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636,460 artículos
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Año:
2025
ISSN:
2256-201X, 0120-0739
Ordoñez, Juan Camilo; López, Margarita; López, Andrés Nicolás; Morales Liscano, Gustavo; Parra Sánchez, Edicson
Universidad Distrital Francisco José de Caldas
Resumen
Cloud forests are megadiverse. This study analyzes the diversity of orchids in different types of plant cover in the Integrated Management District of Cuchilla de Peñas Blancas by means of five longitudinal transects. Epiphyte orchids were inventoried according to their vertical stratification, and the similarity between vegetation types was assessed. 60 orchid species were recorded, including nine endemic ones (Acianthera adeodata, Cyrtochilum baldeviamae, C. ioplocon, Dracula psittacina, Epidendrum fusagasugaënse, E. cleistocoleum, E. mamapachae, Oncidium luteopurpureum, and Platystele schneideri) and a new endemic species for Colombia. The trunk was the area of the phorophytes with the greatest abundance. Some species at risk were identified: one near threatened one (O. luteopurpureum), one endangered (Masdevallia caudata), and two vulnerable (C. ioplocon and D. psittacina). The diversity of species in these threatened and disturbed ecosystems will provide a basis for understanding community dynamics and develop management and conservation strategies.
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Año:
2025
ISSN:
2256-201X, 0120-0739
Cervantes-Machuca, María Mercedes; Rodríguez Vásquez, Marcos Emilio; Rodríguez-Ortiz, Gerardo; Martínez-Santiago, Daniel
Universidad Distrital Francisco José de Caldas
Resumen
It is necessary to carry out research that generates materials of superior genetic quality for Pinus pseudostrobus Lindl. and ensures survival and timber production. The objective of this study was to evaluate the growth and initial increment in families of selected P. pseudostrobus Lindl. trees, as well as the qualitative characteristics that determine the commercial quality of the stand. The trial (40 families) was established in 2013 under of a randomized complete block design, and, in 2020, both timber growth and qualitative variables were assessed using parametric and non-parametric analysis of variance. Significant differences (p≤0.01) were observed between tree families for diameter, height, clear bole length, basal area, volume, and the mean annual increment (MAI). Family 15 exhibited a volume MAI of 12.41 m3.ha-1, with a 52.3% gain over the genetic control. The evaluation of trees at an early age allows determining their quality.
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Año:
2025
ISSN:
2256-201X, 0120-0739
Jaime Huamán, Emerson; Aponte, Héctor; Damián-Parizaca, Alexander; La Torre-Cuadros, María
Universidad Distrital Francisco José de Caldas
Resumen
This research sought to perform an economic valuation of the carbon reserve in the aerial biomass (RCBA) of two types of vegetation cover in the Amaru-Huachocolpa-Chihuana Cloud Forest Regional Conservation Area (ACRBNA), Huancavelica, Peru. To this effect, we estimated the aboveground biomass of two 0.5 ha plots established in an altimontane mountain forest (P1) and a montane mountain forest (P2). The RCBA was higher in P2, with 36.78 tC (74 tC.ha-1), reaching an economic value of USD$ 5726. The five species with the greatest contribution to the carbon reserve represented 46.61%. The RCBA value for P1 was 20.72 tC (41 tC.ha-1), reaching an economic value of USD$ 3226, and the five species with the greatest contribution represented 70.27% of the total biomass value. These data facilitate the development of a carbon credit proposal and constitute the basic information for economically valuing carbon reserves.
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Año:
2025
ISSN:
2256-201X, 0120-0739
Ávila Arias, Carlos; Chinchilla Mora, Orlando; Meza Picado, Víctor; Fonseca González, William; Arias Aguilar, Dagoberto
Universidad Distrital Francisco José de Caldas
Resumen
Forest production systems provide goods and services for the well-being of humanity, as well as for mitigating climate change. This research evaluated the initial growth of clonal mahogany (Swietenia macrophylla) in a greenhouse, in response to chemical fertilization. A randomized complete block trial was established, with six treatments and five repetitions. The nutritional elements were N, B, Ca, Zn, and Mg, and each treatment corresponded to the absence of one of these elements. The increase in diameter at the base and the total height was calculated for each plant over seven months. No statistically significant differences were recorded between treatments. However, the weight of the effect of each treatment was distinct. The results indicate that the absence of N > Zn > Mg limited plant development to the greatest extent. Therefore, these elements must be present in the fertilization of mahogany clones in greenhouses.
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Año:
2025
ISSN:
2256-201X, 0120-0739
Carvajal Ortiz , Alex Javier; Romero Ramírez, Brayan Armando; Díaz-López, Sandra Milena; Bolívar-Santamaría , Sergio
Universidad Distrital Francisco José de Caldas
Resumen
The tropical Andes are a biodiversity hotspot, but the fragmentation of their landscapes due to land use changes towards livestock farming and agriculture has led to the loss of ecosystem services. This study identified key areas to reconnect forest fragments in the eastern mountain range of Colombia and improve the connectivity of La Llanada National Civil Society Reserve. Coverage classifications were performed, and fragmentation and connectivity metrics were estimated, employing multicriteria analysis to prioritize the areas to be connected through agroforestry systems. The landscape matrix shows a dense forest cover (Bd), with 135 fragments out of 1227 identified. Although the Bd exhibits spatial continuity, the patches are irregular, affecting connectivity. The proposed methodology aids in defining priority zones for implementing agroforestry systems, enhancing connectivity and conservation between forest fragments.
