Evaluación de parámetros poblacionales y la regeneración natural de bursera graveolens (kunth) triana & planch, en el sector Malvas, cantón Zapotillo, Ecuador
The study of population dynamics is essential for the management of dry forests; these are ecosystems with a high degree of threat and little studied. Bursera graveolens (Kunth) Triana & Planch, is a typical species of this ecosystem and has ecological and economic importance for human the popul...
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| Formato: | bachelorThesis |
| Idioma: | spa |
| Publicado em: |
2021
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| Assuntos: | |
| Acesso em linha: | https://dspace.unl.edu.ec/jspui/handle/123456789/23994 |
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Adicionar Tag | Resumo: | The study of population dynamics is essential for the management of dry forests; these are ecosystems with a high degree of threat and little studied. Bursera graveolens (Kunth) Triana & Planch, is a typical species of this ecosystem and has ecological and economic importance for human the population that uses it ancestrally and currently for the extraction of essential oil; In addition, their populations suffer changes due to the constant overgrazing of goats and inappropriate use. This research was carried out with the aim of evaluating population parameters: spatial distribution, population density, age structure and the natural regeneration of Bursera graveolens, in the Malvas sector, Zapotillo canton. Systematic sampling was carried out establishing 18 temporary plots of 20 m x 20 m with a separation of 250 m between plots, height data, DAP, geographical coordinates, and phytosanitary states were recorded. To gather natural regeneration information, each plot was divided into subplots, according to the categories: seedlings and sapling subplots of 2 m x 2 m, low latizal of 5 m x 5 m subplots and high latizal of 10 m x 10 m subplots. To determine the spatial distribution the Standardized Morisita Index (Ip) and Near Neighbor Analysis was used in Qgis, the population density was determined by applying the absolute density formula, for the age structure the grouping of individuals in diametric classes was used, and for the assessment of natural regeneration, the structural parameters relative density, frequency, and Importance Value Index were calculated. The spatial distribution pattern of Bursera graveolens, using the Standardized Morisita index is uniform (- 0,087), the density is 119 individuals/ha, the age structure shows that the largest number of individuals is grouped between 22,60 cm and 25,74 cm of DAP with 19 individuals, followed by the diametric class between 25,75 cm to 28,89 cm of DAP with 18 individuals. Natural regeneration is scarce, the category containing the highest number of individuals is sapling with 114 individuals/ha, also being the one with the highest Importance Value Index. It was determined that the population of Bursera graveolens is mostly made up of adult individuals, it is also evident that the regeneration of the species is scarce, mainly due to overgrazing and anthropic fruit and seed collection activities for obtaining essential oils. Keywords: population parameters, spatial distribution, population density, age structure, natural regeneration, Bursera graveolens. |
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