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Variations in water use by a mature mangrove of Avicennia germinans, French Guiana

Muller, Etienne and Lambs, Luc and Fromard, François Variations in water use by a mature mangrove of Avicennia germinans, French Guiana. (2009) Annals of Forest Science, vol. 66 (n° 8). pp. 1-10. ISSN 1286-4560

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Official URL: http://dx.doi.org/10.1051/forest/2009079

Abstract

In the tropical intertidal zones, little is known on water uptake by mangroves. Transpiration rates are generally measured at leaf level, but few studies exist on water use at tree or stand levels. The objective of this study was to measure sap flow in trees of different sizes to appreciate the range of variation in water use that may exist in a site dominated by 80% mature Avicennia germinans. The results showed that from the dry to the wet season the mean water use increased from 3.2 to 5.3 dm3 d−1 in small trees (DBH ∼ 13 cm), from 11.5 to 30.8 dm3 d−1 in medium trees (∼24 cm) and from 40.8 to 64.1 dm3 d−1 in large ones (∼45 cm). Sapwood remained active up to a depth of 8 cm with radial variations within the stem. Weak correlations were obtained with VPD and net radiation. This study confirmed that transpiration was larger under low levels of salinity. Water use at stand level (∼1900 living stems ha−1) was estimated to be in the range of 5.8 to 11.8 m3 ha−1 d−1 according to the season.

Item Type:Article
Additional Information:Thanks to EDP Sciences editor. The definitive version is available at http://www.afs-journal.org The original PDF of the article can be found at Annals of Forest Science website : http://www.afs-journal.org/index.php?option=com_article&access=doi&doi=10.1051/forest/2009079&Itemid=129
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Florence Amor

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