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Silva, B.; &Aacute;lava-N&uacute;&ntilde;ez, P.; Strobl, S.; Beck, E. &amp; Bendix, J. (2017): <b>Area-wide evapotranspirationmonitoring at the crown level of a tropical mountain rain forest</b>. <i>Remote Sensing of Environment </i> <b>194</b>( ), 219-229<br>DOI: <a href="http://dx.doi.org/10.1016/j.rse.2017.03.023" target="_blank">http://dx.doi.org/10.1016/j.rse.2017.03.023</a>.

Resource Description

Title: Area-wide evapotranspirationmonitoring at the crown level of a tropical mountain rain forest
FOR816dw ID: 1563
Publication Date: 2017-03-01
License and Usage Rights: PAK 823-825 data user agreement. (www.tropicalmountainforest.org/dataagreementp3.do)
Resource Owner(s):
Individual: Brenner Silva
Contact:
Individual: Paulina Álava-Núñez
Contact:
Individual: Simone Strobl
Contact:
Individual: Erwin Beck
Contact:
Individual: Jörg Bendix
Contact:
Abstract:
Ecosystem water regulation couples energy and water balance, depends on the integrity of the ecosystem, and<br/> responds to changes in climate. Changes in tree-water relationships in the biodiversity hotspot of the tropical<br/> Andes in southern Ecuador might be potentially observed at the level of individual trees, thus providing an ef?-<br/> cient ecosystem monitoring method with applications in forest management and conservation at the tree and<br/> landscape levels. In this study,we combine area-averagemeasurements froma laser scintillometer above the for-<br/> est with optical satellite data at high spatial resolution to obtain area-wide evapotranspiration data. The process-<br/> ing of ?eld data includes the calculation of energy storage in forest biomass and the partitioning of<br/> evapotranspiration into transpiration and evaporation. Satellite-based estimates are calibrated by using tower<br/> ?ux measurements and meteorological data within periods of humid and less-humid atmosphere. The annual<br/> evapotranspiration was 1316 mm, of which 1086 mm per year corresponds to the forest transpiration at the<br/> study site. Average values of 4.7 and 4.1 mm d?1<br/> per tree crown are observed under humid and less-humid at-<br/> mospheric conditions, respectively, when applying high-resolution area-wide evapotranspiration in individual<br/> crown analysis. Approximately 24% of the observed crowns show a positive monthly change in ET, and 51% of<br/> the crowns show a signi?cant change in the daily ET, which can be considered sensitive individuals concerning<br/> water relationships. The limitations in the area-wide evapotranspiration at the crown level can be explained<br/> by considering the spectral responses of the crown individuals. The presented method can be robustly deployed<br/> in the ecological monitoring of mountain forests.
Keywords:
| remote sensing | Evapotranspiration | crown scale |
Literature type specific fields:
ARTICLE
Journal: Remote Sensing of Environment
Volume: 194
Page Range: 219-229
Metadata Provider:
Individual: Jörg Bendix
Contact:
Online Distribution:
Download File: http://www.lcrs.de/publications.do?citid=1563


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