SS3.04 Biogeochemistry of DOC/DON in a Watershed Context
Date: Wednesday, June 12, 2002
Time: 10:15:00 AM
Location: Carson B
 
SchiffSL, University of Waterloo, Waterloo, Canada, sschiff@uwaterloo.ca
Humphries, S, A, University of Waterloo, Waterloo, Canada, 
Spoelstra, J, , University of Waterloo, Waterloo, Canada, 
Wu, F, C, Trent University , Peterborough, Canada, 
Ferguson, G, A, University of Waterloo, Waterloo, Canada, 
Elgood, R, J, University of Waterloo, Waterloo, Canada, 
Mitchell, M, J, State University of New York, Syracuse, USA, 
Jeffries, D, S, National Water Research Institute, Burlington, Canada, 
Dillon, P, J, Trent University, Peterborough, Canada, 
Evans, R, D, Trent University, Peterborough, Canada, 
 
SOURCES AND DIAGENSIS OF DOM IN FORESTED WATERSHEDS: WHAT CAN ISOTOPES OF TOTAL DOM TELL US?
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Dissolved organic matter (DOM) is a complex mixture of thousands of compounds of differing chemical reactivity. Rapid and convenient analyses are needed to characterize DOM and follow DOM sources, diagenesis and fate. Changes in 15N/14N, 13C/12C, C/N, 14C and 34S/32S of DOM along flowpaths have important implications for development of soil isotope profiles and tracing sources of DOM. Isotopic analysis of DOM in the bulk parent soil material will be compared to DOM collected in lysimeters, DOM leached from soils and DOM in streams and lakes at three sites; a boreal forest at Experimental Lakes Area, Ontario, a sugar maple forest at Turkey Lake Watershed, Ontario and a sugar maple-beech forest in the Adirondack Mtns. of USA. At forested catchments near Dorset Ontario, large volume samples of DOM in precipitation, throughfall, groundwaters, streams and lakes were collected to determine the range of elemental, spectroscopic, isotopic and metal binding indicators.