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Permanent link (DOI): https://doi.org/10.7939/R36W96G96

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Modeling the effects of hydrology on gross primary productivity and net ecosystem productivity at Mer Bleue bog Open Access

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Author or creator
Dimitrov, D. D.
Grant, R. F.
LaFleur, P. M.
Humphreys, E.
Additional contributors
Subject/Keyword
Cool temperate bog
Dry summer
Plant-communities
CO2 exchange
Carbon-dioxide exchange
Northern peatland
Boreal peatland
Interannual variability
Ombrotrophic bog
Water-table manipulation
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Abstract: The ecosys model was applied to investigate the effects of water table and subsurface hydrology changes on carbon dioxide exchange at the ombrotrophic Mer Bleue peatland, Ontario, Canada. It was hypothesized that (1) water table drawdown would not affect vascular canopy water potential, hence vascular productivity, because roots would penetrate deeper to compensate for near-surface dryness, (2) moss canopy water potential and productivity would be severely reduced because rhizoids occupy the uppermost peat that is subject to desiccation with water table decline, and (3) given that in a previous study of Mer Bleue, ecosystem respiration showed little sensitivity to water table drawdown, gross primary productivity would mainly determine the net ecosystem productivity through these vegetation-subsurface hydrology linkages. Model output was compared with literature reports and hourly eddy-covariance measurements during 2000-2004. Our findings suggest that late-summer water table drawdown in 2001 had only a minor impact on vascular canopy water potential but greatly impacted hummock moss water potential, where midday values declined to -250 MPa on average in the model. As a result, simulated moss productivity was reduced by half, which largely explained a reduction of 2-3 mmol CO(2) m(-2) s(-1) in midday simulated and measurement-derived gross primary productivity and an equivalent reduction in simulated and measured net ecosystem productivity. The water content of the near-surface peat (top 5-10 cm) was found to be the most important driver of interannual variability of annual net ecosystem productivity through its effects on hummock moss productivity and on ecosystem respiration.
Date created
2011
DOI
doi:10.7939/R36W96G96
License information
Rights
© 2011 American Geophysical Union. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
Citation for previous publication
Dimitrov, D.D., Grant, R.F., LaFleur, P.M. and Humphreys, E. (2011). Modeling the effects of hydrology on gross primary productivity and net ecosystem productivity at Mer Bleue bog. JGR – Biogeosciences, 116, G04010, doi:10.1029/2010JG001586.
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File title: Modeling the effects of hydrology on gross primary productivity and net ecosystem productivity at Mer Bleue bog
File author: Dimitre D. Dimitrov, Robert F. Grant, Peter M. Lafleur, Elyn R. Humphreys
Page count: 17
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