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Artículo

Risks of neglecting phenology when assessing climatic controls of primary production

Bandieri, Lucas MartínIcon ; Fernandez Alduncin, Roberto JavierIcon ; Bisigato, Alejandro JorgeIcon
Fecha de publicación: 05/2019
Editorial: Springer
Revista: Ecosystems
ISSN: 1432-9840
e-ISSN: 1435-0629
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geografía Física

Resumen

We evaluated the effect that integrating annual aboveground net primary production (ANPP) along different 12-month periods has on temporal modelsof productivity (ANPP as a linear function of annual precipitation). We studied Argentinean Patagonia, which encompasses a variety of climates and biomes. Using MODIS normalized difference vegetation index (NDVI) to estimate green biomass,we assessed the date of maximum annual NDVI for 2000?2016. One quarter of Patagonia (West/South region) exhibited a well-defined seasonality, withmaximum NDVI during spring?summer, whereas the rest (Central/East region) showed a much less well-defined maximum NDVI, generally during fall. Then we calculated temporal models for each pixel, considering both annual and seasonal precipitation (PPT), in two ways: (i) centered models, integrating NDVI for a period centered at the actual growing season, that is, July?June for West/Southregion and January?December for Central/East region, and (ii) displaced models, switching the NDVI integration period. Our results indicate that, with the centered models, 84% of the Central/East region exhibited significant temporal models, but only 52% of the West/South region did. For the displaced models, 60% (40%) of pixels of Central/ East (West/South) region changed their best predictor of ANPP. In general, the best predictor changed from current-year PPT to current-plusprevious- year PPT or from current-year fall to previous-year fall. Our results suggest that more attention must be paid in choosing the integration period for annual ANPP. This is more than a formal matter since the putative best predictor of ANPP can dramatically change depending on the assumed phenology.
Palabras clave: GROWING SEASON , NDVI , NPP , PATAGONIA , PHENOLOGY , PRECIPITATION , SEASONALITY , TEMPORAL MODELS
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/105928
URL: http://link.springer.com/10.1007/s10021-019-00393-7
DOI: https://doi.org/10.1007/s10021-019-00393-7
Colecciones
Articulos(IFEVA)
Articulos de INST.D/INV.FISIOLOGICAS Y ECO.VINCULADAS A L/AGRIC
Articulos(IPEEC)
Articulos de INSTITUTO PATAGONICO PARA EL ESTUDIO DE LOS ECOSISTEMAS CONTINENTALES
Citación
Bandieri, Lucas Martín; Fernandez Alduncin, Roberto Javier; Bisigato, Alejandro Jorge; Risks of neglecting phenology when assessing climatic controls of primary production; Springer; Ecosystems; 23; 1; 5-2019; 164-174
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