Title: Brooks Range Treeline White Spruce Branch Primary Growth (2019-2022)
Measurements of treeline white spruce annual branch primary growth during 2019, 2020, 2021 and 2022. Measurements were made using digital calipers on branches at breast height with persistent apical dominance. The purpose of of this dataset was to examine spatial variation in treeline white spruce branch growth across the Brooks Range and in relation to local microclimates.  more » « less
Award ID(s):
1748849 1748773
PAR ID:
10468971
Author(s) / Creator(s):
; ; ;
Publisher / Repository:
NSF Arctic Data Center
Date Published:
Subject(s) / Keyword(s):
white spruce treeline Picea glauca Arctic
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
More Like this
  1. Measurements of treeline white spruce needle length and needle mass per unit projected needle area on needles produced and sampled 2019, 2021 and 2022. Measurements of needle length and projected area were made using WinSeedle software on scans of the needle samples. The purpose of of this dataset was to examine spatial variation in treeline white spruce needle attributes across the Brooks Range and in relation to local microclimates. 
    more » « less
  2. Measurements of treeline white (Picea glauca) and black (P. mariana) spruce abundance during 2019, 2020, 2021 and 2022 as sampled within n = 695 5-meter (m) radius plots (area = 78.5 square meters), each centered on a selected white spruce adult called "Focal Tree". Measurements included height of stems between 0.5 and 1.4 m tall and diameter at 1.4 m for individuals taller than 1.4 m. Those individuals taller than 1.4 m tall were also stem mapped in polar coordinates with r = distance and theta as magnetic direction from a focal center white spruce tree. The purpose of this dataset was to examine spatial variation in treeline white spruce densities and basal area across the Brooks Range and in relation to local microclimates. It also provides a baseline for future stem mapping to determine changes in abundance. 
    more » « less
  3. Measurements of treeline white spruce needle carbon, nitrogen and phosphorus concentrations, along with stable isotopes of carbon and nitrogen. Samples were collected of the most recent needle cohort at breast height in August and September. The purpose of this dataset was to examine spatial variation in white spruce needle nutrition and gas exchange physiology across the Brooks Range and in relation to local microclimates. The 2021 and 2022 datasets contain data for treeline trees that were treated with NPK fertilizer at a sub-set of the research sites. 
    more » « less
  4. Measurements of treeline white spruce fine root (<2 millimeters (mm)) carbon, nitrogen concentrations, along with stable isotopes of carbon and nitrogen. Fine roots (<2 mm) were collected from soil cores taken at the dripline below focal trees. The purpose of this dataset was to examine spatial variation in white spruce root nutrition across the Brooks Range and in relation to local microclimates. The dataset contains data for treeline trees that were treated with NPK (nitrogen, phosphorus, potassium) fertilizer at a sub-set of the research sites. 
    more » « less
  5. Abstract: Tree-ring width records of white spruce (Picea glauca [Moench] Voss) trees sampled along the Thelon River (64º03’N / 103º87’W, 160 m a.s.l.) in 2004. When using this dataset, please cite: Lévesque, M., Andreu-Hayles, L., D’Arrigo, R., Oelkers, R., & Buckley, B. M. (2023). Non-linear Growth and Physiological Responses of White Spruce at North American Arctic Treeline. Journal of Geophysical Research: Biogeosciences, 128, e2022JG007096. https://doi.org/10.1029/2022JG007096 Project abstract: Temperatures in Arctic and subarctic North America are rising and are projected to continue to rise. Furthermore, atmospheric carbon dioxide is increasing around the globe. This project evaluates the response of white spruce to these ongoing changes. It uses archived samples from ten sites, standard tree-ring methodologies supplemented by novel chemical analyses, and numerical models to understand tree growth response to changing environmental drivers. Extending traditional tree-ring width and maximum latewood density records, the principal investigators established a high latitude network of stable carbon (d13C) and oxygen (d18O) isotope measurements, which provide an independent constraint on such changes relative to traditional dendroclimatological measurements. This project represents an interdisciplinary opportunity to combine three distinct disciplines: (1) basic dendrochronological techniques, which allow for precisely-dated, quantitative and verifiable long-term tree-ring records; (2) low temperature geochemical tools to measure del13C and del18O ratios that independently reflect environmental variables including temperature, precipitation, relative humidity and long-term physiological information on water use efficiency in natural forests; and (3) the joint use of a process-based mechanistic model, MAIDENiso, to distinguish between the confounding effects of increases in temperatures and atmospheric CO2 and to predict boreal forest response under different scenarios, and the NASA GISS ModelE2 general circulation model to provide inputs to MAIDENiso. 
    more » « less