Vance C. Kennedy S. Marc Zand Ronald J. Avanzino Gary W. Zellweger Michael J. Sebetich 1984 <p><span>Injections of NO</span>₃<span>&nbsp;and PO</span>₄<span>&nbsp;were made during September 1975 into Little Lost Man Creek, a small pristine stream in Redwood National Park, California. Chloride, a conservative constituent, was added in a known ratio to the nutrients. Nutrient loss at a downstream point was calculated using concentration of added Cl as a reference. Nitrate nitrogen (NO</span>₃<span>‐N), added for 4 h, reached 920 μg/1 (above 5 μg/1 background) just below the injection point, but increased only to 405 μg/1 at 310 m downstream. The concentration decrease was attributed to dispersion and to uptake by stream biota. Percent of NO</span>₃<span>‐N lost decreased with increasing concentration of NO</span>₃<span>‐N. Phosphate phosphorus (PO</span>₄<span>‐P) was added a week after the NO</span>₃<span>‐N for 3 h, causing a concentration increase of 296 μg/1 (above 13 μg/1 background) just below the injection point, of 161 μg/1 at 90 m downstream, and of 98 μg/1 at 310 m. Percent loss of PO</span>₄<span>‐P at downstream sites increased with increasing PO</span>₄<span>‐P concentration and also for a short period after peak concentration occurred, but then decreased as PO</span>₄<span>‐P concentration continued decreasing. Differences in stream response to added NO</span>₃<span>‐N and PO</span>₄<span>‐P are attributed to differing rates of reaction with biota and differing degrees of interaction with abiotic stream solids.</span></p> application/pdf 10.1111/j.1752-1688.1984.tb04646.x en American Water Resources Association Dynamics of added nitrate and phosphate compared in a northern California woodland stream article