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High variability in the decay of dissolved organic carbon from different boreal litter sources; a challenge to land-water carbon flux modeling

Hensgens, Geert LU ; Arellano, Carlos LU ; Smith, Benjamin LU ; Poska, Anneli LU and Berggren, Martin LU (2016) ASLO Summer meeting, 2016
Abstract
Dynamic ecosystem modelling offers potentially groundbreaking possibilities to reconstruct and project exports of Dissolved Organic Carbon (DOC) from land to surface water. However, the balance between production, degradation and export of soil DOC remains a challenge to model in boreal forests, partly because variability in soil DOC turnover is poorly understood. Here we determined the heterogeneity in decay potentials for DOC leached from main litter sources in boreal forest. We measured 48h leaching potentials (20°C in pure water) of fresh and pre-degraded leaf and wood litter, and subsequently performed short- and long-term standardized bioassays. Leaching and decay potentials of DOC varied more than tenfold between species. Broadleaf... (More)
Dynamic ecosystem modelling offers potentially groundbreaking possibilities to reconstruct and project exports of Dissolved Organic Carbon (DOC) from land to surface water. However, the balance between production, degradation and export of soil DOC remains a challenge to model in boreal forests, partly because variability in soil DOC turnover is poorly understood. Here we determined the heterogeneity in decay potentials for DOC leached from main litter sources in boreal forest. We measured 48h leaching potentials (20°C in pure water) of fresh and pre-degraded leaf and wood litter, and subsequently performed short- and long-term standardized bioassays. Leaching and decay potentials of DOC varied more than tenfold between species. Broadleaf trees and shrubs generally showed highest magnitudes and variability in both DOC leaching and subsequent decay, compared to coniferous materials. However, it appears impossible to predict differences in decay potentials without considering both the physical structure and chemical composition of source materials. We suggest that a thorough inventory of soil DOC sources with regard to decay potentials is needed to adequately model the response in DOC export to changes in climate and vegetation. (Less)
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author
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organization
publishing date
type
Contribution to conference
publication status
published
subject
pages
1 pages
conference name
ASLO Summer meeting, 2016
conference location
Santa Fé, United States
conference dates
2016-06-05 - 2016-06-10
project
An empirical framework for large-scale modeling of dissolved organic carbon fluxes across soils and water
language
English
LU publication?
yes
id
3b7fe0ac-f002-498e-bc54-8743fb01a8e9
date added to LUP
2018-07-05 16:06:24
date last changed
2021-01-28 02:52:42
@misc{3b7fe0ac-f002-498e-bc54-8743fb01a8e9,
  abstract     = {{Dynamic ecosystem modelling offers potentially groundbreaking possibilities to reconstruct and project exports of Dissolved Organic Carbon (DOC) from land to surface water. However, the balance between production, degradation and export of soil DOC remains a challenge to model in boreal forests, partly because variability in soil DOC turnover is poorly understood. Here we determined the heterogeneity in decay potentials for DOC leached from main litter sources in boreal forest. We measured 48h leaching potentials (20°C in pure water) of fresh and pre-degraded leaf and wood litter, and subsequently performed short- and long-term standardized bioassays. Leaching and decay potentials of DOC varied more than tenfold between species. Broadleaf trees and shrubs generally showed highest magnitudes and variability in both DOC leaching and subsequent decay, compared to coniferous materials. However, it appears impossible to predict differences in decay potentials without considering both the physical structure and chemical composition of source materials. We suggest that a thorough inventory of soil DOC sources with regard to decay potentials is needed to adequately model the response in DOC export to changes in climate and vegetation.}},
  author       = {{Hensgens, Geert and Arellano, Carlos and Smith, Benjamin and Poska, Anneli and Berggren, Martin}},
  language     = {{eng}},
  title        = {{High variability in the decay of dissolved organic carbon from different boreal litter sources; a challenge to land-water carbon flux modeling}},
  year         = {{2016}},
}