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Assessment of Anion Retention within Variable-Charged Eastern-Central Adirondack Forest Sub-Soils

Mon, 12/05/2011 - 10:20
Abstract: Anthropogenic influences such as acid deposition and road salting have caused shifts in both the pools and fluxes of nutrients within Earth’s biogeochemical cycles. The mobility of ions within forest soils is a very well documented concept; however the significant mechanisms affecting these patterns are poorly understood. One mechanism affecting anion retention is the electrostatic attraction to soil colloid surfaces, which is poorly documented in the Adirondack Park. Soils were sampled from both glacial till and outwash sites with predominantly deciduous canopies. The amount of anion retention was documented through multiple soil ion extractions over a pH gradient from 2 to 9. A loss on ignition procedure was used to understand the relationship between both organic matter or Fe/Al oxides and the overall soil surface charge. The estimated retention of Cl- and NO3- is 252 Kg/Ha and 440 Kg/Ha, respectively. Using hypothetical watersheds, we calculated that it will take 14 years to saturate the subsoil with NO3- and only 7 years to saturate with Cl-. These results suggest that the effects of acid deposition may be seen up to 14 years even after deposition has ceased. The relatively limited retention of Cl- however, may explain increased salinization of freshwater ecosystems.
Access: Yes
Literary Rights: Off
Major: Fisheries and Wildlife Science
Year: 2011
File Attachments: Capstone Final Paper.docx
Authors: John Mullins