Effects of wetland restoration on GHG-balance and ecosystem function in Iceland
GHG fluxes from drained peatlands are the single largest component of Iceland‘s national Greenhouse Gas (GHG) budget. The Icelandic ReWet project was initiated in 2023 to further our understanding of how carbon, water and nutrient cycles, GHG balances and ecosystem structure and function change when drained peatlands are rewetted.
It is important to ensure that estimates of GHG emissions from drained peatlands in Iceland are in fact happening and then how Iceland’s and the world’s climate goals can be helped by restoring some of them to more natural state by rewetting.
Figure: CO2, CH4 and N2O fluxes and mass transfer components contributing to soil C-stock changes in an ecosystem on a drained organic soil in Iceland. Arrows indicate flux/transfer direction. Hexagons refer to WP-numbers within the ReWet project. Graph modified from Jauhiainen et al. (2019; 2023).
Novel research
The ReWet project is set up following recommendations of the newest international review papers on the subject.
Peatlands are varied terrestrial ecosystems that, although occupying only 7% of the earth’s surface, store one third of the world’s terrestrial carbon. When these ecosystems are drained to be converted into agricultural lands, forest plantations or for creating space for human infrastructures, such as roads or new urban areas, they release GHGs, especially carbon dioxide, methane and nitrous oxide, increasing global warming, and therefore, consequent climate change.
Undisturbed peatlands provide an array of valuable “environmental services” for society and the environment. Besides their important role the global carbon cycle and climate, they are unusually rich in plant and animal biodiversity, they reduce erosion and flood risks, clean water and not to mention that they are often beautiful places for birdwatching and other outdoor activities.
At present the project is focused on three adjacent sites in W-Iceland: i) Large drained peatland site at Lækjarnes (LN) that was studied for two years before it was rewetted early in 2025. ii) Another comparable drained peatland site which remains undrained at the Lækur Farm (LL) and iii) a pristine undrained peatland at Lambhaganes (LHN).
Impact of Peatland Rewetting

Rewetting peatlands can reduce net-GHG emissions compared to drained conditions and increase biodiversity. Here below are some of the research hypotheses that ReWet strives to answer:
- Reduction in GHG Emissions 90%
- Increase in Biodiversity 80%
- Improvement in Water Quality 70%
Management structure
The ReWet project is managed by a Management Committee (MC).

Bjarni Diðrik Sigurðsson (AUI). MC chair.

Chenxin Feng (AUI). MC member and SC chair.

Sunna Áskelsdóttir (LFI). MC member

Auður Sigurbjörnsdóttir (UA). MC member

Tryggvi Stefánsson (S). MC member

ari Minkkinen (UH). MC member Key stakeholder

Vilhjálmur Ólafsson, owner of the Lækur farm
Participants
Bjarni Diðrik Sigurðsson (AUI) MC chair.
MC chair / WP3
bjarni(at)lbhi.is
Asra Salimi - Agric. Univ. Iceland
WP1/PhD student
asra(at)lbhi.is
Chenxin Feng - Agric. Univ. Iceland
SC chair / Postdoc
chenxin.feng(at)umu.se
Alejandro Salazar Villegas - Agric. Univ. Iceland
WP2b
alejandro(at)lbhi.is
Hlynur Óskarsson - Agric. Univ. Iceland
WP2b / WP6
hlynur(at)lbhi.is
Susanne Möckel - Agric. Univ. Iceland
WP6
susanne(at)lbhi.is
Friederike Danneil - Agric. Univ. Iceland
WP6
friederike(at)lbhi.is
Sólveig Sanchez - Agric. Univ. Iceland
Technician
solveig(at)lbhi.is
Elanor Greer - Agric. Univ. Iceland
Technician / MSc Stud.
nem.elg3(at)lbhi.is
Tryggvi Stefánsson - Svarmi ehf.
MC
tryggvi(at)svarmi.com
Amir Hamidpour - Svarmi ehf.
WP4
amir(at)svarmi.com
Asra Salimi - Svarmi ehf.
WP4
asra(at)svarmi.com
Auður Sigurbjörnsdóttir - Univ. Akureyri
MC / WP5
mas(at)unak.is
Oddur Þór Vilhelmsson
WP5
oddurv(at)unak.is
Brynhildur Bjarnadóttir - Univ. Akureyri
WP1 / WP3
brynhildurb(at)unak.is
Sunna Áskelsdóttir - Land and forest Iceland
MC / WP8 / WP2a
sunna.askelsdottir(at)landogskogur.is
Ölvir Styrmisson - Land and forest Iceland
WP2a
olvir.styrmisson(at) landogskogur.is
Ágústa Helgadóttir
WP8
agusta.helgadottir(at)landogskogur.is
Helena Marta Stefánsdóttir
WP7
helena.stefansdottir(at) landogskogur.is
Páll Sigurðsson - Land and forest Iceland
WP7
pall.sigurdsson(at)landogskogur.is
Brynja Hrafnkelsdóttir - Land and forest Iceland
WP9 (extra work)
brynja.hrafnkelsdottir(at) landogskogur.is
Kristín Sveiney Baldursdótitr - Land and forest Iceland
WP7
kristin.baldursdottir(at)landogskogur.is
Vigdís Freyja Helmutsdóttir - Land and forest Iceland
WP9
vigdis.freyja.helmutsdottir(at) landogskogur.is
Piia Tomingas - External location
WP9, PhD student
piia.tomingas4(at)gmail.com
Kayla B. Streeper - External location
WP6, MSc student
kbs33(at)hi.is
Kari Minkkinen - External location
MC
kari.minkkinen(at)helsinki.fi
In memorium
The rewetting of Lækjarnes is done in the memory of the late Einar Helgason (b. 10.9.2022; d. 01.11.1999) and Vilborg Kristófersdóttir (b. 30.07.2023; d. 04.05.2020) by their only surviving grandchild, Vilhjálmur Ólafsson.
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