(Table 2) Survivorship of transplanted seedlings of Picea glauca inside and outside three tree islands in 1994, 1995, 2009 and after 15 years ...

• Main Authors: Walker, Xanthe, Henry, Gregory HR, McLeod, Katherine, Hofgaard, Annika, Pirotta, Enrico
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: Event label; Latitude of event; Longitude of event; Site; Description; Aspect; Surface description; Location; Picea glauca; Survival; Biology; International Polar Year 2007-2008 IPY; albedo; International Polar Year; IPY; Mackenzie Delta; Northwest Territories; Tundra
• Online Access: https://dx.doi.org/10.1594/pangaea.837803; https://doi.pangaea.de/10.1594/PANGAEA.837803

The northern boundary of boreal forest and the ranges of tree species are expected to shift northward in response to climate warming, which will result in a decrease in the albedo of areas currently covered by tundra vegetation, an increase in terrestrial carbon sequestration, and an alteration of biodiversity in the current Low Arctic. Central to the prediction of forest expansion is an increase in the reproductive capacity and establishment of individual trees. We assessed cone production, seed viability, and transplanted seedling success of Picea glauca (Moench.) Voss. (white spruce) in the early 1990s and again in the late 2000s at four forest stand sites and eight tree island sites (clonal populations beyond present treeline) in the Mackenzie Delta region of the Northwest Territories, Canada. Over the past 20 years, average temperatures in this region have increased by 0.9 °C. This area has the northernmost forest-tundra ecotone in North America and is one of the few circumpolar regions where the ... : Table contains additional site information from supplement Table S1. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...