. The ecology of delta marshes of coastal Louisiana : a community profile. Marsh ecology -- Louisiana; Wetlands -- Louisiana. 1—I—I—r J F M A —I—r MONTHS -I—r A S 1—I—r O N D Figure 30. Seasonal salt marsh inundation patterns (Baumann 1980). also varies. duration of October when During this inundated more water depth over the marsh There is a sharp peak in flooding in September and water levels are highest, time the salt marshes are than 80 percent of the time Soil s As discussed in the previous section on changes in an aging delta lobe, the mineral content of marsh soil is directly related to
. The ecology of delta marshes of coastal Louisiana : a community profile. Marsh ecology -- Louisiana; Wetlands -- Louisiana. 1—I—I—r J F M A —I—r MONTHS -I—r A S 1—I—r O N D Figure 30. Seasonal salt marsh inundation patterns (Baumann 1980). also varies. duration of October when During this inundated more water depth over the marsh There is a sharp peak in flooding in September and water levels are highest, time the salt marshes are than 80 percent of the time Soil s As discussed in the previous section on changes in an aging delta lobe, the mineral content of marsh soil is directly related to the hydraulic energy of the system. In abandoned interdistributary environments this means that sediment delivery to the marsh decreases inland coast (Units III, IV, I, and VI 26) and also into the marsh from of local tidal streams (Figure frail the in Figure the edge 31). According to Baumann (1980), most of the sediment is deposited during frequent winter storms and rare summer tropical disturbances, probably by redistribution of sediment from bay bottoms (Figure 32). As expected, the sediment size fraction also varies with the hydraulic energy. There is hardly any sand in delta marshes, but the fraction of clays increases inland with decreasing hydraulic energy (Gosselink et al. 1977). Rates of sediment rather well known, both (Cs) profiles and from laid down on the surface time (Hatton 1981, Table deposition are from ^" Cesium marker horizons and tracked over 8). Streamside. 5 0 o o < o <A 5 10 15 20 DISTANCE FROM TIDAL STREAM (m) 5 0 Figure 31. Variation in soil density and soil carbon content with distance inland from the stream edge in a salt marsh in the Barataria basin (Buresh 1978). 2 a o < Streamside Inland SEASONS (1975-1978) W SU SP ? F SEASONS (1975-1979) Figure 32. Sedimentation rates on the Barataria saline marsh. (A) Mean seasonal sedimentation 1975 - 78. (B) Mean seasonal sedimentation 1975 - 79. Sedim
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