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This paper aims at determining the phenological par ameters 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 (19 98 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. S umampa-Ambargasta mountain forests were the most affected. During the wet period, the Semia rid 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 t he three areas underwent their midpoints in autumn. This displacement could be related to the s trategic 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 produ ction, 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 se ason during the dry period had smaller base, length and width. The productivity of the seasonall y active vegetation of the three areas showed no

FENOLOGÍA DEL BOSQUE DE LAS SUBREGIONES NATURALES: CHACO SEMIÁRIDO Y CHACO SERRANO, DE SANTIAGO DEL ESTERO, ARGENTINA