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Titolo:
Landscape modification of DOC concentration in boreal lakes: implications for UV-B sensitivity
Autore:
France, R; Steedman, R; Lehmann, R; Peters, R;
Indirizzi:
Harvard Univ, Grad Sch Design, Cambridge, MA 02138 USA Harvard Univ Cambridge MA USA 02138 d Sch Design, Cambridge, MA 02138 USA Ontario Minist Nat Resources, Ctr No Forest Ecosyst Res, Thunder Bay, ON P7B 5E1, Canada Ontario Minist Nat Resources Thunder Bay ON Canada P7B 5E1 7B 5E1, Canada Univ British Columbia, Vancouver, BC V6T 1Z4, Canada Univ British Columbia Vancouver BC Canada V6T 1Z4 ver, BC V6T 1Z4, Canada McGill Univ, Dept Biol, Montreal, PQ H3A 1B1, Canada McGill Univ MontrealPQ Canada H3A 1B1 Biol, Montreal, PQ H3A 1B1, Canada
Titolo Testata:
WATER AIR AND SOIL POLLUTION
fascicolo: 1-2, volume: 122, anno: 2000,
pagine: 153 - 162
SICI:
0049-6979(200008)122:1-2<153:LMODCI>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISSOLVED ORGANIC-CARBON; PRECAMBRIAN SHIELD LAKES; NORTHWESTERN ONTARIO; RIPARIAN DEFORESTATION; FOREST-FIRES; SOIL-EROSION; WATER; LITTERFALL; RADIATION; ACIDIFICATION;
Keywords:
watershed logging; wildfires; DOC concentration; zooplankton; stable carbon; isotopes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: France, R Harvard Univ, Grad Sch Design, 48 Quincy St, Cambridge, MA 02138USA Harvard Univ 48 Quincy St Cambridge MA USA 02138 e, MA 02138 USA
Citazione:
R. France et al., "Landscape modification of DOC concentration in boreal lakes: implications for UV-B sensitivity", WATER A S P, 122(1-2), 2000, pp. 153-162

Abstract

It has been recently suggested that droughts induced by climate warming reduce the catchment export of colour-forming, and therefore, UV-B protective, DOC to boreal lakes, which in turn may influence the health of resident biota. We determined that the concentration of DOC in 116 Canadian boreal lakes increased in relation to the severity of previous (4-13 yr) catchment forest clearance (reference - buffer strip - wildfire burnt - partial basin clearcut - whole basin clearcut), and was negatively related to water transparency. Removing the landscape influence of catchment drainage ratio showed that lakes within clearcut or burnt watersheds averaged 2 to 3 mg L-1 more DOC than those in reference, undisturbed catchments. Our results suggest the limited possibility that the increased incidence of wildfires coincident with climate warming may partially offset the effects of droughts on catchment export of DOC in the short-term, and thus serve to mitigate the effects of damaging UV-B exposure for selected basins in localized regions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:20:21