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Titolo:
Effects of summer grazing by reindeer on composition of vegetation, productivity and nitrogen cycling
Autore:
Olofsson, J; Kitti, H; Rautiainen, P; Stark, S; Oksanen, L;
Indirizzi:
Umea Univ, Dept Ecol & Environm Sci, SE-90187 Umea, Sweden Umea Univ Umea Sweden SE-90187 col & Environm Sci, SE-90187 Umea, Sweden Univ Oulu, Dept Biol, FIN-90570 Oulu, Finland Univ Oulu Oulu Finland FIN-90570 ulu, Dept Biol, FIN-90570 Oulu, Finland
Titolo Testata:
ECOGRAPHY
fascicolo: 1, volume: 24, anno: 2001,
pagine: 13 - 24
SICI:
0906-7590(200102)24:1<13:EOSGBR>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
YELLOWSTONE-NATIONAL-PARK; ALASKAN TUNDRA; BOREAL FORESTS; GROWTH-FORM; NUTRIENT; OPTIMIZATION; ECOSYSTEM; HERBIVORES; SERENGETI; SOILS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Olofsson, J Umea Univ, Dept Ecol & Environm Sci, SE-90187 Umea, Sweden Umea Univ Umea Sweden SE-90187 nm Sci, SE-90187 Umea, Sweden
Citazione:
J. Olofsson et al., "Effects of summer grazing by reindeer on composition of vegetation, productivity and nitrogen cycling", ECOGRAPHY, 24(1), 2001, pp. 13-24

Abstract

In this study, we investigated the effect of reindeer grazing on tundra heath vegetation in northern Norway. Fences. erected 30 yr ago, allowed us tocompare winter grazed, lightly summer grazed and heavily summer grazed vegetation at four different sites. At two sites, graminoids dominated the heavily grazed zone completely, while ericoid dwarf shrubs had almost disappeared. In the other two areas, the increase of graminoids was almost significant. At one of the sites where graminoids dominated the heavily grazed area. we also measured plant biomass, primary production and nitrogen cycling. In this site: heavy grazing increased primary production and rate of nitrogen cycling, while moderate grazing decreased primary production. These results were inconsistent with the view that the highest productivity is found at intermediate grazing pressure. These results rather support the hypothesis that intensive grazing can promote a transition of moss-rich heath tundra into productive, graminoid-dominated steppe-like tundra vegetation. More over the results suggests that intermittent intensive reindeer grazing can enhance productivity of summer ranges.

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Documento generato il 23/09/20 alle ore 04:43:01