evaluó las relaciones hídricas y el intercambio de gases en Theobroma cacao var. Guasare bajo períodos de déficit hídrico. Se midieron las variables microclimáticas (temperatura del aire, humedad relativa y radiación ...