 |
| Titel |
Application of Vegetation Indices to Estimate Acorn Production at Iberian Peninsula |
| VerfasserIn |
Juan A. Escribano, Carlos G. H. Díaz-Ambrona, Laura Recuero, Margarita Huesca, Víctor Cicuéndez, Alicia Palacios, Ana M. Tarquis |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100459
|
| Publikation (Nr.) |
 EGU/EGU2014-16428.pdf |
|
|
|
|
|
| Zusammenfassung |
| The Iberian pig valued natural resources of the pasture when fattened in mountain. The
variability of acorn production is not contained in any line of Spanish agricultural insurance.
However, the production of arable pasture is covered by line insurance number 133 for loss of
pasture compensation. This scenario is only contemplated for breeding cows and brave bulls,
sheep, goats and horses, although pigs are not included. This insurance is established by
monitoring ten-day composites Normalized Difference Vegetation Index (NDVI) measured
by satellite over treeless pastures, using MODIS TERRA satellite. The aim of this work is
to check if we can use a satellite vegetation index to estimate the production of
acorns.
In order to do so, two Spanish grassland locations have been analyzed: regions of
Olivenza (Jerez-Oliva) and Merida (Badajoz). The acorns production was evaluated through
2002-2005 gauging conducted by the Grupo Habitat de la Orden (Badajoz). Medium
resolution (500x500 m2) MODIS images were used during the same time period to estimate
the ten-day composites NDVI at these locations. Finally, meteorological data was obtained
from SIAR and MAGRAMA network stations, calculating the ten-day averaged temperature
and ten day accumulated precipitation.
Considering two accumulated factors, NDVI and temperature, three phenological stages
were well defined being the second one which pointed differences among campaigns. Then,
accumulated precipitation versus accumulated NDVI was plot for this second phenological
stage obtaining maximum differences at 300 mm of cumulative rainfall. Analyzing acorn
production with accumulated NDVI in that moment a production function was
obtained with a correlation coefficient of 0.71. These results will be discussed in
detail.
References
J.A. Escribano, C.G.H. Diaz-Ambrona, L. Recuero, M. Huesca, V. Cicuendez, A.
Palacios-Orueta y A.M. Tarquis. Aplicacion de Indices de Vegetacion para evaluar la falta de
produccion de pastos y montaneras en dehesas. I Congreso Iberico de la Dehesa y el
Montado. 6-7 Noviembre, 2013, Badajoz.
J.A. Escribano Rodriguez, A.M. Tarquis, C.G. Hernandez Diaz-Ambrona. Pasture
Drought Insurance Based on NDVI and SAVI. Geophysical Research Abstracts, 14,
EGU2012-13945, 2012. EGU General Assembly 2012.
Juan Escribano Rodriguez, Carmelo Alonso, Ana Maria Tarquis, Rosa Maria Benito,
Carlos Hernandez Diaz-Ambrona. Comparison of NDVI ?elds obtained from different remote
sensors. Geophysical Research Abstracts, 15, EGU2013-14153, 2013. EGU General
Assembly 2013
Acknowledgements. This work was partially supported by ENESA under project P10
0220C-823. |
|
|
|
|
|
|