Estimation of real evapotranspiration and its variation in Mediterranean landscapes of central-southern Chile
Author
dc.contributor.author
Olivera Guerra, L.
Author
dc.contributor.author
Mattar Bader, Cristián
es_CL
Author
dc.contributor.author
Galleguillos, M.
Admission date
dc.date.accessioned
2014-12-24T14:30:53Z
Available date
dc.date.available
2014-12-24T14:30:53Z
Publication date
dc.date.issued
2014
Cita de ítem
dc.identifier.citation
International Journal of Applied Earth Observation and Geoinformation 28 (2014) 160–169
en_US
Identifier
dc.identifier.other
DOI: 10.1016/j.jag.2013.11.012
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/120261
General note
dc.description
Artículo de publicación ISI
en_US
Abstract
dc.description.abstract
Evapotranspiration (ETd) is a key controller in the ecohydrological processes of semi-arid landscapes.
This is the case of the dry land in Chile’s central-southern zone, where forestry, farming and livestock
activities must adapt to precipitation with considerable year-on-year variations. In this study, the spatial
distribution of ETd was estimated in relation to the land use map and physical parameters of the soil.
The ETd was estimated through the Simplified Surface Energy Balance Index (S-SEBI) using data from
weather stations and remote data provided by the ASTER and MODIS sensors for November 2004 and
2006, respectively. The spatial variability of ETd was compared among different plant types, soil textural
classes and depths using non-parametric statistical tests. In this comparison, the highest rates of ETd were
obtained in the forest covers with values of 7.3
±
0.8 and 8.4
±
0.8 mm d−1 for 2004 and 2006, respectively.
The lowest values were estimated for pastures and shrublands with values of 3.5
±
1.2 mm d−1 and for
crops with rates of 4.4
±
1.6 mm d−1. Comparison of the ETd of the native forest covers and plantations of
exotic species showed statistically significant differences; however, no great variation was noted, at least
in the study months. Additionally, the highest rates of ETd were found in the clay loam textures (6.0
±
1.8
and 6.4
±
2.0 mm d−1) and the lowest rates in the sandy loam soils (3.7
±
1.6 and 3.9
±
1.6 mm d−1) for
2004 and 2006, respectively. The results enable analysis of the spatial patterns of the landscape in terms
of the relation between water consumption, ET and the biophysical characteristics of a Mediterranean
ecosystem. These results form part of the creation of tools useful in the optimization of decision-making
for the management and planning of water resources and soil use in territories with few measuring
instruments.
en_US
Patrocinador
dc.description.sponsorship
This work was partially funded by Program U-INICIA VID 2012,
grant U-INICIA 4/0612; University of Chile and the CONICYT project,
Integration of Advanced Human Capital into the Academy, code
791100013.