We hypothesized that perhaps the N originating from atmospheric N fixation was more likely to be exported as organic N forms and this would be consistent with organic N dominating N export in many pristine systems. A tribute to tributaries: River studies elucidate links between human activity and nutrient export across a broad range of watersheds: This article belongs to Ambio's 50th Anniversary Collection. Nitrogen saturation is defined by the idea that if N loading of the watershed goes high enough, the retention of N in the watershed could decrease substantially (Aber [1]). [Extracted from the article]
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