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Patterns and controls of above‐ground net primary production in meadows of Patagonia. A remote sensing approach

Irisarri, Jorge Gonzalo Nicolás et al · Wiley Blackwell Publishing, Inc · 2011

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Questions: (1) Can above-ground net primary production (ANPP) of Patagonian meadows be estimated from remote sensing? (2) How does ANPP of Patagonian meadows change in space and time? Location: Northwestern Patagonia, meadows embedded in a steppe matrix (39?43°S, 70?72ºW; area: 85 000 km2). Methods: For the first question, we contrasted field ANPP measurements with MODIS high-spatial resolution (pixel size: 0.0625 km2) data and developed a model that estimates radiation use efficiency. For the second question, we applied the model to a 6-year MODIS record for 14 meadows whose physiognomic heterogeneity was known from previous work. Results: Up to 77% of the field-based ANPP variation was accounted for by the absorbed photosynthetic radiation, based on a linear transformation of the normalized difference vegetation index derived from MODIS data. Mean radiation use efficiency was 0.54 g dry matter MJ−1. ANPP ranged between 610 and 1060 g m−2 year−1, which represents three to 5.3 times the ANPP of the surrounding arid and semi-arid steppes. The inter-annual coefficient of variation of ANPP was 10%, which is higher than other systems of similar productivity, but much lower than the surrounding steppes (33%). At the level of management units (paddock), ANPP spatial variations were mainly related to the proportion of Prairies, a proxy for low topographic position in the landscape, and longitude, a proxy for precipitation. ANPP inter-annual variation was most related to latitude, a proxy for temperature. Conclusion: The model developed and tested can be used to infer ANPP from remote sensing data at a spatial resolution that allows one to detect variability within meadows and management units. Variations at both the physiognomic unit and paddock level were associated with geographic patterns and topography. Meadows were three to five times more productive and less fluctuating than nearby steppes. When compared with other ecosystems, their productivity was high, but more variable inter-annually, likely due to exceptionally high variability of precipitation in Patagonia.
Fil: Irisarri, Jorge Gonzalo Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina
Fil: Oesterheld, Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina

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APA 7

Irisarri, J. G. N. E. A. (2011). Patterns and controls of above‐ground net primary production in meadows of Patagonia. A remote sensing approach. http://hdl.handle.net/11336/269649

MLA

Irisarri, Jorge Gonzalo Nicolás et al. "Patterns and controls of above‐ground net primary production in meadows of Patagonia. A remote sensing approach." 2011. http://hdl.handle.net/11336/269649.

Chicago

Irisarri, Jorge Gonzalo Nicolás et al. 2011. "Patterns and controls of above‐ground net primary production in meadows of Patagonia. A remote sensing approach.". http://hdl.handle.net/11336/269649.

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Irisarri, J. G. N. E. A. 2011, Patterns and controls of above‐ground net primary production in meadows of Patagonia. A remote sensing approach, Wiley Blackwell Publishing, Inc, available at: http://hdl.handle.net/11336/269649 [Accessed 28 Jun. 2026].

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Título
Patterns and controls of above‐ground net primary production in meadows of Patagonia. A remote sensing approach
Autor / colaboradores
Irisarri, Jorge Gonzalo Nicolás et al
Editorial
Wiley Blackwell Publishing, Inc
Año de publicación
2011
ISSN
1100-9233
ISSN
1100-9233
Idioma
eng

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