enero - junio 2005 http://www.saber.ula.ve/handle/123456789/5002 2026-05-06T11:11:18Z 2026-05-06T11:11:18Z http://www.saber.ula.ve/handle/123456789/25575 2018-03-14T10:08:03Z 2007-10-22T09:00:00Z

Ecotropicos

2007-10-22T09:00:00Z Segnini, Samuel Chacón, Marleny http://www.saber.ula.ve/handle/123456789/25578 2018-03-14T10:08:05Z 2005-11-17T09:00:00Z

Caracterización fisicoquímica del hábitat interno y ribereño de rios andinos en la cordillera de Mérida, Venezuela. Segnini, Samuel; Chacón, Marleny

2005-11-17T09:00:00Z http://www.saber.ula.ve/handle/123456789/25576 2018-03-14T10:08:04Z 2005-11-17T09:00:00Z

Resúmenes de tesis.

2005-11-17T09:00:00Z Sarmiento, Guillermo Pinillos, Marcela Garay, Irene http://www.saber.ula.ve/handle/123456789/25579 2018-03-14T10:08:06Z 2005-11-16T09:00:00Z

Biomass variability in tropical American lowland rainforests Sarmiento, Guillermo; Pinillos, Marcela; Garay, Irene Tropical forest accumulates one of the largest biomasses among terrestrial ecosystems, however its precise amount and patterns of spatial variation are still imperfectly known. We discuss these issues on the basis of available data on the most widespread type of tropical American lowland rainforest (terra firme forest), considering the estimates of live tree aboveground biomass (LTAB) and total aboveground biomass (TAGB), in old-growth stands in different regions, and suggest probable sources of their broad variation. Methodological shortcomings arising from sampling design and intensity, size of sample unit,and allometric equations used to calculate biomass from field data are firstly considered. TAGB estimates based on 0.25 to one hectare plots ranged throughout the region from 160 to 435 Mg ha-1, while estimates of LTAB range from 167 to 419 Mg ha-1. With smaller plots, the range extends from 115 to 864 Mg ha-1. Structural differences concerning biomass distribution among two other life-forms: palms and woody lianas, and its allocation among plant structures, also show broad variation, contributing to the richness and variety of rainforest types. Amounts and patterns of vertical variability of root biomass are still much less known, and the scarcity of field data makes difficult to disclose either general patterns or determining factors. The available data suggest that belowground biomass reaches at least about 20% of the aboveground counterpart. Distribution of fine roots illustrates the contrasted patterns and show how they are exploiting different soil horizons. Conclusions stress the large variability in structural features among tropical American lowland rainforests. Apart from variation due to methodological procedures, there are real differences in biomass among old-growth forest types, which are evident at all spatial scales, from the single plot to the whole area of this biome.

2005-11-16T09:00:00Z Pratolongo, Paula Kandus, Patricia http://www.saber.ula.ve/handle/123456789/25577 2018-03-14T10:08:05Z 2005-11-16T09:00:00Z

Dinámica de la biomasa aérea en pajonales de Scirpus giganteus y juncales de Schoenoplectus californicus en la zona frontal del Bajo Delta del río Paraná (Argentina). Pratolongo, Paula; Kandus, Patricia

2005-11-16T09:00:00Z Smith Pinto, Susan Silva Armas, Juan F. Fariñas G, Mario R. http://www.saber.ula.ve/handle/123456789/25580 2018-03-14T10:08:06Z 2005-11-16T09:00:00Z

Geomorphology, soil texture and tree density in a seasonal savanna in eastern Venezuela. Smith Pinto, Susan; Silva Armas, Juan F.; Fariñas G, Mario R.

2005-11-16T09:00:00Z