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Forests 2016, 7(12), 312;

Foliage Chemistry of Pinus baksiana in the Athabasca Oil Sands Region, Alberta, Canada

School of Biological Sciences, University of Tasmania, Hobart, TAS 7001, Australia
Canadian Forest Service, Natural Resources Canada, Victoria, BC V8Z 1M5, Canada
Department of Geoscience, University of Calgary, Calgary, AB T2N 1N4, Canada
Author to whom correspondence should be addressed.
Academic Editors: Jesus Julio Camarero, Raúl Sánchez-Salguero and Juan Carlos Linares
Received: 14 October 2016 / Revised: 30 November 2016 / Accepted: 2 December 2016 / Published: 8 December 2016
(This article belongs to the Special Issue Forest Growth Response to Environmental Stress)
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Industrial emissions in the Athabasca Oil Sands Region (AOSR), Alberta, Canada, have caused concerns about the effect of oil sands operations on the surrounding terrestrial environments, including jack pine (Pinus banksiana Lamb.) stands. We collected jack pine needles from 19 sites in the AOSR (13–128 km from main operations) for foliar chemical analyses to investigate the environmental impact on jack pine. Pine needles from three age classes, the current annual growth (CAG, 2011), one year and two year old pine needles, were collected. Samples were analyzed for total carbon (TC), nitrogen (TN), and sulfur (TS), inorganic S (SO4-S), base cations (Ca, Mg, Na), and other elements (B, Cu, Fe, Mn, P, Zn); CAG needles were also analyzed for their nitrogen and carbon isotopic compositions. Only TN, TS, Ca, B, Zn, and Fe contents showed weak but significant increases with proximity to the major oil sands operations. C and N isotopic compositions showed no trend with distance or TC and TN contents. Total S contents in CAG of pine foliage increased significantly with proximity to the main industrial operation while foliar inorganic S to organic S ratios (SO4-S/Sorg) ranged consistently between 0.13 and 0.32, indicating low to moderately high S loading. Hence, this study suggests some evidence of uptake of S emissions in close proximity to anthropogenic sources, although the reported values have not reached a level of environmental concern. View Full-Text
Keywords: foliage; jack pine; nitrogen; carbon; isotopes; Athabasca oil sands foliage; jack pine; nitrogen; carbon; isotopes; Athabasca oil sands

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Proemse, B.C.; Maynard, D.G.; Mayer, B. Foliage Chemistry of Pinus baksiana in the Athabasca Oil Sands Region, Alberta, Canada. Forests 2016, 7, 312.

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