Evaluación de la variabilidad intra- e inter- individuo en el crecimiento secundario de árboles de las especies forestales Abies pinsapo y Pinus nigra
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2021-07-28
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Jaén: Universidad de Jaén
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[ES] Diferentes metodologías evalúan los patrones de crecimiento de los árboles, y cómo se relacionan con variables del entorno. Entre estos métodos destaca el análisis cronológico de los anillos de crecimiento. Estos anillos pueden desarrollar deformaciones que dificulten la datación, medición y cálculo de las tasas de crecimiento. El objetivo de este trabajo ha sido analizar distintos métodos de transformación de datos para obviar este efecto negativo de las deformaciones, en discos de tres rangos de tamaño de individuos de Abies pinsapo y Pinus nigra. En cada disco se analizado ocho series, con al menos una de ellas por una deformación, aplicando transformaciones sobre los datos de anchura de anillos. De todas las transformaciones, la mejor ha sido la media arrastrada de paso diez, que suaviza los máximos y mínimos, asemejando la serie deformada al promedio. Esto permite su uso para reconstruir las series sin el efecto de las deformaciones.
[EN] The patterns of tree growth can be analyzed by different analytical methods, being the most powerful the chronological analysis of the annual rings of growth, known as dendrochronology. These rings can suffer geometric deformations that make difficult the dating procedure, the measurement of width and the subsequent calculations of growth rates. Our object of study has been three-size-range discs obtained from individuals of the species Abies pinsapo and Pinus nigra. From each disc, eight series have been traced and analyzed, drawing one of them through a deformation and applying different data transformations on raw dat (ring width) The best results have been obtained from the ten-year running mean that softens the maximums and minimums of the series, reducing differences between the deformed series and the average series. This may allow for the regular use of this methodology, since the transformed series can be analyzed despite the presence of the deformations.
[EN] The patterns of tree growth can be analyzed by different analytical methods, being the most powerful the chronological analysis of the annual rings of growth, known as dendrochronology. These rings can suffer geometric deformations that make difficult the dating procedure, the measurement of width and the subsequent calculations of growth rates. Our object of study has been three-size-range discs obtained from individuals of the species Abies pinsapo and Pinus nigra. From each disc, eight series have been traced and analyzed, drawing one of them through a deformation and applying different data transformations on raw dat (ring width) The best results have been obtained from the ten-year running mean that softens the maximums and minimums of the series, reducing differences between the deformed series and the average series. This may allow for the regular use of this methodology, since the transformed series can be analyzed despite the presence of the deformations.