The effect of tidally induced changes in the creekbank water table on pore water chemistry

Agosta, Kathleen

doi:10.1016/0272-7714(85)90019-8

Cited by 64 publications

(46 citation statements)

References 15 publications

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“…In very finegrained soils, capillary action can saturate soil above the water table (Fetter 1988), and, as noted, soil in the marsh interior often remains saturated to near the surface in spite of tidal drainage of creeks (Agosta 1985).…”

Section: Discussionmentioning

confidence: 89%

“…If marsh soils in the field could similarly drain, this process could be important in oxidizing reduced compounds that may accumulate in marsh soils throughout the growing season (Feijtel et al 1988). This process might be important only in the streamside zone, however, because there is little soil drainage more than 4 m from streamside (Agosta 1985).…”

Section: Discussionmentioning

confidence: 99%

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CO²emission and soil Eh responses to different hydrological conditions in fresh, brackish, and saline marsh soils

Nyman

DeLaune

1991

Limnology & Oceanography

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The effects of various water-table depths during continuous and simulated tidal drainage on CO, emissions and soil Eh were examined in intact fresh, brackish, and saline marsh soil cores. CO, emissions did not differ between continuous and tidal drainage. CO, emissions were greatest in fresh cores and least in brackish cores at all water-table depths tested. Eh was higher in brackish cores and lower in fresh and saline cores at all water-table depths tested. Eh increased with decreasing water-table depth and increased more during continuous drainage than during tidal drainage. These results exclude the possibility that reported differences in field measurements of CO, emission among fresh, brackish, and saline marsh soils relate to different hydrological conditions in the marsh types; they also mdicate that fundamental differences in decomposition processes and soil Eh exist among these marsh types. Although not tested, differences were attributed to the different species of emergent vegetation occupying the different marsh types and which arc the sources of soil organic matter.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

CO²emission and soil Eh responses to different hydrological conditions in fresh, brackish, and saline marsh soils

Nyman

DeLaune

1991

Limnology & Oceanography

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“…Most salt marsh groundwater modeling has examined two-dimensional domains that are vertical slices perpendicular to major tidal channels (2-D-XZ models). Empirical investigations of groundwater flow and transport have also focused on this 2-D-XZ geometry [Chapman, 1938a;Agosta, 1985;Harvey and Odum, 1990;Howes and Goehringer, 1994;Hayden et al, 1995;Osgood and Zieman, 1998;Montalto et al, 2006]. Few models or experiments have examined lateral (2-D-XY) or three-dimensional (3-D) salt marsh groundwater hydrology.…”

Section: Review Of Literature On Intertidal Salt Marsh Groundwater Momentioning

confidence: 99%

Salt marsh ecohydrological zonation due to heterogeneous vegetation–groundwater–surface water interactions

Moffett¹,

Gorelick²,

McLaren³

et al. 2012

Water Resources Research

112

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[1] Vegetation zonation and tidal hydrology are basic attributes of intertidal salt marshes, but specific links among vegetation zonation, plant water use, and spatiotemporally dynamic hydrology have eluded thorough characterization. We developed a quantitative model of an intensively studied salt marsh field site, integrating coupled 2-D surface water and 3-D groundwater flow and zonal plant water use. Comparison of model scenarios with and without heterogeneity in (1) evapotranspiration rates and rooting depths, according to mapped vegetation zonation, and (2) sediment hydraulic properties from inferred geological heterogeneity revealed the coupled importance of both sources of ecohydrological variability at the site. Complex spatial variations in root zone pressure heads, saturations, and vertical groundwater velocities emerged in the model but only when both sources of ecohydrological variability were represented together and with tidal dynamics. These regions of distinctive root zone hydraulic conditions, caused by the intersection of vegetation and sediment spatial patterns, were termed ''ecohydrological zones'' (EHZ). Five EHZ emerged from different combinations of sediment hydraulic properties and evapotranspiration rates, and two EHZ emerged from local topography. Simulated pressure heads and groundwater dynamics among the EHZ were validated with field data. The model and data showed that hydraulic differences between EHZ were masked shortly after a flooding tide but again became prominent during prolonged marsh exposure. We suggest that ecohydrological zones, which reflect the combined influences of topographic, sediment, and vegetation heterogeneity and do not emphasize one influence over the others, are the fundamental spatial habitat units comprising the salt marsh ecosystem.

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“…Biogeochemical cycling in each of these subsystems is probably quite diverse, and their separate roles in controlling overall import-export characteristics have received little attention. A few studies have attempted to identify and quantify exchanges between the vegetated portion of the marsh and the adjacent tidal creeks (Agosta 1985;Jordan and Correll 1985;Lee 1979;Welsh 1980;Wolaver et al 1983).…”

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confidence: 99%

Nitrogen exchange between a portion of vegetated salt marsh and the adjoining creek

Whiting

McKellar

Spurrier

et al. 1989

Limnology & Oceanography

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We measured net exchange of nitrogen between a portion of vegetated salt marsh (dominated by Spartina alterniflora) and the adjacent tidal creek. During tidal inundation, the marsh imported ammonium, nitrate + nitrite, and particulate nitrogen and exported dissolved organic nitrogen over an annual cycle. The low marsh (characterized by the tall form of S. alterniflora) had higher uptake and release rates compared to high marsh areas dominated by shorter forms of S. alterniflora. When creek‐water levels were below the marsh surface during the late ebb and early flood, residual water on the marsh surface drained into the tidal creek and exported substantial amounts of particulate and dissolved organic nitrogen but relatively small amounts of dissolved inorganic nitrogen. Rainfall during exposure of the marsh surface increased particulate nitrogen export to the tidal creek 40‐fold. With respect to tidal exchange via inundation and drainage, the vegetated marsh exported ~4.5 g N m−2 yr−1, largely as dissolved organic nitrogen.

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The effect of tidally induced changes in the creekbank water table on pore water chemistry

Cited by 64 publications

References 15 publications

CO²emission and soil Eh responses to different hydrological conditions in fresh, brackish, and saline marsh soils

CO²emission and soil Eh responses to different hydrological conditions in fresh, brackish, and saline marsh soils

Salt marsh ecohydrological zonation due to heterogeneous vegetation–groundwater–surface water interactions

Nitrogen exchange between a portion of vegetated salt marsh and the adjoining creek

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The effect of tidally induced changes in the creekbank water table on pore water chemistry

Cited by 64 publications

References 15 publications

CO2emission and soil Eh responses to different hydrological conditions in fresh, brackish, and saline marsh soils

CO2emission and soil Eh responses to different hydrological conditions in fresh, brackish, and saline marsh soils

Salt marsh ecohydrological zonation due to heterogeneous vegetation–groundwater–surface water interactions

Nitrogen exchange between a portion of vegetated salt marsh and the adjoining creek

Contact Info

Product

Resources

About

CO²emission and soil Eh responses to different hydrological conditions in fresh, brackish, and saline marsh soils

CO²emission and soil Eh responses to different hydrological conditions in fresh, brackish, and saline marsh soils