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Dissolved Organic Nitrogen Regulation in Freshwaters

^a School of Agricultural and Forest Sciences, Deniol Road, University of Wales, Bangor, Gwynedd, LL57 2UW, UK
^b Centre for Ecology and Hydrology, Bangor, Gwynedd, LL57 2UW, UK
^c Cardiff School of Biosciences, Cardiff University, P.O. Box 915, Cardiff CF10 3TL, UK

View larger version (21K): [in a new window]   Fig. 1. Map of the individual watersheds used for stream and lake sampling in the study. (A) Map of the whole UK. (B) Map of Wales.

View larger version (18K): [in a new window]   Fig. 2. Relationship between dissolved organic nitrogen (DON) and dissolved inorganic nitrogen (DIN; NO3–) in (A) streams and (B) lakes within Wales. Symbols represent experimentally derived annual means while lines represent the linear regression analysis results.

View larger version (17K): [in a new window]   Fig. 3. Relationship between dissolved organic nitrogen (DON) and dissolved organic carbon (DOC) in (A) streams and (B) lakes within Wales. Symbols represent experimentally derived annual means while lines represent the linear regression analysis results.

View larger version (16K): [in a new window]   Fig. 4. Seasonal relationship between dissolved organic nitrogen (DON), dissolved inorganic nitrogen (DIN), and the DOC to DON ratio in streams and lakes within Wales. Symbols represent experimentally derived winter and summer means while dashed lines represent a theoretical 1:1 relationship.

View larger version (20K): [in a new window]   Fig. 5. Relationship between dissolved inorganic nitrogen (DIN), dissolved organic nitrogen (DON), the DOC to DON ratio, and pH in streams and lakes within Wales. Symbols represent experimentally derived annual means while lines represent the linear regression analysis results.

View larger version (38K): [in a new window]   Fig. 6. Effect of soil type (Histosol and Spodosol) watershed coverage on the concentration of dissolved inorganic nitrogen (DIN), dissolved organic nitrogen (DON), and dissolved organic carbon (DOC) in streams and lakes within Wales. Values represent means ± standard errors.