Figures & data
FIGURE 1. Mean CO2 efflux over the 2006/2007 cold season in the four principal vegetation types near Daring Lake, Northwest Territories (NWT), Canada (n = 7–9 plots, bars = standard errors). Note that the respiration measurement from the tall birch ecosystem included the shoots of understory plants and all underlying roots and soil, but not the shoots of the birch shrubs that dominate the vegetation of this ecosystem.
FIGURE 2. Diel mean soil temperatures at 5 cm depth during the 2006/2007 cold season in each of the four principal vegetation types near Daring Lake, NWT (n = 4 probes for the tall birch and birch hummock sites; n = 1 for the dry heath and wet sedge sites).
FIGURE 3. Mean CO2 efflux during the cold seasons of 2004/2005 and 2006/2007 in control and snow-fenced birch hummock plots near Daring Lake, NWT (n = 9–10 plots, bars = standard errors).
FIGURE 4. Diel mean soil temperatures at ∼5 cm depth in control and snow-fenced birch hummock sites during the 2006/2007 cold season (n = 4 and 3 probes, respectively) and in the same control sites during the corresponding period in 2004/2005 (n = 2 probes).
TABLE 1 Plant and soil characteristics in each of the major vegetation types near Daring Lake, Northwest Territories, Canada. Data were derived from two separate previous studies (CitationVankoughnett, 2009) (Tall birch and Birch hummock) and (CitationNobrega and Grogan, 2008) (Dry heath and Wet sedge).
FIGURE 5. Diel mean air temperatures and snow depths in dry heath vegetation at the Daring Lake weather station during the cold seasons of 2004/2005 and 2006/2007 (data courtesy of Bob Reid, Department of Indian and Northern Affairs, Canada).
