Aspen Bibliography

Document Type

Article

Author ORCID Identifier

Nathan T. Lauer https://orcid.org/0000-0002-5852-534X

Journal/Book Title/Conference

Trees

Volume

36

Publisher

Springer

First Page

1633

Last Page

1648

Publication Date

6-17-2022

Abstract

Revegetation of boreal forest lands disturbed by surface mining for bitumen can be challenging due to fluctuating levels of soil NaCl and harsh winter temperatures. These stressors may hinder the growth and survival of planted tree seedlings. Two experiments were carried out to examine the processes of recovery from NaCl stress and overwintering in trembling aspen, tamarack, and white spruce seedlings. In the recovery experiment, seedlings were treated with 0, 50, or 100 mM NaCl for 60 days and then allowed to recover for 60 days. Most of the examined physiological variables (total dry weight, chlorophyll concentration, photosynthesis, and transpiration) in all examined species returned to control levels after 30 days of recovery from the NaCl treatment. In the overwintering experiment, seedlings were subjected to 0 or 50 mM NaCl treatment throughout the first growing season, overwintered, and treated with 0, 50, or 100 mM NaCl for 8 weeks during the second growing season. All tested species exhibited foliar chlorosis and necrosis from NaCl treatment in the first year. Several similarities were observed between species in both experiments, including increased foliar K and necrosis in trembling aspen and tamarack. Trembling aspen exhibited remarkably low foliar Na, whereas tamarack and white spruce had high concentrations of foliar Na despite the recovery of physiological variables to control levels. Elevated foliar K, necrosis, and Na management may constitute important salt resistance mechanisms for the tree species tested.

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