Mudflats and mud suspension observed from satellite data in French Guiana

Froidefond, Jean-Marie; Lahet, Florence; Hu, C.; Doxaran, David; Guiral, Daniel; Prost, M.; Ternon, Jean-François

doi:10.1016/j.margeo.2004.04.025

Cited by 44 publications

(23 citation statements)

References 25 publications

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“…The Grand Macoua savanna is one of a narrow band of low-lying, seasonally flooded savannas situated parallel to the coast from west of Cayenne to the Mana River. These savannas occur in basins characterized by clayrich soils developed on late Quaternary marine sediments (Froidefond et al 2004;Prost 1989). These basins are bounded on the north and south by elevated cheniers (beach ridges, remnants of late Quaternary marine high-stands, rising three to five meters above the floor of the basins).…”

Section: Study Sitementioning

confidence: 99%

Origin of mound-field landscapes: a multi-proxy approach combining contemporary vegetation, carbon stable isotopes and phytoliths

et al. 2011

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Background and aims Seasonally flooded South American savannas harbor different kinds of mound-field landscapes of largely unknown origin. A recent study used soil carbon-isotope depth profiles and other proxies to infer vegetation history in murundu landscapes in Brazil. Results suggested that differential erosion, not building-up processes (e.g., termite mounds), produced mounds. We tested this approach to inferring mound origin in a mound-field landscape in French Guiana. Methods We examined carbon-isotope depth profiles of soil organic matter, phytolith profiles and contemporary vegetation composition in mounds and inter-mounds.Results Relative abundance of C3 and C4 plants across habitats was very different from that in murundu landscapes; C3 plants were better represented in inter-mounds than on mounds. Habitat differences in C3/C4 distribution were subtler than in murundu landscapes, limiting inference of vegetation history based on carbon isotopes. Still, carbon-isotope and phytolith depth profiles gave similar pictures of vegetation history, both favoring a building-up hypothesis, corroborating other evidence that these mounds are vestiges of ancient agricultural raised fields. Conclusions Carbon-isotope depth profiles are unlikely to be adequate for deciphering origin of mound-field landscapes from vegetation history in Plant Soil (2012) 351:337-353

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Section: Study Sitementioning

confidence: 99%

Origin of mound-field landscapes: a multi-proxy approach combining contemporary vegetation, carbon stable isotopes and phytoliths

et al. 2011

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“…Remote sensing images of mangroves are for the most part reliable (Pham et al 1992), accurate (Kovacs et al 2004, Plaziat andAugustinus 2004) and collected consistently in time and space (Green et al 1997). Furthermore, the information can be obtained very quickly, almost in near real time (Blasco et al 1996, Green et al 1997, Froidefond et al 2004. Other benefits of using remote sensing for mangrove mapping are that data can be collected in a non-destructive manner since it is not necessary to move around in the mangrove to obtain data (Green et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Using remote sensing to assess the protective role of coastal woody vegetation against tsunami waves

Olwig

Sørensen

Rasmussen

et al. 2007

International Journal of Remote Sensing

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This paper describes how remote sensing techniques were used to study the effect of mangroves and other woody coastal vegetation as a protective measure against the 2004 Indian Ocean Tsunami. Remote sensing made it possible to compare pre-and post-Tsunami images of large areas. A study site was selected based on medium resolution Landsat imagery and existing topographic maps. Selection criteria included substantial damages reported, presence of woody vegetated and non-vegetated shorelines, homogeneous bathymetry and good coverage of preand post-Tsunami satellite imagery. The Pichawaram mangrove, Tamil Nadu, India, matched these criteria. Pre-and post-Tsunami Ikonos and QuickBird images were compared through the visual interpretation of pre-Tsunami coastal vegetation and post-Tsunami damage. The results were validated in the field. The analysis showed that mangrove forests and coastal shelterbelts provided protection from the Tsunami. This was concluded from analysing the spatial distribution of damage relative to woody vegetation along the coast as well as transects detailing the amount of damage behind the coastline and the coastal woody vegetation.

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“…About 20% of the enormous mud supply of the Amazon is deflected north-west towards this coast due to oblique wave approach Froidefond et al, 2004). The particulate flux is transported in shoreface-attached and subtidal mudbanks, thus creating the longest mud coastline in the world, from Brazil to Venezuela.…”

Section: Introductionmentioning

confidence: 99%

Variations de la consommation d’eau d’une mangrove adulte à Avicennia germinans, en Guyane française

2009

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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 dm 3 d −1 in small trees (DBH ∼ 13 cm), from 11.5 to 30.8 dm 3 d −1 in medium trees (∼24 cm) and from 40.8 to 64.1 dm 3 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 m 3 ha −1 d −1 according to the season. • Dans les zones intertidales tropicales, des taux de transpiration sont généralement mesurés au niveau des feuilles, mais il existe peu d'études sur la consommation d'eau à l'échelle de l'arbre ou de la parcelle. Mots• L'objectif de cette étude était de mesurer les flux de sève dans des arbres de différentes tailles pour apprécier la gamme de variation de la consommation d'eau qui peut exister dans un site dominé à 80 % par des Avicennia germinans adultes.• Les résultats montrent que la consommation moyenne d'eau, entre une saison sèche et humide, augmente de 3.2 à 5.3 dm 3 jour −1 chez les petits arbres (DHP ∼13 cm), de 11.5 à 30.8 dm 3 jour −1 chez les arbres moyens (∼24 cm) et de 40.8 à 64.1 dm 3 jour −1 chez les plus gros (∼45 cm).• L'aubier restait actif jusqu'à une profondeur de 8 cm avec des variations radiales dans le tronc. Les corrélations avec le DPV ou le rayonnement se sont révélées globalement faibles.• Cette étude confirme que les mangroves transpirent plus avec des salinités faibles et indique qu'au niveau de la parcelle (∼1900 pieds vivants ha −1 ) la consommation d'eau varie de 5.8 à 11.8 m 3 ha −1 jour −1 selon la saison.

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Mudflats and mud suspension observed from satellite data in French Guiana

Cited by 44 publications

References 25 publications

Origin of mound-field landscapes: a multi-proxy approach combining contemporary vegetation, carbon stable isotopes and phytoliths

Origin of mound-field landscapes: a multi-proxy approach combining contemporary vegetation, carbon stable isotopes and phytoliths

Using remote sensing to assess the protective role of coastal woody vegetation against tsunami waves

Variations de la consommation d’eau d’une mangrove adulte à Avicennia germinans, en Guyane française

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