Turkey Lakes Watershed Study reference list: 2010

10-01 Zhang, J., J. Hudson, R. Neal, J. Sereda, T. Clair, M. Turner, D. Jeffries, P. Dillon, L. Molot, K. Somers and R. Hesslein.  Long-term patterns of dissolved organic carbon in lakes across eastern Canada: evidence of a pronounced climate effect. Limnology and Oceanography 55, 30-42, 2010.

Summary: Lakes of the TLW were among 55 lakes from 5 regions in eastern Canada analyzed for DOC dynamics during ice-free periods.  At the TLW an increase of annual mean temperature did not correspond to changes in DOC.  The long-term DOC pattern at TLW was not related to the variation in precipitation as it was elsewhere, and was only weakly related to the Southern Oscillation Index and the Pacific Decadal Oscillation. 

10-02 Spoelstra, J., S.L. Schiff, R.G. Semkin, D.S. Jeffries, R.J. Elgood.  Nitrate attenuation in a small temperate wetland following forest harvest.  Forest Ecology and Management 259, 2333-2341, doi:10.1016/j.foreco.2010.03.006, 2010.

Summary: A wetland in the TLW watershed (catchment 31) was the focus of a nitrate attenuation study utilizing stable isotope techniques.  Analysis of δ18O, δ15N demonstrated that concentrations of nitrate were significantly lower in outflow than in inflow to the wetland, and nitrate removal is even complete in some areas.  Forest harvesting effects on aquatic systems could thus be reduced if small wetlands are preserved in the watershed.

10-03 Snider, D.M., J. Spoelstra, S.L. Schiff and J.J. Venkiteswaran.  Stable oxygen isotope ratios of nitrate produced from nitrification: 18O-labeled water incubations of agricultural and temperate forest soils.  Environmental Science and Technology 44, 5358-5364, 2010.

Summary: Organic-rich soil from the upland forest at the TLW along with mineral soils from a well-tilled agricultural area in Ontario were treated to establish a model to describe the formation of microbial NO3- using  18O-labeled H2O.  The oxygen isotope exchange between the 2 types of soils varied widely and demonstrated that the microbial endmember cannot be successfully predicted at present.

10-04 Mitchell, M.J., G. Lovett, S. Bailey, F. Beall, D. Burns, D. Buso, D. T Clair, F. Courchesne, L. Duchesne, C. Eimers, I. Fernandez, D. Houle,  D.S. Jeffries, G. E. Likens, M. D. Moran, C. Rogers, D. Schwede, J. Shanley, K.C. Weathers and R. Vet. Comparisons of watershed sulfur budgets in southeast Canada and northeast US: new approaches and implications. Biogeochemistry 103 (1-3), 181-207, doi:10.1007/s10533-010-9455-0, 2010.

Summary: Deposition of anthropogenic S has acidified terrestrial and aquatic ecosystems in eastern North America. S deposition has been declining, however, and ecosystems have begun to recover. S mass balances were evaluated for 15 watershed sites in southeastern Canada and northeastern US (including the TLW). Most watersheds showed net annual losses of SO42-. Net annual fluxes of SO42- showed a strong relationship with hydrology as the largest net annual negative fluxes were associated with years of greatest precipitation and highest discharge amounts. Mobilization of internal S, likely from the mineralization of previously deposited S, contributed to stream fluxes and effected the rate of recovery from acidification.

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