1992
DOI: 10.1017/s0033822200063918
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Sources and Transformation of Dissolved Organic Carbon in the Harp Lake Forested Catchment: The Role of Soils

Abstract: ABSTRACT. 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 t… Show more

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citations
Cited by 62 publications
(46 citation statements)
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“…The SOM2 pool has a turnover time of approximately 20 years. Thus, in DAISY the main source of DOM can be attributed to humified material with an age comparable with the findings of Trumbore et al (1992) and Tegen and Dorr (1996).…”
supporting
confidence: 77%
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“…The SOM2 pool has a turnover time of approximately 20 years. Thus, in DAISY the main source of DOM can be attributed to humified material with an age comparable with the findings of Trumbore et al (1992) and Tegen and Dorr (1996).…”
supporting
confidence: 77%
“…Data on change in 14 C indicate that most of the DOC in soil is fairly old, at least 30 years at 5 cm depth (Tegen and Dorr, 1996) and at 10-25 cm (Trumbore et al, 1992), supporting that SOM is the major source of DOM. This is also supported by findings of Hagedorn et al (2004) who found that the DOC in topsoils contained only 5-10% of C which could be attributed to recent additions from the vegetation (throughfall, litter, roots) of spruce and beech.…”
mentioning
confidence: 93%
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“…A S13C profile for SOM at Harp 4-21 subcatchment agrees with the data reported by Natelhoffer and Fry (1988), which show a S13C change from -29%o at the surface to -25%o at a depth of 35 cm (Trumbore et al 1992 (114)(115)(116)(117)(118) at the very shallow part of the soil, with values close to 100 pMC at a depth between 5 and 10 cm. Older carbon, with 14C content equal to or less than 80 pMC, is present at depths below 15 cm (Trumbore et al 1992).…”
Section: C Composition Of Soil Co2supporting
confidence: 88%
“…Factor 1 accounted for 60.1% of the variability in the data set, whereas Factor 2 accounted for 21% of the variability. from soil leachates that have been found in previous studies to be depleted in 13 C but enriched in 14 C (Trumbore et al 1992) and to have C : N ratios of ,15 (Schlesinger 1997). In addition, during high-flow conditions, increased water column turbidity may limit the growth of microalgae in this region of the bay, thereby reducing the potential contribution of freshwater phytoplankton as a primary source of organic matter.…”
Section: Discussionmentioning
confidence: 94%