Mark Blake
Westhay Moor Peatland Restoration Project
Amazing Peatlands
Peatlands are an amazing part of our landscapes, not only for the rare and specialised species they support but for the ecosystem services they provide like storing carbon, filtering drinking water, mitigating flood waters etc. Yet 80% of the UK’s peatland are degraded, emitting carbon and threatening the species they support.
Over time agricultural and industrial processes have affected the way peat absorbs and releases water. When peat becomes degraded in this way, its ability to hold water below the surface of the ground is reduced. When healthy, the peat can hold large quantities of water, sucking it up like a sponge, but when it becomes oxidised it does not manage water in the same way.
Photo: Andrew Kirby and Alan Ashman
All the remaining peat at Somerset Wildlife Trust’s Westhay Moor nature reserve has been subject to drainage and peat extraction. This has damaged the hydrology of the peat, meaning that it is drying out and making it more susceptible to drought, wildfire, the encroachment of scrub and trees as well as emitting carbon to the atmosphere.
Over the next two years this restoration project aims to slow the flow of water within the peat itself using the deep trench bunding (or cell bunding) technique to seal up sub-surface fissures and cracks which allow the water to move too quickly through our peatland.
Cell bunding involves removing the ‘turf’ on the surface and digging a deep trench. The healthier wet peat that is removed is then put back in the trench and compacted, building a wall within the peatland. The turf is then put back on top of the bund. This process is used to form seals below the surface that allow the peat to retain the water that is needed for the peat to re-wet.
Westhay Moor Restoration Project map. Illustration: Tim Baigent, Glyder Ltd
A number of the specialist peat bog species we want to support, and that are already present at the site such as sphagnum mosses, the carnivorous sundew, micro-plume moth, large marsh grasshopper, bog bush cricket and cotton grasses will benefit from these works and in restoring open habitat we may find ground nesting birds like lapwing are at the site more often.
Through the project we will be creating dead standing timber which will provide a great habitat for a whole host of invertebrates and also provide feeding corridors for bats. We will also be building new hibernacula in areas that are intended to stay drier for adders which have migrated onto the site in drier conditions.
Close-up of Sphagnum moss - Mark Hamblin/2020VISION
Round leaved sundew {Drosera rotundifolia}, Westhay Nature Reserve (Somerset Wildlife Trust), Somerset Levels, Somerset, UK. June 2011. - Ross Hoddinott/2020VISION
Photo: Steve Maskell
Photo: Max Thompson
Photo: Clive Morgan
Cotton Grasses - Mark Hamblin/2020VISION
Lapwing: Image: CANVA/ Getty Images
Adder © Jon Hawkins
Westhay Moor Peat Restoration is a long term project that will take many years of work. Observations at other peat restoration projects suggest that it takes around 3 years for the peat system to recharge hydrologically at which point we hope that the plants and animals that ensure the health of the ecosystem will really begin to thrive. We have planned a phased approach to works across the site over the coming years.
There are 3 main stages to each area that is earmarked for restoration:
Vegetation Management
Remove the vegetation that is drying out and damaging the peat. The carefully planned removal of some trees as the project evolves will not put any of the existing species on the site at risk but will create a habitat more suited to the plant and animal species that would have originally inhabited the peat bog. While it may seem counter intuitive to remove trees it should be remembered that trees would not have been a part of the original peat bog landscape and can only survive as a result of intensive agricultural and industrial drainage. They have a negative effect on the health of the peat by effectively pumping water out of the bog and creating shade in a way that stops target species from growing.
Landscape view of Westhay Moor nature reserve, 2023. Photo: Sian Russell
Hydrological Remediation
Restoring the site’s hydrology to slow the flow of water both inside the peat and on top of it. The peat shrinks and expands which causes cracks and fissures to develop. In some cases, these act like pipes which increase the drainage of water across and away from the peat. This negatively impacts the way in which essential plants that form the peat grow (primarily sphagnum mosses) which in turn further degrades the peat bog.
Re-establishing Peatland Plant Communities
Where needed we will be giving the peatland plant communities a helping hand to re-establish a little faster by cultivating and planting new mosses and plants.
Sphagnum moss with fruiting capsules, Westhay Nature Reserve, Somerset Levels. Image: Ross Hoddinott/2020VISION
We have a network of water level monitoring points across the whole reserve some of which have many years of data associated with them. With help from our volunteers we will continue to monitor these locations for years to come to see whether the works to slow the flow of water and raise the water level year round within the peat have been successful.
The restoration works began in September 2023 and will continue until March 2025. Read the FAQ's for more detailed answers to your questions.
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