Benthic and atmospheric contributions to the nutrient budgets of a soft‐water lake1

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Abstract
Steady state, in situ incubation, and empirical phosphorus models were used to quantify the fluxes of nutrient and redox active materials in Dunham Pond. Benthic flux contributions were about 16 and 45% of the annual silica and ammonia budgets. Labile dissolved organic nitrogen is used by the lake system while refractory dissolved organic nitrogen is being produced. The phosphorus retention estimate based on aerial water loading predicted spring phosphorus concentration and loading more accurately than that based on the phosphorus budget. Atmospheric contributions of phosphorus and dissolved nitrogen account for 25 and 10% of the respective annual budgets.

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