IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
artículos
Título:
Annual and seasonal variation of NDVI explained by current and previous precipitation across Northern Patagonia
Autor/es:
FABRICANTE, I.; OESTERHELD, M.; PARUELO, J.M.
Revista:
JOURNAL OF ARID ENVIRONMENTS
Editorial:
ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD
Referencias:
Año: 2009 vol. 73 p. 745 - 753
ISSN:
0140-1963
Resumen:
Temporal variation of aboveground net primary production (ANPP) of arid ecosystems has been associated
with precipitation regimes with different results. The objective of this paper was to characterize
the relationship between interannual variation of annual and seasonal Normalized Difference Vegetation
Index (NDVI), as a surrogate for ANPP, and precipitation in the steppes of Northern Patagonia. In 11 sites
encompassing a wide range of conditions and vegetation physiognomies, we studied a 20-year monthly
data set of NDVI and precipitation. We took into account the precipitation of current, as well as previous
periods of variable length. Interannual variation of annual NDVI was little correlated with annual
precipitation, either current or previous. In contrast, it was highly and widely correlated with precipitation
accumulated during a few months of the previous growing season. Interannual variation of
seasonal NDVI was little correlated with current seasonal precipitation. In contrast, it was significantly
correlated with precipitation accumulated during previous periods of variable length according to the
season and site under consideration. NDVI was more tightly coupled with precipitation in drier
ecosystems. Lags of response between NDVI and precipitation provide an opportunity for forecasting
ANPP and suggest even longer lags between climatic variation and herbivore performance