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617 resultados encontrados para: TEMA: Bosques tropicales
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Resumen en: Español |
Resumen en español

Here, we use 30 long-term, high-resolution palaeoecological records from Mexico, Central and South America to address two hypotheses regarding possible drivers of resilience in tropical forests as measured in terms of recovery rates from previous disturbances. First, we hypothesize that faster recovery rates are associated with regions of higher biodiversity, as suggested by the insurance hypothesis. And second, that resilience is due to intrinsic abiotic factors that are location specific, thus regions presently displaying resilience in terms of persistence to current climatic disturbances should also show higher recovery rates in the past. To test these hypotheses, we applied a threshold approach to identify past disturbances to forests within each sequence. We then compared the recovery rates to these events with pollen richness before the event. We also compared recovery rates of each site with a measure of present resilience in the region as demonstrated by measuring global vegetation persistence to climatic perturbations using satellite imagery. Preliminary results indeed show a positive relationship between pre-disturbance taxonomic richness and faster recovery rates. However, there is less evidence to support the concept that resilience is intrinsic to a region; patterns of resilience apparent in ecosystems presently are not necessarily conservative through time.


2.
Tesis - Maestría
Potencial de aprovechamiento de leña en bosques secundarios manejados en el sur del estado de Campeche, México / Efraín Aguirre Cortés
Aguirre Cortés, Efraín (autor) ; Macario Mendoza, Pedro A. (tutor) ; López Martínez, Jorge Omar (asesor) ; Pat Fernández, Juan Manuel (asesor) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2016
Clasificación: TE/333.953970972 / A3
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030008645 (Disponible)
Disponibles para prestamo: 1
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Índice | Resumen en: Español |
Resumen en español

El uso de leña, carbón y la biomasa vegetal es una práctica ancestral en la raza humana y ha sido analizada desde distintas perspectivas. Una plétora de estudios se ha desarrollado para evaluar las propiedades fisicoquímicas de los biocombustibles, particularmente de la biomasa forestal, así como sus implicaciones en el desarrollo de sistemas tecnológicos para su aprovechamiento. Sin embargo son pocos los estudios que relacionan el uso de la biomasa desde una perspectiva rural, así como sus implicaciones para la conservación de los servicios ecosistémicos. Los paisajes culturales representan entidades en donde hombre y naturaleza interactúan a través de distintas manifestaciones. Este trabajo exploró la relación que existe entre los habitantes rurales de un paisaje cultural y los beneficios que los ecosistemas forestales les ofrecen a partir del uso de subproductos forestales, particularmente la leña. Se entrevistaron 132 pobladores y se encontró que utilizan 60 especies forestales, provenientes principalmente de individuos muertos (95 %). Se observó que los pobladores no diferencian en la utilización de las especies duras. Observamos que las características principales para determinar el uso de la leña fue la disponibilidad del recurso y algunas características de los árboles de las cuales se extrae el recurso. Adicionalmente, nuestros resultados sugieren que existe relación entre el conocimiento local y la regeneración natural de los bosques tropicales, y la apropiación de la leña responde a una lógica de conservación y manejo de los bosques tropicales; y es un producto forestal no maderable de importancia cultural, socioeconómica y ecológica.

Índice

Resumen
Introducción
Artículo sometido a la Revista Chapingo Serie Ciencias Forestales y del Ambiente
Conclusiones
Anexos


3.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Impacts of early- and late-seral mycorrhizae during restoration in seasonal tropical forest, Mexico
Allen, Edith B. ; Allen, Michael F. (coaut.) ; Egerton-Warburto, Louise (coaut.) ; Corkidi, Lea (coaut.) ; Gómez-Pompa, Arturo (coaut.) ;
Contenido en: Ecological Applications : A Publication of the Ecological Society of America Vol. 13, no. 6 (December 2003), p. 1701-1717 ISSN: 1051-0761
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
B10173 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
Resumen en: Español |
Resumen en español

Disturbance of vegetation and soil may change the species composition of arbuscular mycorrhizal fungi (AMF), which may in turn affect plant species responses to AMF. Seasonal tropical forest in Mexico is undergoing rapid conversion to early-successional forest because of increased wildfire and may require restoration. The responses of six early- and late-successional tree species were tested using early- and late-successional AMF inoculum. The plants were germinated in the shadehouse and received three inoculum treatments: (1) soil from a two-year-old burned site, (2) soil from a mature forest site, or (3) uninoculated controls. They were transplanted as seedlings to a site prepared by burning, and their growth was measured from September 1997 to November 2000. All six species had the greatest growth response to early-seral inoculum, but the response to late-seral inoculum varied. Two tree species, Ceiba pentandra and Guazuma ulmifolia, were smallest with late-seral inoculum, even smaller than the uninoculated plants, and the other species, Brosimum alicastrum, Havardia albicans, Acacia pennatula, and Leucaena leucocephala, had intermediate growth with late-seral inoculum.

Of these, Brosimum, Havardia, and Ceiba occur in late-successional forest, and the others are early seral. Of the several growth measurements (height, cover, biomass, stem diameter), stem-diameter responses to inoculum were still significantly different into the third year for four of the species. The uninoculated plants became infected by residual inoculum in the burned experimental site within three months of transplanting, yet mycorrhizal responses persisted. The treatment size differences may be due to different species composition of the inocula. The early-seral inoculum was dominated by small-spored Glomus spp., while the late-seral inoculum had a higher density of large-spored Gigasporaceae. The latter are known from greenhouse experiments to promote a smaller plant-growth response than Glomus. Mature forest trees may withstand the carbon drain from Gigasporaceae better than establishing seedlings, so the growth patterns we observed with inoculum source are consistent with a rapidly growing successional forest, followed by slower-growing mature forest. The results suggest that early-seral AMF should be used when seedlings are inoculated for restoration, even for late-seral tree species.


