Late Holocene deforestation and tree regeneration in the forest–tundra of Québec

Nature ◽  
1985 ◽  
Vol 313 (6003) ◽  
pp. 570-572 ◽  
Author(s):  
Serge Payette ◽  
Réjean Gagnon
Keyword(s):  
Late Holocene ◽  
Tree Regeneration ◽  
Forest Tundra

scholarly journals Spatially explicit fire-climate history of the boreal forest-tundra (Eastern Canada) over the last 2000 years

2007 ◽  
Vol 363 (1501) ◽  
pp. 2299-2314 ◽  
Author(s):  
Serge Payette ◽  
Louise Filion ◽  
Ann Delwaide
Keyword(s):  
Boreal Forest ◽  
Fire History ◽  
Forest Cover ◽  
Tree Regeneration ◽  
Spatially Explicit ◽  
Fire Event ◽  
Climate History ◽  
Forest Tundra ◽  
Disturbance Factor ◽  
History Of

Across the boreal forest, fire is the main disturbance factor and driver of ecosystem changes. In this study, we reconstructed a long-term, spatially explicit fire history of a forest-tundra region in northeastern Canada. We hypothesized that current occupation of similar topographic and edaphic sites by tundra and forest was the consequence of cumulative regression with time of forest cover due to compounding fire and climate disturbances. All fires were mapped and dated per 100 year intervals over the last 2000 years using several fire dating techniques. Past fire occurrences and post-fire regeneration at the northern forest limit indicate 70% reduction of forest cover since 1800 yr BP and nearly complete cessation of forest regeneration since 900 yr BP. Regression of forest cover was particularly important between 1500s–1700s and possibly since 900 yr BP. Although fire frequency was very low over the last 100 years, each fire event was followed by drastic removal of spruce cover. Contrary to widespread belief of northward boreal forest expansion due to recent warming, lack of post-fire recovery during the last centuries, in comparison with active tree regeneration more than 1000 years ago, indicates that the current climate does not favour such expansion.

scholarly journals Large mammal fauna of the West Siberian forest-tundra zone in the late Holocene

2019 ◽  
Vol 18 (1) ◽  
pp. 43-50
Author(s):  
O.P. Bachura ◽  
P.A. Kosintsev ◽  
T.V. Lobanova
Keyword(s):  
Late Holocene ◽  
Tundra Zone ◽  
The West ◽  
Large Mammal ◽  
Forest Tundra ◽  
Mammal Fauna

Spatial variation in tree regeneration in the forest-tundra ecotone, Rocky Mountain National Park, Colorado

1995 ◽  
Vol 25 (8) ◽  
pp. 1326-1339 ◽  
Author(s):  
Peter J. Weisberg ◽  
William L. Baker
Keyword(s):  
Seedling Establishment ◽  
National Park ◽  
Rocky Mountain ◽  
Tree Regeneration ◽  
Rocky Mountain National Park ◽  
Tree Seedlings ◽  
Tree Seedling ◽  
Forest Tundra ◽  
The Past ◽  
Environmental Controls

Ecotone vegetation may be especially sensitive to climate change. In particular, the invasion of subalpine meadows by tree seedlings has been well documented. However, there has been no systematic analysis of tree regeneration across the environmental heterogeneity of the alpine forest–tundra ecotone (FTE). Also, the position of the FTE may be relictual from more favorable climates of the past and therefore unresponsive to changing climate. To assess the environmental controls on FTE tree regeneration, to determine whether the ecotone might be relictual, and to determine whether tree invasion of nonforested FTE areas is occurring, we measured tree regeneration in various environments within the FTE of Rocky Mountain National Park, Colorado. Generally, seedling establishment appears to be controlled by patterns of soil moisture. Little seedling establishment was observed in krummholz openings, except for high seedling densities in willow wetlands. Tree seedling invasion of tundra is rare. Therefore, the upper limits of the FTE in Rocky Mountain National Park may be relictual from more favorable climates of the past. Abundant seedling establishment in patch forest openings suggests that patch forest may be poised to change to closed forest.

THE EVOLUTION OF THE BLACK SEA’S COASTAL ZONE OF TAMAN’ PENINSULAR IN THE LATE HOLOCENE

2015 ◽  
pp. 63
Author(s):  
A. V. Porotov ◽  
Yu. V. Gorlov ◽  
T. A. Yanina ◽  
E. Fouache
Keyword(s):  
Coastal Zone ◽  
Late Holocene
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