The effects of reindeer grazing on the composition and species richness of vegetation in forest-tundra ecotone

被引：57
|
作者：
Pajunen, Anu [1 ]
Virtanen, Risto [1 ]
Roininen, Heikki [2 ]
机构：
[1] Univ Oulu, Dept Biol, Oulu 90014, Finland
[2] Univ Joensuu, Dept Biol, FIN-80101 Joensuu, Finland
来源：
POLAR BIOLOGY | 2008年 / 31卷 / 10期
基金：
芬兰科学院;
关键词：
Arctic-alpine; frost heath; riparian; graminoid; herbivory; overgrazing; plant community; productivity; rangeland management; willow;
D O I：
10.1007/s00300-008-0462-8
中图分类号：
X176 [生物多样性保护];
学科分类号：
090705 ;
摘要：
We conducted an 8-year exclosure experiment (1999-2006) in a forest-tundra ecotonal area in northwestern Finnish Lapland to study the effects of reindeer grazing on vegetation in habitats of variable productivity and microhabitat structure. The experimental sites included tundra heath, frost heath and riparian habitats, and the two latter habitats were characterized by hummock-hollow ground forms. The total cover of vegetation, cover of willow (Salix spp.), dwarf birch (Betula nana), dwarf shrubs, forbs and grasses (Poaceae spp.) increased in exclosures in all habitats. The increase in the total cover of vegetation and in the covers of willow and dwarf birch tended to be greatest in the least productive tundra heath. Opposing to the increase in the dominant vascular plant groups, the cover and species number of bryophytes decreased in exclosures. We conclude that the effects of reindeer grazing on vegetation composition depend on environmental heterogeneity and the responses vary among plant groups.
引用
收藏
页码：1233 / 1244
页数：12
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