Abstract
We examined the rate of photoammonifi- cation in 16 lakes from Saskatchewan, Canada. Lakes were selected to encompass a broad range in dissolved organic nitrogen (DON) (269-1,435 l gl -1 ). Lake filtrate (\0.2 lm) was exposed to artificial solar radiation for 4 h. Rates of photoammonification were significant in 7 of the 16 study lakes. Ammonia (NH3) concentrations increased 0.84-2.85 l gl -1 over con- trol values. This is a 4-92% increase in NH3 concen- tration and a conversion of 0.18-0.3% of the DON pool to NH3. We developed an empirical model to predict photoammonification rates across aquatic ecosystems. Photoammonification rates and ancillary parameters (i.e., pH, DOC and DON concentrations, DOC:DON ratios, and a350:DOC) were obtained from published studies to expand our dataset for model development. Model selection was conducted with Akaike's Infor- mation Criterion (AIC). DON concentration and pH were selected as model predictors by AIC. Our model explains 49% of the variance in photoammonification rate across a diverse set of aquatic systems. This model may be useful in estimating photoammonification rates in other aquatic systems.
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