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Using stable isotopes to understand hydrochemical processes in and around a Prairie Pothole wetland in the Northern Great Plains, USA



Using stable isotopes to understand hydrochemical processes in and around a Prairie Pothole wetland in the Northern Great Plains, USA



Applied Geochemistry 26.Suppl.



Millions of internally drained wetland systems in the Prairie Potholes region of the northern Great Plains (USA and Canada) provide indispensable habitat for waterfowl and a host of other ecosystem services. The hydrochemistry of these systems is complex and a crucial control on wetland function, flora and fauna. Wetland waters can have high concentrations of SO4(2-) due to the oxidation of large amounts of pyrite in glacial till that is in part derived from the Pierre shale. Water chemistry including delta18 O(H2O) , delta2 H(H2O) , and delta(34) S(SO4) values, was determined for groundwater, soil pore water, and wetland surface water in and around a discharge wetland in North Dakota. The isotopic data for the first time trace the interaction of processes that affect wetland chemistry, including open water evaporation, plant transpiration, and microbial SO4 reduction.

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Accession: 037197874

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DOI: 10.1016/j.apgeochem.2011.03.040


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