In:
Canadian Journal of Forest Research, Canadian Science Publishing, Vol. 30, No. 9 ( 2000-09-01), p. 1476-1488
Abstract:
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 NO 3 - deposition because of elevated NH 3 emissions from dairy farms in the Chino-Norco area 34 km southwest of CP.
Type of Medium:
Online Resource
ISSN:
0045-5067
,
1208-6037
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
2000
detail.hit.zdb_id:
1473096-0
SSG:
23
SSG:
12
Bookmarklink
