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Title: Dry deposition of nitrogen and sulfur to ponderosa and jeffrey pine in the San Bernardino National Forest in southern California
Author: Fenn, Mark E.; Bytnerowicz, Andrzej
Source: Environmental Pollution 81:277-285
Description: Little is known about the concentrations, deposition rates, and effects of nitrogenous and sulfurous compounds in photochemical smog in the San Bernardino National Forest (SBNF) in southern Calfirnia. Dry deposition of NO3- and NH4+ to foliage of ponderosa pine (Pinus ponderosa Laws.) and Jeffrey pine (Pinus jeffreyi Grev. & Bay) was correlated (R = 0·83-0·88) with historical average hourly 03 concentrations at 10 sites across an O3 gradient in the SBNF. Mean deposition fluxes of NO3- to ponderosa and Jeffrey pine branches were 0·82 nmol m-2 s-1 at Camp Paivika (CP), a high-pollution site, and 0·19 nmol m-2 s-1 at Camp Osceola (CAO), a low-pollution site. Deposition fluxes of NH4+ were 0·32 nmol m-2 s-1 at CP and 0·17 nmol m-2 s-1 at CAO , while mean values for SO4-2 were 0·03 at CP and 0·02 nmol m-2 s-1 at CAO . Deposition fluxes to paper and nylon filters were higher in most cases than fluxes to pine branches at the same site.
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Fenn, Mark E.; Bytnerowicz, Andrzej 1993. Dry deposition of nitrogen and sulfur to ponderosa and jeffrey pine in the San Bernardino National Forest in southern California. Environmental Pollution 81:277-285
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