White spruce (Picea gluaca) at Brooks Range treelines in Alaska: colonists, forest advance, reproduction, recruitment, growth, and physiochemical condition, (2019-2022)

• Main Authors: Roman J. Dial, Colin Maher, Rebecca Hewitt, Amy Wockenfuss, Russell Wong, Patrick Sullivan
• Format: Dataset
• Language: unknown
• Published: Arctic Data Center
• Subjects: boreal forest advance; sea ice retreat; treeline; white spruce; foliar nutrients; seedling to sapling recruitment; snow; soil temperature; air temperature; soil moisture; forest tundra ecotone; Arctic; Alaska; Brooks Range; 15N; 13C; foliar N; foliar P; cone counts; seedling growth rate; adult growth rate; winter; Picea glauca; North Fork; Wind River; Firth River; Timber Creek; Clear River; Sea ice; Tundra
• Online Access: https://doi.org/10.18739/A2V11VM9D

This dataset includes measurements and estimated variable values from treelines in Alaka's Brooks Range mountains. It includes locations of colonists above treelines found in 2018, 2019, 2020, 2021, and 2022; forest advance rates from the 1970s to 2010s from repeat imagery; growth rates of leaders of juveniles during 2015-2020 and lateral branch growth of adults in 2019; counts of saplings; temperatures of air at 2 meters (m) and soil at 10 centimeters (cm) from 2019-2022; soil moisture in 2019; estimated snow depth in January 2020, 2021, and 2022; foliar nitrogen and phosphorous; and foliar stable isotope ratios for nitrogen (15N:14N) and carbon (13C:12C). The purpose of the dataset is to show the effect of sea ice retreat on treeline advance.