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).

Figure 1

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.

ReWet.is

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% 90%
  • Increase in Biodiversity 80% 80%
  • Improvement in Water Quality 70% 70%

Founding partners, are scientists working at:

Agricultural University of Iceland (AUI)
Land and Forest Iceland (LFI)
University of Akureyri (UA)
Svarmi ehf. (S)
University of Helsinki (UH)
University of Iceland – Project: Peatlands Under Pressure

Management structure

The ReWet project is managed by a Management Committee (MC).

ReWet

Bjarni Diðrik Sigurðsson (AUI). MC chair.

ReWet

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

ReWet

Sunna Áskelsdóttir (LFI). MC member

ReWet

Auður Sigurbjörnsdóttir (UA). MC member

ReWet

Tryggvi Stefánsson (S). MC member

ReWet

ari Minkkinen (UH). MC member Key stakeholder

ReWet

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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