Last updated: 2021-05-19

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Knit directory: booksn_ppm/

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Preparación de datos

En este script partimos de los datos originales de COPLAS desde 1992-2019 y generamos un data.frame “limpio” (corrección de errores), con la elevación y la especie de pino. Este dataset se guarda en /data/coplas2019.csv.
Para el análisis de los datos de Sierra Nevada, vamos a generar un buffer de diferentes distancias para ver que parcelas elegimos. El proceso puede verse aquí. Hemos cogido un buffer de 20 km y hemos añadido algunas parcelas (de Motril), y hemos eliminado algunas de Sierra Alhamilla. Los datos están en: /data/coplas2019sn.csv.

Exploración del patrón temporal

Vamos a explorar el patrón temporal de los niveles de infestación medios por año, agrupados por grupo de elevación y por especie.
Nos quedamos con la agrupación por especie. Seleccionamos 4 especies (P. nigra, P. halepensis, P. sylvestris, P. pinaster)
Los resultados pueden verse aquí

Análisis de Mann-Kendall

Analizmos las tendencias temporales para cada parcela utilizando el test no paramétrico de Mann-Kendall.

Análisis de Disparidad de las series de datos

Disparidad entre los valores de infestación entre años para cada parcela
Variabilidad para cada serie de datos (cada parcela)
Resultados aquí
Mas información sobre estos índices: (Fernández‐Martínez et al. 2018; Fernández‐Martínez and Peñuelas 2021; Heath and Borowski 2013)

Relación nivel de infestación con la NAO

Re-visitamos el trabajo de Hódar, Zamora, and Cayuela (2012), y volvemos a explorar la relación entre la NAO y el % de parcelas con nivel de infestacion >= 3.
Análisis exploratorio aquí

Referencias

Fernández‐Martínez, Marcos, and Josep Peñuelas. 2021. “Measuring Temporal Patterns in Ecology: The Case of Mast Seeding.” Ecology and Evolution, March, ece3.7291. https://doi.org/10.1002/ece3.7291.

Fernández‐Martínez, Marcos, Sara Vicca, Ivan A. Janssens, Jofre Carnicer, Javier Martín‐Vide, and Josep Peñuelas. 2018. “The Consecutive Disparity Index, D : A Measure of Temporal Variability in Ecological Studies.” Ecosphere 9 (12): e02527. https://doi.org/10.1002/ecs2.2527.

Heath, Joel P., and Peter Borowski. 2013. “Quantifying Proportional Variability.” Edited by Shu-Dong Zhang. PLoS ONE 8 (12): e84074. https://doi.org/10.1371/journal.pone.0084074.