Mangroves may Salinize the Soil and in so Doing Limit Their Transpiration Rate

Passioura, J. B.; Ball, Marilyn C.; Knight, J. H.

doi:10.2307/2389286

Cited by 125 publications

(96 citation statements)

References 16 publications

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“…Indication of the origin of the water could be deduced from the 18 O isotopic data. The values for the Sinnamary piezometers are given in Table 1.…”

Section: Salinity and Isotopic Measurementsmentioning

confidence: 99%

“…Conductivity or salinity coupled with 18 O measurements are useful tools in the identification of water pools in wetlands. 1,[11][12][13] The oceans form the largest global water reservoir, and are the reference point for the isotopic standard of zero.…”

Section: Water Poolsmentioning

confidence: 99%

“…1 In French Guiana back mangroves, sand bars often separate two water pools: freshwater on the inland side with a conductivity of 40 to 250 mS, and salty water on the ocean side where mangroves develop with groundwater salinity that can reach two to three times the sea salinity during the dry season. The local freshwater pool is formed by the downstream Sinnamary River (d 18 O ¼ À1.6) and the coastal rainfall as seen by the Philippon Canal (d 18 O ¼ À1.4), which is a channeled small river that drains the local marsh (pri-pri). Compared with the upper Sinnamary River (d 18 O ¼ À2.7), 1 this fresh costal water is certainly evaporated after passing through the Petit Saut Dam, or after migration through the marsh.…”

Section: Water Poolsmentioning

confidence: 99%

“…The local freshwater pool is formed by the downstream Sinnamary River (d 18 O ¼ À1.6) and the coastal rainfall as seen by the Philippon Canal (d 18 O ¼ À1.4), which is a channeled small river that drains the local marsh (pri-pri). Compared with the upper Sinnamary River (d 18 O ¼ À2.7), 1 this fresh costal water is certainly evaporated after passing through the Petit Saut Dam, or after migration through the marsh. The amount of seawater coming from the Sinnamary estuary should, however, remain low as the conductivity does not excess 238 mS.…”

Section: Water Poolsmentioning

confidence: 99%

“…In addition, hydrological influences include inflow, outflow and the fraction of remaining water. In the d 2 H-d 18 O diagram, the trajectory of evaporating water bodies has a slope of 4 to 6, depending on these factors. We observed an evaporation line very close to the water mixing line, with a slope of around 6 (Fig.…”

Section: Saline Water Evaporationmentioning

confidence: 99%

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Mangrove trees growing in a very saline condition but not using seawater

Lambs

Muller

Fromard

2008

Rapid Comm Mass Spectrometry

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Mangrove trees, which develop along tropical coasts, are known to use saline water uptake. In French Guiana, the high salinity condition is the result of seawater evaporation on mud banks formed from the Amazon sediment flumes. In the back mangrove a few kilometres inland, groundwater, soil water and the xylem sap uptake in the trees remain highly salty, and only very tolerant plants like Avicennia germinans can flourish, whereas the less salt-tolerant Rhizophora mangle is more difficult to find. Curiously, the same Avicennia trees propagate on the seafront. However, stable isotope ratio mass spectrometry (IRMS) measurements and ion analysis (high-performance liquid chromatography (HPLC) and inductively coupled plasma atomic emission (ICP-AES) spectroscopy reveal that the origin of the water in the back mangrove is not seawater. It is freshwater percolating into the sand bars from the inland marshes and rainwater during the wet season that redissolves a marine evaporite and gives a saline groundwater. The absence of barren saltine areas ('tanne') in French Guiana could be explained by this freshwater inflow, the aquifer being no longer linked with the ocean.

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“…Indication of the origin of the water could be deduced from the 18 O isotopic data. The values for the Sinnamary piezometers are given in Table 1.…”

Section: Salinity and Isotopic Measurementsmentioning

confidence: 99%

Section: Water Poolsmentioning

confidence: 99%

Section: Water Poolsmentioning

confidence: 99%

Section: Water Poolsmentioning

confidence: 99%

Section: Saline Water Evaporationmentioning

confidence: 99%

See 3 more Smart Citations

Mangrove trees growing in a very saline condition but not using seawater

Lambs

Muller

Fromard

2008

Rapid Comm Mass Spectrometry

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Seasonal evapotranspiration patterns in mangrove forests

Barr¹,

DeLonge

Fuentes

2014

JGR Atmospheres

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Diurnal and seasonal controls on water vapor fluxes were investigated in a subtropical mangrove forest in Everglades National Park, Florida. Energy partitioning between sensible and latent heat fluxes was highly variable during the 2004-2005 study period. During the dry season, the mangrove forest behaved akin to a semiarid ecosystem as most of the available energy was partitioned into sensible heat, which gave Bowen ratio values exceeding 1.0 and minimum latent heat fluxes of 5 MJ d À1. In contrast, during the wet season the mangrove forest acted as a well-watered, broadleaved deciduous forest, with Bowen ratio values of 0.25 and latent heat fluxes reaching 18 MJ d À1. During the dry season, high salinity levels (> 30 parts per thousand, ppt) caused evapotranspiration to decline and correspondingly resulted in reduced canopy conductance. From multiple linear regression, daily average canopy conductance to water vapor declined with increasing salinity, vapor pressure deficit, and daily sums of solar irradiance but increased with air temperature and friction velocity. Using these relationships, appropriately modified Penman-Monteith and Priestley-Taylor models reliably reproduced seasonal trends in daily evapotranspiration. Such numerical models, using site-specific parameters, are crucial for constructing seasonal water budgets, constraining hydrological models, and driving regional climate models over mangrove forests.

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Plant Osmoregulation as an Emergent Water‐Saving Adaptation

Perri

Entekhabi

Molini

2018

Water Resources Research

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Soil salinity affects plant transpiration and growth through two main pathways: the osmotic effect of salt in the soil (osmotic stress; analogous to water stress) and the toxic effect of salt within the plant (ionic stress; salt specific). However, the drastic and sudden reduction of transpiration exhibited by most species in response to an increase of salinity in the root zone is mainly associated with the osmotic phase, while ionic stress appears at a later time, causing the premature senescence of leaves and the reduction of the plant photosynthetic area. To better investigate the effects of salinity on plant‐water relations, we introduce a parsimonious soil‐plant‐atmosphere continuum (SPAC) model accounting for both salt exclusion at the root level and osmoregulation—i.e., the adjustment of internal water potential in response to salt stress. The model is used to interpret a paradox observed in salt‐tolerant species where transpiration is maximum at an intermediate value of salinity ( CTr, max⁡), and is lower in more fresh ( CCTr, max⁡) conditions. Such nonmonotonic transpiration‐salt concentration ( Tr−C) patterns can be largely explained by plant osmoregulation, while the peak of transpiration at CTr, max⁡ tends to disappear over longer time scales, when ionic stress appears and morphological adaptations become predominant. Osmoregulation emerges here as a water‐saving behavior similar to the strategies that xerophytes use to cope with aridity. The maximum of transpiration at CTr, max⁡ is thus the result of a trade‐off between the enhancement of salt‐tolerance and optimal carbon assimilation.

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Mangroves may Salinize the Soil and in so Doing Limit Their Transpiration Rate

Cited by 125 publications

References 16 publications

Mangrove trees growing in a very saline condition but not using seawater

Mangrove trees growing in a very saline condition but not using seawater

Seasonal evapotranspiration patterns in mangrove forests

Plant Osmoregulation as an Emergent Water‐Saving Adaptation

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