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Titolo:
PHYSICAL AND CHEMICAL LIMNOLOGY OF NORTHERN BOREAL LAKES, WOOD BUFFALO NATIONAL-PARK, NORTHERN ALBERTA AND THE NORTHWEST-TERRITORIES, CANADA
Autore:
MOSER KA; SMOL JP; LEAN DRS; MACDONALD GM;
Indirizzi:
UNIV UTAH,DEPT GEOG,260 S CENT CAMPUS DR,RM 270 SALT LAKE CITY UT 84112 MCMASTER UNIV,DEPT GEOG HAMILTON ON L8S 4K1 CANADA QUEENS UNIV,DEPT BIOL,PEARL KINGSTON ON K7L 3N6 CANADA UNIV OTTAWA,DEPT BIOL OTTAWA ON K1N 6N5 CANADA UNIV CALIF LOS ANGELES,DEPT GEOG LOS ANGELES CA 90024
Titolo Testata:
Hydrobiologia
, volume: 377, anno: 1998,
pagine: 25 - 43
SICI:
0018-8158(1998)377:<25:PACLON>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRECAMBRIAN SHIELD LAKES; ORGANIC-CARBON; FRESH-WATERS; ACIDIFICATION; TEMPERATURE; PHOSPHORUS; SUBSTANCES; STREAMS; BUDGETS; ONTARIO;
Keywords:
BOREAL FOREST; LIMNOLOGY; SUB-ARCTIC; FIRE; LAKES; PRINCIPAL COMPONENTS ANALYSIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
65
Recensione:
Indirizzi per estratti:
Citazione:
K.A. Moser et al., "PHYSICAL AND CHEMICAL LIMNOLOGY OF NORTHERN BOREAL LAKES, WOOD BUFFALO NATIONAL-PARK, NORTHERN ALBERTA AND THE NORTHWEST-TERRITORIES, CANADA", Hydrobiologia, 377, 1998, pp. 25-43

Abstract

Physical and chemical variables were measured in 35 lakes from Wood Buffalo National Park, northern Alberta and the Northwest Territories, Canada. Of these lakes, 22 were sinkholes, situated on limestone and gypsum, five were situated on the Canadian Shield and eight were shallow 'muskeg' lakes located on calcareous shales. All of the lakes were small to moderate in size. For each of the 35 lakes, 37 environmental variables were measured. Principal component analysis (PCA) revealed that underlying geology strongly influenced limnic properties. Shield lakes were characterized by higher concentrations of Al and Fe, and lower pH values, specific conductivities and concentrations of ions such as, Ca, SO4, Li, Mg and Na, than either the sinkhole or the muskeg lakes. The muskeg lakes were differentiated from the sinkhole lakes by decreased Secchi depth owing to higher concentrations of dissolved organic carbon (DOC) and greater productivity, as evidenced by high concentrations of particulate organic carbon (POC) and chlorophyll a. Nitrogen(NH3 and NO2) was also notably higher at these sites. The 22 sinkholelakes were further classified by the type of surrounding vegetation. Six vegetation groups were recognized: (1)spruce; (2) pine; (3) mixed;(4) shrubs/poplar; (5) recently burned and (6) rocky. These vegetation groups largely reflect fire history, but also differences in soils and drainage. Unlike geology, surrounding vegetation, and therefore recent fire history, generally had little influence on limnic properties. PCA showed that of the six vegetation groups, only the spruce lake group, which was characterized by high levels of DIG, was distinct.

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Documento generato il 02/12/20 alle ore 05:30:56