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Trees; a powerful geomorphic agent governing the landscape evolution of a subtropical wetland
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|Authors:||Sullivan, Pamela L.; Price, René M.; Ross, Michael S.; Stoffella, Susana L.; Sah, Jay P.; Scinto, Leonard J.; Cline, Eric; Dreschel, Thomas W.; Sklar, Fred H.|
|Author Affiliations:||Primary: |
University of Kansas, Department of Geography and Atmospheric Science, Lawrence, KS, United States
Florida International University, United States
South Florida Water Management District, United States
|Volume Title:||Biogeochemistry (Dordrecht)|
|Source:||Biogeochemistry (Dordrecht), 128(3), p.369-384. Publisher: Springer, Dordrecht - Boston - Lancaster, International. ISSN: 0168-2563|
|Note:||In English. 43 refs.; illus., incl. 2 tables, sketch map|
|Summary:||Transpiration-driven ion accumulation in soil has been invoked as a biological and physical feedback mechanism in wetlands that governs topographic differences by regulating soil accretion-with greater transpiration, ion accumulation and soil accretion occurring on tree islands as compared to the surrounding marsh. The strength of this mechanism is hypothesized to be controlled by the ratio of evapotranspiration (ET) to precipitation (P), where under greater ET to P conditions soil accretion may move from organic to mineral in nature. We tested the existence of this mechanism on tree islands in a subtropical wetland, determined if it supports mineral soil formation, and assessed its control on the development of nutrient resource contrasts (tree islands-marsh). To test our hypotheses, biannual measurements of groundwater, surface water and aboveground biomass were made from 2007 to 2012. Water samples were analyzed for water isotopes, concentrations of major ions, and total and dissolved nutrients on constructed tree islands. We found that tree transpiration led to the advective movement of water and associated ions toward the center of the tree islands, supporting CaCO3 precipitation. CaCO3 accretion on the tree islands was estimated at roughly 1 mm per decade, and represented 5% of the total soil accretion since the islands' planting. We also observed depletion in groundwater nutrient concentrations as tree biomass accumulated, indicative of tight nutrient cycling. This work provides direct evidence that trees can act as powerful geomorphic agents in wetland systems, forming mineral soils that support landscape heterogeneity on time scales of centuries to millennia. Copyright 2016 Springer International Publishing Switzerland|
|Subjects:||Alkali metals; Alkaline earth metals; Aragonite; Biogenic processes; Biomass; Calcite; Calcium; Carbonate rocks; Carbonates; Chloride ion; Chlorine; Ground water; Halogens; Hydrologic cycle; Hydrology; Islands; Isotope ratios; Isotopes; Landform evolution; Limestone; Magnesium; Metals; O-18/O-16; Oxygen; Peat; Pedogenesis; Plantae; Public lands; Sedimentary rocks; Sediments; Sodium; Soils; Stable isotopes; Subtropical environment; Surface water; Trees; Water; Weathering; Wetlands; Atlantic Coastal Plain; Everglades; Florida; Palm Beach County Florida; United States; Boynton Beach Florida; Loxahatchee Impoundment Landscape Assessment; Loxahatchee National Wildlife Refuge; National wildlife refuges; Southeastern Florida; Transpiration; Tree islands|
|Coordinates:||N262100 N264300 W0800400 W0801400|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany|
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