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Titolo:
ENVIRONMENTAL-INFLUENCES ON THE STRUCTURE OF SEDGE MEADOWS IN THE CANADIAN HIGH ARCTIC
Autore:
HENRY GHR;
Indirizzi:
UNIV BRITISH COLUMBIA,DEPT GEOG VANCOUVER BC V6T 1Z2 CANADA
Titolo Testata:
Plant ecology
fascicolo: 1, volume: 134, anno: 1998,
pagine: 119 - 129
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLAR DESERT OASIS; PLANT-COMMUNITIES; ELLESMERE ISLAND; BATHURST-ISLAND; BEAR PASS; VEGETATION; TUNDRA; RESPONSES; CLIMATE; NWT;
Keywords:
DOMINANCE-DIVERSITY CURVES; GRAZING; REDUNDANCY ANALYSIS; SPECIES RICHNESS; ARCTIC TUNDRA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
G.H.R. Henry, "ENVIRONMENTAL-INFLUENCES ON THE STRUCTURE OF SEDGE MEADOWS IN THE CANADIAN HIGH ARCTIC", Plant ecology, 134(1), 1998, pp. 119-129

Abstract

Wet sedge-dominated communities (sedge meadows) were sampled in five lowland eases in the Queen Elizabeth Islands of the Canadian High Arctic to assess species-environment relationships. The sites spanned 4 degrees of latitude, and varied in lithology and intensity of grazing bymuskoxen (Ovibos moschatus). A suite of 8 vascular species were common in all meadow stands, with an additional 4-6 species found in most stands. The position of these species in dominance-diversity curves wasnot significantly different between,orated and ungrazed meadows however, the grazed sites appeared to follow a log-normal distribution, while the ungrazed sites were more geometric. Redundancy analysis indicated that grazing intensity is important in determining structure in arctic sedge meadows, largely through increasing the cover of bryophytes and the availability of nitrogen. Greatest species richness was found in the more southerly sites which were moderately grazed and had diversity in microtopography.

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Documento generato il 19/09/20 alle ore 07:50:47