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Año:
2025
ISSN:
2256-201X, 0120-0739
Rey Guerra, Carlos Vicente; Monroy Rodríguez, Laura julieth; Lozano Benavides, Luisa Fernanda; Ramirez, Omar; Quirama Aguilar, Miguel
Universidad Distrital Francisco José de Caldas
Resumen
The growth and densification of cities poses major challenges associated with air pollution and public health. This study examines the capacity of a model tree barrier located near two roads with heavy traffic to reduce exposure to particulate matter (PM10 and PM2.5). A forest inventory of the barrier was conducted and, using the i-Tree Eco software, its PM removal capacity was estimated, showing an annual removal of 61.1 kg, out of which 15.4 kg correspond to PM2.5 and 45.7 kg to PM10. In this specific case, exotic species exhibited a greater removal than native ones. These findings are significant in determining the benefits of urban trees concerning air quality, as well as in generating guidelines for the design of tree barriers that mitigate the population’s exposure to PM.
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Año:
2025
ISSN:
2256-201X, 0120-0739
Arboleda Mendez, Camila; Armbrecht, Inge; Bautista Giraldo, Maria Alejandra
Universidad Distrital Francisco José de Caldas
Resumen
This study evaluated whether ant diversity is related to habitat type, intensification (IT), and proximity to the forest in sugarcane and pasture matrices in tropical dry forests (bs-T) of the geographical Cauca River valley. The myrmecofauna of six matrices (three pastures and three sugarcane fields) was analyzed, recording measurements of six habitat variables. Significant differences were found in ant richness and composition between the habitats, as well as a trend of decreasing richness with IT. Moreover, it was found that, as the distance from the forest to the interior of the matrices increases, the average richness decreases. It is concluded that agroecosystem management influences the diversity and presence of ant communities, and, therefore, that it is necessary to favor their complexity (heterogeneity) in order to promote their conservation.
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Año:
2025
ISSN:
2256-201X, 0120-0739
Raygada Rengifo, Danixa Alexandra; Rodríguez Cabrera, Edward Hanz; Urbina-Arévalo, Flavia Alexa; Cachique Huansi, Danter; Salazar-Vega, Ángel Alejandro; A. Miranda, Ires Paula; Mejía, Kember; R. del-Castillo, Ángel Martín
Universidad Distrital Francisco José de Caldas
Resumen
Phytelephas macrocarpa is a palm tree of ecological and economic importance, especially due to the export of its seeds for handicrafts. However, it suffers from overexploitation and habitat degradation, which affects its sustainability and the livelihoods of local communities. This study evaluated its density, population structure, and regeneration in the northwestern Peruvian Amazon while also describing the environment which it grows. Ten 1000 m2 plots were established, recording 3824 palms in four categories: seedlings (2134), saplings (436), subadults (252), and adults (1002). Seedlings showed the highest density (2134 ind.10 000m-2), with the locality of Ahuashillo standing out for the highest regeneration index (4.200). This species thrives in dry, premontane, and humid forests, up to 663 m in altitude, and half of its populations exhibit sustainable regeneration, whereas the others reflect their current and historical management, as well as changes in vegetation cover.
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Año:
2025
ISSN:
2256-201X, 0120-0739
Díaz-Rueda, Daniel Mauricio; Herrera-Pacheco, Mayra Alejandra; Plata-Castro, Angelo Danilo; Ardila-Hurtado, Silvia Fernanda; Reu, Björn
Universidad Distrital Francisco José de Caldas
Resumen
This study analyzes the floristic composition and diversity of three vegetation covers in the northern sector of Serranía de Los Yariguíes. 40 plots were established in three localities (1.6 ha sampled). 2804 individuals with DBH ≥ 2.5 cm were recorded, distributed among 63 families, 155 genera, and 274 species. The most abundant species, genus, and family are Calycolpus moritzianus, Miconia, and Me-lastomataceae, respectively. The family and genus with the highest species richness are Lauraceae and Miconia. The conserved forest has the highest species richness and diversity (183), followed by the secondary forest (146). The agroforestry system, although it exhibits lower diversity and richness, maintains high evenness and contains a significant proportion of native species (57%). This study documents the first record of Trigonobalanus excelsa for the region and Caryodaphnopsis yariguiensis, a new species. Likewise, it contributes with base knowledge for conservation and ecological restoration projects in the region.
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Año:
2025
ISSN:
2256-201X, 0120-0739
Lozano Carpio, Pablo Enrique; Klitgaard, Bente; Palacios, Walter; Santiana, Janeth; Medina, Byron; Morales, Carlos; Iglesias, Juan
Universidad Distrital Francisco José de Caldas
Resumen
The Chocó biome is characterized by high levels of precipitation, temperature, and endemism within a threatened landscape. This study compared the forest structure, floristic diversity, and forest ecology patterns of the Chocoan forests within the Esmeraldas province of Ecuador. In four permanent plots (4 ha), all trees with a diameter at breast height ≥ 10 cm were recorded. A data analysis regarding forest structure and floristic ecology showed a range of 441-624 individual trees per hectare with an average diameter of 21 cm, over a range of 10-202 cm, and a basal area of 24-34 m2. Meanwhile, the Simpson index exhibited great variation in alpha diversity, ranging from 9.12 to 45.12, with a total richness of 79 families and 360 species. In addition, a non-metric multidimensional scaling analysis revealed a high beta diversity. 18 endemic species were recorded, highlighting the importance of the bioregion for conservation.
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Hecho en México, Universidad Nacional Autónoma de México (UNAM). 1997-2025.
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