Foliar loading and metabolic assimilation of dry deposited nitric acid air pollutants by trees

Journal of Environmental Monitoring : JEM
P E PadgettRobert L Heath

Abstract

Dry deposition of nitric acid vapor (HNO(3)) is a major contributor to eutrophication of natural ecosystems. Although soil fertilization by nitrogen deposition is considered to be the primary pathway for changes in plant nutrient status and shifts in ecological structure, the aerial portion of plants offer many times the surface area in which to collect atmospheric HNO(3). As much as 60% of deposited nitrogen may be retained in the canopy and not land on the soil surface below. Although uptake and assimilation appears to contribute to retention, only a small percentage of dry deposition is recovered in assimilated N pools. To test the importance of biological activity on the process and measurements of dry deposition, we used controlled environmental chambers to compare deposition to living and freeze-dried foliage of four tree species using (15)N-labeled HNO(3). In living trees, assimilation was determined by (15)N incorporation into free amino acids and proteins in leaves and roots. From 10% to 60% of the retained HNO(3) was incorporated into the biologically active nitrogen pool. The remainder was bound to foliar surfaces in an insoluble form in either living or freeze-dried foliage. The importance of the boundary layer cond...Continue Reading

References

May 1, 1994·Plant Physiology·J. Imsande, B. Touraine
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Citations

Jun 7, 2011·Ecological Applications : a Publication of the Ecological Society of America·Sharon J HallScott L Collins
Aug 18, 2012·American Journal of Public Health·Alva O FerdinandNir Menachemi
Dec 31, 2009·PLoS Genetics·Rachel A F WozniakMatthew K Waldor
Apr 8, 2017·Environmental Science and Pollution Research International·Anna AvilaRocío Alonso
Mar 23, 2018·Conservation Physiology·Edison A Díaz-ÁlvarezErick de la Barrera
May 1, 2018·Environmental Pollution·Elizabeth M CookSharon J Hall
Aug 14, 2019·Environmental Science & Technology·Jenna E RindyKathleen C Weathers

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