Fog reduces transpiration in tree species of the Canarian relict heath-laurel cloud forest (Garajonay National Park, Spain)
The ecophysiologic role of fog in the evergreen heath-laurel laurisilva cloud forests of the Canary Islands has not been unequivocally demonstrated, although it is generally assumed that fog water is important for the survival and the distribution of this relict paleoecosystem of the North Atlanti...
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2009
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fthighwire:oai:open-archive.highwire.org:treephys:29/4/517 2023-05-15T17:36:00+02:00 Fog reduces transpiration in tree species of the Canarian relict heath-laurel cloud forest (Garajonay National Park, Spain) Ritter, Axel Regalado, Carlos M. Aschan, Guido 2009-04-01 00:00:00.0 text/html http://treephys.oxfordjournals.org/cgi/content/short/29/4/517 https://doi.org/10.1093/treephys/tpn043 en eng Oxford University Press http://treephys.oxfordjournals.org/cgi/content/short/29/4/517 http://dx.doi.org/10.1093/treephys/tpn043 Copyright (C) 2009, Oxford University Press Article TEXT 2009 fthighwire https://doi.org/10.1093/treephys/tpn043 2009-03-30T07:49:34Z The ecophysiologic role of fog in the evergreen heath-laurel laurisilva cloud forests of the Canary Islands has not been unequivocally demonstrated, although it is generally assumed that fog water is important for the survival and the distribution of this relict paleoecosystem of the North Atlantic Macaronesian archipelagos. To determine the role of fog in this ecosystem, we combined direct transpiration measurements of heath-laurel tree species, obtained with Graniers heat dissipation probes, with micrometeorological and artificial fog collection measurements carried out in a 43.7-ha watershed located in the Garajonay National Park (La Gomera, Canary Islands, Spain) over a 10-month period. Median ambient temperature spanned from 7 to 15 °C under foggy conditions whereas higher values, ranging from 9 to 21 °C, were registered during fog-free periods. Additionally, during the periods when fog water was collected, global solar radiation values were linearly related ( r 2 = 0.831) to those under fog-free conditions, such that there was a 75 ± 1% reduction in median radiation in response to fog. Fog events greatly reduced median diurnal tree transpiration, with rates about 30 times lower than that during fog-free conditions and approximating the nighttime rates in both species studied (the needle-like leaf Erica arborea L. and the broadleaf Myrica faya Ait.). This large decrease in transpiration in response to fog was independent of the time of the day, tree size and species and micrometeorological status, both when expressed on a median basis and in cumulative terms for the entire 10-month measuring period. We conclude that, in contrast to the turbulent deposition of fog water droplets on the heath-laurel species, which may be regarded as a localized hydrological phenomenon that is important for high-altitude wind-exposed E . arborea trees, the cooler, wetter and shaded microenvironment provided by the cloud immersion belt represents a large-scale effect that is crucial for reducing the transpirational water ... Text North Atlantic HighWire Press (Stanford University) The Needle ENVELOPE(-64.047,-64.047,63.267,63.267) Tree Physiology 29 4 517 528 |
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HighWire Press (Stanford University) |
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English |
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Article Ritter, Axel Regalado, Carlos M. Aschan, Guido Fog reduces transpiration in tree species of the Canarian relict heath-laurel cloud forest (Garajonay National Park, Spain) |
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Article |
description |
The ecophysiologic role of fog in the evergreen heath-laurel laurisilva cloud forests of the Canary Islands has not been unequivocally demonstrated, although it is generally assumed that fog water is important for the survival and the distribution of this relict paleoecosystem of the North Atlantic Macaronesian archipelagos. To determine the role of fog in this ecosystem, we combined direct transpiration measurements of heath-laurel tree species, obtained with Graniers heat dissipation probes, with micrometeorological and artificial fog collection measurements carried out in a 43.7-ha watershed located in the Garajonay National Park (La Gomera, Canary Islands, Spain) over a 10-month period. Median ambient temperature spanned from 7 to 15 °C under foggy conditions whereas higher values, ranging from 9 to 21 °C, were registered during fog-free periods. Additionally, during the periods when fog water was collected, global solar radiation values were linearly related ( r 2 = 0.831) to those under fog-free conditions, such that there was a 75 ± 1% reduction in median radiation in response to fog. Fog events greatly reduced median diurnal tree transpiration, with rates about 30 times lower than that during fog-free conditions and approximating the nighttime rates in both species studied (the needle-like leaf Erica arborea L. and the broadleaf Myrica faya Ait.). This large decrease in transpiration in response to fog was independent of the time of the day, tree size and species and micrometeorological status, both when expressed on a median basis and in cumulative terms for the entire 10-month measuring period. We conclude that, in contrast to the turbulent deposition of fog water droplets on the heath-laurel species, which may be regarded as a localized hydrological phenomenon that is important for high-altitude wind-exposed E . arborea trees, the cooler, wetter and shaded microenvironment provided by the cloud immersion belt represents a large-scale effect that is crucial for reducing the transpirational water ... |
format |
Text |
author |
Ritter, Axel Regalado, Carlos M. Aschan, Guido |
author_facet |
Ritter, Axel Regalado, Carlos M. Aschan, Guido |
author_sort |
Ritter, Axel |
title |
Fog reduces transpiration in tree species of the Canarian relict heath-laurel cloud forest (Garajonay National Park, Spain) |
title_short |
Fog reduces transpiration in tree species of the Canarian relict heath-laurel cloud forest (Garajonay National Park, Spain) |
title_full |
Fog reduces transpiration in tree species of the Canarian relict heath-laurel cloud forest (Garajonay National Park, Spain) |
title_fullStr |
Fog reduces transpiration in tree species of the Canarian relict heath-laurel cloud forest (Garajonay National Park, Spain) |
title_full_unstemmed |
Fog reduces transpiration in tree species of the Canarian relict heath-laurel cloud forest (Garajonay National Park, Spain) |
title_sort |
fog reduces transpiration in tree species of the canarian relict heath-laurel cloud forest (garajonay national park, spain) |
publisher |
Oxford University Press |
publishDate |
2009 |
url |
http://treephys.oxfordjournals.org/cgi/content/short/29/4/517 https://doi.org/10.1093/treephys/tpn043 |
long_lat |
ENVELOPE(-64.047,-64.047,63.267,63.267) |
geographic |
The Needle |
geographic_facet |
The Needle |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://treephys.oxfordjournals.org/cgi/content/short/29/4/517 http://dx.doi.org/10.1093/treephys/tpn043 |
op_rights |
Copyright (C) 2009, Oxford University Press |
op_doi |
https://doi.org/10.1093/treephys/tpn043 |
container_title |
Tree Physiology |
container_volume |
29 |
container_issue |
4 |
container_start_page |
517 |
op_container_end_page |
528 |
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1766135337252290560 |