Pacific Southwest

Title: Throughfall and fog deposition of nitrogen and sulfur at an N-limited and N-saturated site in the San Bernardino Mountains, southern California

Author: Fenn, Mark E.; Poth, Mark A.; Schilling, Susan L.; Grainger, David B.

Date: 2000

Source: Canadian Journal of Forest Research 30:1476-1488

Description: Inorganic nitrogen (N) and sulfur (S) deposition in bulk throughfall and fog were determined at two sites located at opposite ends (42 km apart) of a pollution gradient in the San Bernardino Mountains. Plot-level averages for total annual N and S deposition in throughfall in 1996 were 18.8 and 2.9 kg·ha^–1, respectively, at Camp Paivika (CP) and 2.9 and 0.4 kg·ha^–1, respectively, at Barton Flats (BF). Deposition of N in throughfall in the four transects at CP ranged from 12.1 to 31.7 kg·ha^–1·year^–1. Spatial variability was high because of heterogenous canopy cover and varying exposure to air pollution. Annual estimated stand-level deposition of N and S in fog were 10.9 and 1.9 kg·ha^–1, respectively, at CP, and 0.6 and 0.2 kg·ha^–1, respectively, at BF. We estimated that N deposition in fog contributed 35% of the total annual N deposition at CP and 13% at BF. Analogous values for S were 39% at CP and 26% at BF. Ammonium deposition in throughfall and fog at CP were 72 and 122% as high as NO₃^– deposition because of elevated NH₃ emissions from dairy farms in the Chino–Norco area 34 km southwest of CP.

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Citation

Fenn, Mark E.; Poth, Mark A.; Schilling, Susan L.; Grainger, David B.  2000.  Throughfall and fog deposition of nitrogen and sulfur at an N-limited and N-saturated site in the San Bernardino Mountains, southern California.   Canadian Journal of Forest Research 30:1476-1488.