Functions and dynamics of boreal bog vegetation under global changes

Le, Ba Thuong (2021) Functions and dynamics of boreal bog vegetation under global changes. Doctoral (PhD) thesis, Memorial University of Newfoundland.

[img] [English] PDF - Accepted Version
Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.

Download (1MB)


Vegetation with a dominance of Sphagnum and low cover of vascular plants have been recognized as a core component that controls several biogeochemical processes and vital services of boreal bogs, especially in greenhouse gas emissions. The boreal bog plants are long-term adapted to cold, low available nutrient conditions. Therefore, global warming and increases in nitrogen (N) availability may change the boreal bog vegetation and alter the primary services of these boreal ecosystems. This study utilized long-term field experiments to examine the function of vegetation composition in regulating N₂O emissions and dynamics of boreal bog vegetation to the projected global changes. Results show that graminoids accelerate N₂O emissions from boreal bogs under N-enriched conditions. This study also indicates that the long-term warmer (W) and N-enriched conditions enhance vascular plant growth, especially graminoids. By contrast, these environmental changes result in rapid losses of Sphagnum in boreal bogs. Vascular plants mitigate the decline of Sphagnum, although the facilitation by vascular plants can not eliminate the decreases in Sphagnum mosses due to the warming and high N availability. These findings suggest that vegetation might switch to the dominance of vascular plants under warmer, N-enriched conditions, stimulating N₂O emission in boreal bogs.

Item Type: Thesis (Doctoral (PhD))
Item ID: 15300
Additional Information: Includes bibliographical references (pages 105-131).
Keywords: boreal peatland, boreal bog vegetation, climate change, greenhouse gas emissions, nitrogen addition, plant-plant interactions
Department(s): Science, Faculty of > Environmental Science
Date: December 2021
Date Type: Submission
Digital Object Identifier (DOI):
Library of Congress Subject Heading: Climatic changes; Greenhouse gases; Peat mosses; Plants; Biogeochemical cycles; Peatland ecology.

Actions (login required)

View Item View Item


Downloads per month over the past year

View more statistics