Decadal Changes of Soil Physiochemical Properties in A Freshwater Wetland After Hydrologic Reconnection

Temporal variability in soil organic matter accretion rates in coastal deltaic wetlands under changing depositional environments

“…This finding is consistent with the presence of a small amount of mineral matter at this depth range (100–150 cm) indicating a lack of river influence. The marshes below the depth of 150 cm depth had N sources similar to the core surface with increasing δ 15 N signatures with depth indicating the possibility of the N supply from the river (Spera, 2019). This finding is supported by the increasing mineral matter content below 150 cm depth, which is also indicative of increased river influence (Spera et al., 2020).…”

“…( White et al, 2023). Studies of Mississippi river diversions on Davis Pond and Breton Sound basins in southeastern Louisiana have shown that the wetland soil δ 15 N decreases with increasing distance from the river input at the site of the river connection (DeLaune et al, 2008;Spera, 2019). In addition, radioisotope dating (e.g., 137 Cs, 14 C) provides timeaveraged vertical accretion rates.…”

“…Due to leveed and highly controlled river flow, the coastal wetlands either directly receive river water through engineered freshwater and sediment diversions or after getting diluted with ocean water as waves and tides interact with salt marshes (White et al, 2023). Studies of Mississippi river diversions on Davis Pond and Breton Sound basins in southeastern Louisiana have shown that the wetland soil δ 15 N decreases with increasing distance from the river input at the site of the river connection (DeLaune et al., 2008; Spera, 2019). In addition, radioisotope dating (e.g., 137 Cs, 14 C) provides time‐averaged vertical accretion rates.…”