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Residual effects of nutrient additions were sustained in shrubs 4-8 years after fertilization stopped in a northern boreal forest in Yukon, Canada. We measured the growth rate of grey willow (Salix glauca L.) and bog birch (Betula glandulosa Michx.) twigs during the growing seasons of 1998, 2001, and 2002, 4-8 years after NPK fertilization from 1987 to 1994 had ceased. We also measured the nitrogen concentration of the 1998 growth tissue. Willow twigs had significantly higher growth rates in previously fertilized shrubs than control shrubs in these 3 years, even greater than differences observed during fertilization. Willow also had higher N concentration in fertilized twigs than control twigs. Birch growth was...
Categories: Publication; Types: Citation; Tags: M1-Ecosystems, M1-Flora
The spatial patterns of trees and shrubs within the forest-tundra ecotones in the Mealy Mountains, Newfoundland and Labrador, and in the Ruby Ranges, Yukon Territory were characterized using spatial pattern analysis. The processes influencing the recruitment of juvenile trees into the adult population and how they may facilitate or hinder infilling and advance at Canada's treeline were inferred. In Labrador, trees were generally aggregated; recruitment into the adult population could be regulated by facilitation. Conversely, in the Yukon, trees were generally regularly distributed, possibly influenced by competition. At both sites, trees were generally independent of shrub cover. The spatial arrangement of trees...
Categories: Publication; Types: Citation; Tags: M1-Ecosystems


map background search result map search result map Forest floor moisture content and fire danger indices in Alaska EFFECTS OF HISTORICAL TIMBER HARVESTING PRACTICES ON CARIBOU FORAGE LICHEN ABUNDANCE NEAR MARSH LAKE, YUKON  -  PHASE 1 FINAL REPORT EFFECTS OF HISTORICAL TIMBER HARVESTING PRACTICES ON CARIBOU FORAGE LICHEN ABUNDANCE NEAR MARSH LAKE, YUKON  -  PHASE 1 FINAL REPORT Forest floor moisture content and fire danger indices in Alaska