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Sources and Transformation of Dissolved Organic Carbon in the Harp Lake Forested Catchment: The Role of Soils

Published online by Cambridge University Press:  18 July 2016

S. E. Trumbore ,
S. L. Schiff ,
Ramon Aravena  and
Richard Elgood
S. E. Trumbore
Affiliation:
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore California 94550 USA
S. L. Schiff
Affiliation:
Center for Groundwater Research, University of Waterloo, Waterloo, Ontario N2J 3E6 Canada
Ramon Aravena
Affiliation:
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore California 94550 USA
Richard Elgood
Affiliation:
Center for Groundwater Research, University of Waterloo, Waterloo, Ontario N2J 3E6 Canada
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Abstract

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The 14C content of dissolved organic carbon (DOC) in streams, soil water and groundwaters in the Harp Lake catchment in Ontario, Canada, reflect a mixture of DOC sources, including both contemporary plant material and 14C-depleted soil organic matter. The concentration and isotopic content of DOC in streams is highly variable, reflecting the complex flow path of the source water entering the streams. The characteristics of groundwater DOC are set in the soil column, either through DOC production in the deeper soil layers, or through preferential decomposition and/or sorption of 14C-enriched DOC components from percolating waters. We estimate the relative magnitudes of decomposition, transport and sorption as sinks for DOC produced in forested catchment soils.

Type
II. Applied Isotope Geochemistry
Information
Radiocarbon , Volume 34 , Issue 3: Proceedings of the 14th International Radiocarbon Conference , 1992 , pp. 626 - 635
Copyright
Copyright © The American Journal of Science 

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