Aboveground whole-tree N-productivity relationships were developed for balsam poplar, birch, and white spruce trees (Table 1).
Relationships were calculated for the individual-tree aspen, balsam poplar, and white spruce data sets (Table 2).
In the floodplain sites the range was from 31.0 for white spruce on the FP4B site to 184.3 kg annual growth/kg foliar N for balsam poplar on the FP2A site (Table 3).
In addition, our survey tallied at least 10 small stands of balsam poplar at this site.
Candidate species include those now known to exist north of the treeline in Arctic Alaska, such as balsam poplar, trembling aspen, and white spruce, as well as those that may become established by the end of the century, such as Alaska paper birch (Betula neoalaskana), black spruce (Picea mariana), or American larch (Larix laricina).
Balsam poplar (Populus balsamifera L.) communities on the Arctic Slope of Alaska.
Balsam poplar (Populus balsamifercr, Salicaceae) beyond the tree line in the Western Canadian Mainland Arctic (Northwest Territories).
Key words: balsam poplar, tree line, Arctic, Northwest Territories, Populus balsamifera, floristics, phytogeography, climate change
Such baseline data may help us to understand how these northern species and their ecosystems responded to changing climate in the past, and how they might respond to the warmer Arctic climate that is predicted for the coming decades (e.g.., Feng et al., 2011).Here we report new data and summarize existing information on extralimital stands of the tree species balsam poplar from the northeastern Northwest Territories, extending the geographical and ecological range of balsam poplar into the mainland Canadian Arctic.
Balsam poplar (Populus balsamifera L., Salicaceae) is the northernmost tree species in North America, and with such species as Larix laricina (Du Roi) K.
Although balsam poplar generally ranges to the tree line, disjunct populations have been reported from Arctic regions well beyond the tree line.
Extralimital stands of balsam poplar are less well known in Canada.