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Titre du document / Document title

Fog and acidification impacts on ion budgets of basins in Nova Scotia, Canada

Auteur(s) / Author(s)

YANNI S. (1) ; KEYS K. (1) ; CLAIR T. A. (2) ; ARP P. A. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Faculty of Forestry and Environmental Management, University of New Brunswick, Fredericton, N.B. E3B 6C2, CANADA
(2) Environmental Conservation Branch, Environment Canada-Atlantic Region, P.O. Box 6227, Sackville, N.B. E4L 1G6, CANADA

Résumé / Abstract

We examined hydrogeochemical records for a dozen watersheds in and near Kejimkujik National Park in southwestern Nova Scotia by relating stream ion concentrations and fluxes to atmospheric deposition, stream type (lake inlet versus outlet; brown versus clear water), and watershed type (catchment area, topography, soils, and dominant forest cover type). We found that fog and dry deposition make important contributions to S, N, Cl, H, Ca, Mg, K, and Na inputs into these watersheds. Seasalt chloride deposition from rain, snow, fog, and dry deposition equal total stream outputs on a region-wide basis. Chloride outputs, however, differ among watersheds by a factor of about two, likely due to local differences in air flow and vegetational fog interception. We found that most of the incoming N is absorbed by the vegetation, as stream water NO3- and NH4+ are very low. Our results also show that the vegetation and the soils absorb about half of the incoming SO4-2. In comparison with other North American watersheds with similar forest vegetation, Ca outputs are low, while Mg and K outputs are similar to other regions. Soil exchangeable Ca and soil cation exchange capacity are also very low. We found that first-order forest streams with no upstream lakes have a distinct seasonal pattern that neither corresponds with the seasonal pattern of atmospheric deposition, nor with the seasonal pattern of downstream lake outlets.

Revue / Journal Title

Journal of the American Water Resources Association    ISSN  1093-474X   CODEN JWRAF5 

Source / Source

2000, vol. 36, no3, pp. 619-631 (38 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Water Resources Association, Middleburg, VA, ETATS-UNIS  (1997) (Revue)

Mots-clés anglais / English Keywords

acidification

;

pollution

;

Nova Scotia

;

vegetation

;

forests

;

atmospheric precipitation

;

drainage basins

;

seasonal variations

;

river discharge

;

hydrochemistry

;

fallout

;

atmospheric emission

;

lakes

;

sulfur

;

nitrogen

;

chlorine

;

hydrogen

;

calcium

;

magnesium

;

potassium

;

nitrate ion

;

ammonium ion

;

absorption

;

soils

;

cation exchange capacity

;

water quality

;

Maritime Provinces

;

Eastern Canada

;

Canada

;

North America

;

Mots-clés français / French Keywords

Acidification

;

Pollution

;

Nouvelle Ecosse

;

Végétation

;

Forêt

;

Précipitation atmosphérique

;

Bassin versant

;

Variation saisonnière

;

Débit rivière

;

Hydrochimie

;

Retombée

;

Emission atmosphérique

;

Lac

;

Soufre

;

Azote

;

Chlore

;

Hydrogène

;

Calcium

;

Magnésium

;

Potassium

;

Ion nitrate

;

Ion ammonium

;

Brouillard

;

Interception végétation

;

Absorption

;

Sol

;

Capacité échange cation

;

Qualité eau

;

Provinces Maritimes

;

Canada Est

;

Canada

;

Amérique du Nord

;

Mots-clés espagnols / Spanish Keywords

Acidificación

;

Polución

;

Nueva Escocia

;

Vegetación

;

Bosque

;

Precipitación atmosférica

;

Cuenca

;

Variación estacional

;

Caudal río

;

Hidroquímica

;

Lluvia radioactiva

;

Lago

;

Azufre

;

Nitrógeno

;

Cloro

;

Hidrógeno

;

Calcio

;

Magnesio

;

Potasio

;

Ión nitrato

;

Ión amonio

;

Absorción

;

Suelo

;

Capacidad intercambio catión

;

Calidad agua

;

Canadá Este

;

Canada

;

America del norte

;

Localisation / Location

INIST-CNRS, Cote INIST : 15182, 35400009012593.0140

Nº notice refdoc (ud4) : 1410343



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