Abstract

TIEDEMANN, José Luis. Phenology and aboveground net primary productivity of Panicum maximum pastoralist systems in the department of Moreno, Santiago del Estero, Argentina, derived from MODIS NDVI. Ecol. apl. [online]. 2015, vol.14, n.1, pp.27-39. ISSN 1726-2216.

Phenological parameters and net primary productivity of Panicum maximum pastoralist systems in the Department of Moreno, Santiago del Estero, Argentina, in the period 2008-2014 were determined from MODIS NDVI time series. The start, midpoint and end of growing seasons had higher frequency, respectively, in January, March and June. Significant differences (p <0.01) in the Amplitude, Base and aboveground net primary production (ANPP) between growing seasons due to anomalies in seasonal rainfall were found. Growing seasons with high length and amplitude had higher ANPP. Significant direct relationship between the Amplitude and ANPP were found (r² 0.50). However, relationships between the Base and ANPP (p > 0.05) were not found. ANPP in growing seasons with negative anomalies of rainfall was: 1790.2 kg dm ha^-1 (2008-2009) and 3085.22 kg dm ha^-1 (2012-2013). In growing seasons with positive anomalies of rainfall, ANPP was: 9245.23 kg dm ha^-1 (2009-2010); 11562.31 kg dm ha^-1 (2010-2011), 10514.00 kg dm ha^-1 (2011-2012) and 9528.51 kg dm ha^-1 (2013-2014). ANPP growing seasons with drought was 78.7% lower than ANPP growing seasons with positive anomalies of average rainfall. The MODIS NDVI time series are an invaluable tool for determining the receptivity of pastoral systems and for preventing and / or mitigate adverse weather extremes such as droughts.

Keywords : NDVI; phenology; drought; aboveground net primary productivity; Panicum maximum.

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