4.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Effects of mycorrhizae and nontarget organisms on restoration of a seasonal tropical forest in Quintana Roo, Mexico: factors limiting tree establishment
Allen, Michael F. ; Allen, Edith B. (coaut.) ; Gómez Pompa, Arturo (coaut.) ;
Contenido en: Restoration Ecology Vol. 13, no. 2 (june 2005), p. 325-333 ISSN: 1061-2971
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
B5423 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal

5.
Libro
Modelos de dinámica de parches en selvas tropicales / Elena R. Alvarez Buylla, Raúl García Barrios ; traducción del inglés de Sofía Figeman
Alvarez Buylla, Elena R. ; García Barrios, José Raúl (coaut.) ; Figeman, Sofía (tr.) ;
Distrito Federal, México : Centro de Investigación y Docencia Económicas , 1992
Clasificación: F/330.0705 / D6/9
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
SAF002478 (Disponible)
Disponibles para prestamo: 1

6.
Libro
Almacenamiento de carbono: en ecosistemas terrestres para mitigar el cambio climático global / María Cristina Amézquita, Enrique Murgueitio R., César Augusto Cuartas, María Elena Gómez
Amézquita, María Cristina ; Murgueitio R., Enrique (coaut.) ; Cuartas, César Augusto (coaut.) ; Gómez, María Elena (coaut.) ;
Turrialba, Costa Rica : Centro para la Investigación en Sistemas Sostenibles de Producción Agropecuaria :: Wageningen University :: Universidad de la Amazonia , 1986
Clasificación: F/634.99 / A4
Bibliotecas: Villahermosa
Cerrar
SIBE Villahermosa
ECO050003151 (Disponible)
Disponibles para prestamo: 1

7.
Libro
Forest litter insect communities: biology and chemical ecology / T. N. Ananthakrishnan
Ananthakrishnan, T. N. ;
New Delhi : Science Publishers , c1996
Clasificación: 595.2 / A5
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
ECO020003879 (Disponible)
Disponibles para prestamo: 1

8.
Libro
Alternatives to deforestation: steps toward sustainable use of the amazon rain forest / Edited by Anthony B. Anderson
Anderson, Anthony B. (ed.) ;
New York : Columbia University Press , 1990
Clasificación: 333.75137 / A48
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030007156 (Disponible)
Disponibles para prestamo: 1

9.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Leaf litter inhabiting beetles as surrogates for establishing priorities for conservation of selected tropical montane cloud forests in Honduras, Central America (Coleoptera; Staphylinidae, Curculionidae)
Anderson, Robert S. ; Ashe, James S. (coaut.) ;
Contenido en: Biodiversity and Conservation Vol. 9, no. 5 (May 2000), p. 617-653 ISSN: 0960-3115
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
B8666 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
Resumen en: Inglés |
Resumen en inglés

Thirteen tropical montane cloud forests (TMCFs) in Honduras and adjacent El Salvador were evaluated for species diversity and endemism in leaf litter inhabiting Curculionidae (weevils) and Staphylinidae in June and August of 1994. Totals of 26,891 specimens representing 293 species of Curculionidae, and 7349 specimens representing 224 species of Staphylinidae, were collected. Regional endemism was high with 173 species (58.7% of total) of Curculionidae and 126 species (56.3% of total) of Staphylinidae, restricted to single sites. Measures of diversity (number of observed species [Sobs]; number of endemic species) and estimates of biodiversity (Chao 2, first and second order Jackknife and Bootstrap richness estimators) are given for each site for Curculionidae and Staphylinidae. Priority-areas analyses based on Sobs (Greedy), Sobs, Chao 2, number of endemic species, site complementarity and higher taxonomic diversity (Curculionidae only) are presented. Weak or lack of correlation was noted between site area and site diversity for either Curculionidae or Staphylinidae. The optimum sequence for site conservation was determined based on Sobs (Greedy). Four sites are identified as the highest conservation priorities; Parque Nacional Montecristo, P.N. La Muralla, P.N. Santa Barbara and P.N. Comayagua. Identification as high priority sites supports their designation as Parques Nacionales rather than the less diverse Reservas Biologias or Reservas Vidas Silvestres

While closely approximating performance of Sobs (Greedy), no one of Sobs, number of endemics, Chao 2 or site complementarity give results equivalent to the optimum sequence based on Sobs (Greedy) and the latter is concluded to be the best method for establishing conservation priorities in TMCF. Results of the analyses based on one of Curculionidae or Staphylinidae differ in the ordering of site priorities based on each of Sobs, Chao 2 or number of endemics at each site, with at best, weak positive correlations between results based on each taxon. Data from other taxa are necessary to determine if one of Curculionidae or Staphylinidae emerges as the better surrogate for general patterns of biodiversity in TMCF. Conservation strategies in Central America should emphasize the importance of TMCF particularly in view of high regional endemism. In formulating these strategies, consideration needs to be given to the preservation of many small regional preserves rather than fewer larger preserves. Data from inventories of other taxa should be included where available and all biological data should be integrated with social and cultural issues of regional importance


10.
Libro
Agricultural technologies and tropical deforestation / edited by A. Angelsen and D. Kaimowitz
Angelsen, Arild (ed.) ; Kaimowitz, David (coed.) ;
Oxford, England : CAB International , c2001
Clasificación: 333.75137 / A4
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
SAA008194 (Disponible)
Disponibles para prestamo: 1