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Ecología Aplicada

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TIEDEMANN, José Luis. Forest phenology of Semiarid-Chaco and Chaco-Serrano natural sub-regions in Santiago del Estero, Argentina. Ecol. apl. [online]. 2011, vol.10, n.2, pp.51-59. ISSN 1726-2216.

This paper aims at determining the phenological parameters of the native forest of the Semiarid-Chaco and Serrano-Chaco natural regions in the province of Santiago del Estero, Argentina, using TIMESAT software and the temporal series of NDVI VEGETATION SPOT. Since the study was carried out during a period (1998 to 2009) affected by ENSO, both wet and dry seasons were taken into account. Samples of the Semiarid Chaco forest, and Sierras de Guasayan and Sierras de Sumampa-Ambargasta mountain forests were analyzed. The Semiarid Chaco forest and Sierras de Sumampa-Ambargasta mountain forests showed variations at the beginning of the growing seasons between periods. Sumampa-Ambargasta mountain forests were the most affected. During the wet period, the Semiarid Chaco forest experienced its midpoint in autumn while Sierras de Guasayan and Sierras de Sumampa-Ambargasta mountain forests had theirs in summer. However, during the dry period the three areas underwent their midpoints in autumn. This displacement could be related to the strategic adaptations of the middle and lower forest strata to efficient water use. The Semiarid Chaco forest experienced, in both periods, growing seasons with similar fully integrated production, base and width. On the other hand, Sierras de Guasayan forest showed growing seasons with more fully integrated production in the dry season, a fact that could be the result of NDVI saturation effect during the wet period. Sumampa-Ambargasta mountain forests had similar growing seasons with fully integrated production in both periods. However, the growing season during the dry period had smaller base, length and width. The productivity of the seasonally active vegetation of the three areas showed no significant differences between the periods, which could be due to their greater biodiversity, stratification and the presence of woody species with deep roots.

Keywords : NDVI; VEGETATION SPOT; TIMESAT; ENSO; Semiarid Chaco and Serrano Chaco; growing season; wet and dry period.

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