Throughfall chemistry in Engelmann spruce - subalpine fir forest in north central Colorado

M. A. Arthur, T. J. Fahey

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Higher concentrations of nutrient cations (Ca, Mg, Na, and K) were found in throughfall than in bulk precipitation, indicating canopy leaching of nutrients and dry deposition onto the canopy followed by wash-off. Ammonium was retained by the canopy. Concentrations of anions (NO3, SO4, and ortho-P) were similar in throughfall and bulk precipitation. Large additions of organic acids to throughfall from foliage were inferred from a 5-fold increase in dissolved organic carbon and a large charge-balance deficit (23%) in throughfall relative to bulk precipitation (8%). Canopy evaporation was estimated at 27%, accounting for a 37% increase in the concentration of dissolved substances in throughfall. Dry deposition resulted in large additions of most cation nutrients and N, but not SO4. Ratios of NO3 to SO4 in wet fall (0.8) and bulk precipitation (1.1) were high and result from proximity to NOx sources in the urban corridor to the east. -from Authors

Original languageEnglish
Pages (from-to)738-742
Number of pages5
JournalCanadian Journal of Forest Research
Issue number4
StatePublished - 1993

ASJC Scopus subject areas

  • Global and Planetary Change
  • Forestry
  • Ecology


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