Indicadores MODIS para formaciones vegetales de lenga (nothofagus pumilio) en la Patagonia chilena.
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Date
2024
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Universidad de Concepción
Abstract
Este estudio se centró en analizar la dinámica ecológica del ecosistema de lenga (Nothofagus pumilio) en la región de Aysén durante un período de cinco años (2018-2022), utilizando el análisis de productos MODIS. Se investigaron las relaciones entre variables claves, como la Evapotranspiración (ET), el Índice de Área Foliar (LAI), la Fracción de Radiación Fotosintéticamente Activa (FPAR) y Temperatura de Superficie Terrestre (LST) tanto diurna como nocturna. Para modelar estas relaciones, se aplicaron funciones cúbicas, cuadráticas y lineales, seleccionando aquellas en función de su desempeño estadístico y validez probada. Los resultados resaltaron la influencia significativa de la estacionalidad, la cual está vinculada al ciclo de vida de la lenga, una especie caducifolia, esto afecta las mediciones de todas las variables estudiadas, así como los cambios de temperatura a lo largo del año. Se observó que la evapotranspiración desempeña un papel crucial al regular la temperatura superficial y al modular las complejas interacciones entre las variables. Las conclusiones de este estudio se enfatizaron en la importancia de considerar la variabilidad estacional y la influencia de la evapotranspiración. También se destacó la necesidad de utilizar modelos estadísticos que se ajusten de manera más precisa a la realidad como herramientas metodológicas sólidas. Este estudio contribuye al entendimiento de la dinámica ecológica en ecosistemas de bosques de lenga y proporciona una base sólida para la toma de decisiones en la gestión de los recursos naturales relacionados con la lenga en la región de Aysén.
This study delves into the ecological dynamics of the lenga ecosystem (Nothofagus pumilio) within the Aysén region, spanning a five-year period from 2018 to 2022, utilizing an analysis of MODIS products. It explores the intricate relationships among key variables, including Evapotranspiration (ET), Leaf Area Index (LAI), Fraction of Photosynthetically Active Radiation (FPAR), and diurnal and nocturnal Land Surface Temperatures (LST). To model these relationships, we employed cubic, quadratic, and linear functions, meticulously chosen based on their statistical robustness and adherence to rigorous validity tests. Our findings clarified the substantial impact of seasonality, intimately tied to the deciduous life cycle of the lenga tree, on the measurements of all the studied variables, alongside the year-round temperature fluctuations. The pivotal role of evapotranspiration as a regulatory force governing surface temperature and orchestrating intricate interactions among these variables is a key highlight of our results. Our conclusions underscore the imperative of accounting for seasonal variations and the omnipresent influence of evapotranspiration. Moreover, they emphasize the adoption of statistical models that faithfully mirror real-world complexities, serving as dependable methodological tools. In sum, this study enriches our comprehension of ecological dynamics within analogous ecosystems and furnishes a solid foundation for informed decision-making in the stewardship of natural resources associated with the lenga ecosystem in the Aysén region.
This study delves into the ecological dynamics of the lenga ecosystem (Nothofagus pumilio) within the Aysén region, spanning a five-year period from 2018 to 2022, utilizing an analysis of MODIS products. It explores the intricate relationships among key variables, including Evapotranspiration (ET), Leaf Area Index (LAI), Fraction of Photosynthetically Active Radiation (FPAR), and diurnal and nocturnal Land Surface Temperatures (LST). To model these relationships, we employed cubic, quadratic, and linear functions, meticulously chosen based on their statistical robustness and adherence to rigorous validity tests. Our findings clarified the substantial impact of seasonality, intimately tied to the deciduous life cycle of the lenga tree, on the measurements of all the studied variables, alongside the year-round temperature fluctuations. The pivotal role of evapotranspiration as a regulatory force governing surface temperature and orchestrating intricate interactions among these variables is a key highlight of our results. Our conclusions underscore the imperative of accounting for seasonal variations and the omnipresent influence of evapotranspiration. Moreover, they emphasize the adoption of statistical models that faithfully mirror real-world complexities, serving as dependable methodological tools. In sum, this study enriches our comprehension of ecological dynamics within analogous ecosystems and furnishes a solid foundation for informed decision-making in the stewardship of natural resources associated with the lenga ecosystem in the Aysén region.
Description
Tesis presentada para optar al título profesional de Ingeniero en Conservación de Recursos Naturales
Keywords
Lenga, Monitoreo ambiental Chile, Patagonia (Chile)