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Lakes nested in forested watersheds play an important role in mediating theconcentrations and fluxes of dissolved organic matter. We compared long-termpatterns of concentrations and fluxes of dissolved organic carbon (DOC) anddissolved organic (DON) and inorganic nitrogen (DIN) in aquatic ecosystems ofthe Arbutus Lake watershed to evaluate how a lake nested in a forestedwatershed affects the sources (e.g., production) and sinks (e.g., retention)of DOC and DON in the Adirondack Mountains of New York, USA. Weobserved no significant long-term changes of DOC and DON in the lake outletsince 1983 and 1994, respectively. However, the temporal patterns of DOC andDON concentrations in the lake inlet showed significant seasonality such asincreases during the vegetation-growing season along with notable decreasesin the dormant season. A comparison of mass balances between inlet and outletfor the period from 2000 to 2009 suggested that the lake was a sink of DOC(mean of influx minus outflux: +1140 mol C ha−1 yr−1). Incontrast, the difference of discharge-weighted DON concentrations (mean ofinlet minus outlet: −1.0 µmol N L−1) between inlet andoutlet was much smaller than the discharge-weighted DOC concentrations(average of inlet minus outlet: + 87 µmol C L−1). DONfluxes showed considerable variation among years (mean of influx minusoutflux: +8 mol N ha−1 yr−1; range of differences: −15 to27 mol N ha−1 yr−1). DON exhibited low percent retention((influx-outflux)/influx) (mean: 6.9 %, range: −34.8 to +31.2)compared to DOC (mean: 30.1 %, range: +9.2 to +44.1). The resultantincrease of DON within the lake was closely linked with a net decrease of DINthrough monthly Pearson correlation analysis, suggesting the importance ofbiotic factors in mediating lake DON dynamics. Our results show differentrelative retentions of DOC compared with DON, along with a larger retentionof DIN than DON, suggesting that DOC and DON might display substantiallydifferent biogeochemical relationships in oligo-mesotrophic lakes nestedforested watersheds and therefore different roles for a sink behavior for DOCcompared to a producer of DON

biogeosciences

Importance of within-lake processes in affecting the dynamics of dissolved organic carbon and dissolved organic and inorganic nitrogen in an Adirondack forested lake/watershed