ARCTIC The Areal Pattern of Burned Tree Vegetation in the Subarctic Region of Northwestern Canada
ABSTRACT. Vegetation and terrain analyses of 1312 air photos spanning the subarctic, low arctic, and portions of the adjacent high boreal region of northwestern Canada permitted geographic characterization of the areal pattern of burned forest and forest-tundra vegetation. In terms of its lower area...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1990
|
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.562.7067 http://pubs.aina.ucalgary.ca/arctic/arctic44-3-223.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.562.7067 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.562.7067 2023-05-15T14:19:50+02:00 ARCTIC The Areal Pattern of Burned Tree Vegetation in the Subarctic Region of Northwestern Canada K. P. Timoney Ross W. Wein The Pennsylvania State University CiteSeerX Archives 1990 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.562.7067 http://pubs.aina.ucalgary.ca/arctic/arctic44-3-223.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.562.7067 http://pubs.aina.ucalgary.ca/arctic/arctic44-3-223.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.aina.ucalgary.ca/arctic/arctic44-3-223.pdf Key words boreal climate fire ecology Northwest Territories spruce Subarctic vegetation weather text 1990 ftciteseerx 2016-01-08T12:07:14Z ABSTRACT. Vegetation and terrain analyses of 1312 air photos spanning the subarctic, low arctic, and portions of the adjacent high boreal region of northwestern Canada permitted geographic characterization of the areal pattern of burned forest and forest-tundra vegetation. In terms of its lower areal extent of burns, and lower frequency of air photos showing burns, the forest-tundra is distinct from both open crown and closed crown forest regions. Burns show a general decrease in areal coverage from the northwest (Mackenzie River to Great Bear Lake: 0-50 % of the terrain) to the southeast (Great Slave Lake to Hudson Bay: 0-10%). In the northwest, the flat till plains, high cover of continuous mature forest, and scarcity of lakes, coupled with dominance of slowly regenerating white spruce (in the forest-tundra) may help to account for the extensive burned vegetation. In the eastern half of the study region, the northern limit of burns normally does not extend beyond the line where tree cover equals upland tundra cover. In this eastern sub-region, tree cover decreases rapidly northward within the southern half of the forest-tundra, constraining the areal extent of individual burns. Burns extend about 25-75 km into the forest-tundra, decreasing in areal coverage with distance east of Great Slave Lake. Burn cover in the forest-tundra north of Great Slave Lake generally exceeds that east of Great Slave Lake. Weather patterns and an abundance of lakes may help to account for the lower cover of burns east of Great Slave Lake. Burns north of Great Slave Lake peak in cover in the low Subarctic along a NW-SE a x i s that lies NE of high fire risk and occurrence zones. Strong correlations were observed between burn cover and upland tundra cover (-r) and between burn cover and the treexpland tundra cover ratio (+r). Text Arctic Arctic Great Bear Lake Great Slave Lake Hudson Bay Mackenzie river Northwest Territories Subarctic Tundra Unknown Arctic Northwest Territories Hudson Bay Mackenzie River Canada Hudson Great Slave Lake ENVELOPE(-114.001,-114.001,61.500,61.500) Great Bear Lake ENVELOPE(-120.753,-120.753,65.834,65.834) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
Key words boreal climate fire ecology Northwest Territories spruce Subarctic vegetation weather |
spellingShingle |
Key words boreal climate fire ecology Northwest Territories spruce Subarctic vegetation weather K. P. Timoney Ross W. Wein ARCTIC The Areal Pattern of Burned Tree Vegetation in the Subarctic Region of Northwestern Canada |
topic_facet |
Key words boreal climate fire ecology Northwest Territories spruce Subarctic vegetation weather |
description |
ABSTRACT. Vegetation and terrain analyses of 1312 air photos spanning the subarctic, low arctic, and portions of the adjacent high boreal region of northwestern Canada permitted geographic characterization of the areal pattern of burned forest and forest-tundra vegetation. In terms of its lower areal extent of burns, and lower frequency of air photos showing burns, the forest-tundra is distinct from both open crown and closed crown forest regions. Burns show a general decrease in areal coverage from the northwest (Mackenzie River to Great Bear Lake: 0-50 % of the terrain) to the southeast (Great Slave Lake to Hudson Bay: 0-10%). In the northwest, the flat till plains, high cover of continuous mature forest, and scarcity of lakes, coupled with dominance of slowly regenerating white spruce (in the forest-tundra) may help to account for the extensive burned vegetation. In the eastern half of the study region, the northern limit of burns normally does not extend beyond the line where tree cover equals upland tundra cover. In this eastern sub-region, tree cover decreases rapidly northward within the southern half of the forest-tundra, constraining the areal extent of individual burns. Burns extend about 25-75 km into the forest-tundra, decreasing in areal coverage with distance east of Great Slave Lake. Burn cover in the forest-tundra north of Great Slave Lake generally exceeds that east of Great Slave Lake. Weather patterns and an abundance of lakes may help to account for the lower cover of burns east of Great Slave Lake. Burns north of Great Slave Lake peak in cover in the low Subarctic along a NW-SE a x i s that lies NE of high fire risk and occurrence zones. Strong correlations were observed between burn cover and upland tundra cover (-r) and between burn cover and the treexpland tundra cover ratio (+r). |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
K. P. Timoney Ross W. Wein |
author_facet |
K. P. Timoney Ross W. Wein |
author_sort |
K. P. Timoney |
title |
ARCTIC The Areal Pattern of Burned Tree Vegetation in the Subarctic Region of Northwestern Canada |
title_short |
ARCTIC The Areal Pattern of Burned Tree Vegetation in the Subarctic Region of Northwestern Canada |
title_full |
ARCTIC The Areal Pattern of Burned Tree Vegetation in the Subarctic Region of Northwestern Canada |
title_fullStr |
ARCTIC The Areal Pattern of Burned Tree Vegetation in the Subarctic Region of Northwestern Canada |
title_full_unstemmed |
ARCTIC The Areal Pattern of Burned Tree Vegetation in the Subarctic Region of Northwestern Canada |
title_sort |
arctic the areal pattern of burned tree vegetation in the subarctic region of northwestern canada |
publishDate |
1990 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.562.7067 http://pubs.aina.ucalgary.ca/arctic/arctic44-3-223.pdf |
long_lat |
ENVELOPE(-114.001,-114.001,61.500,61.500) ENVELOPE(-120.753,-120.753,65.834,65.834) |
geographic |
Arctic Northwest Territories Hudson Bay Mackenzie River Canada Hudson Great Slave Lake Great Bear Lake |
geographic_facet |
Arctic Northwest Territories Hudson Bay Mackenzie River Canada Hudson Great Slave Lake Great Bear Lake |
genre |
Arctic Arctic Great Bear Lake Great Slave Lake Hudson Bay Mackenzie river Northwest Territories Subarctic Tundra |
genre_facet |
Arctic Arctic Great Bear Lake Great Slave Lake Hudson Bay Mackenzie river Northwest Territories Subarctic Tundra |
op_source |
http://pubs.aina.ucalgary.ca/arctic/arctic44-3-223.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.562.7067 http://pubs.aina.ucalgary.ca/arctic/arctic44-3-223.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766291559439925248 |