Monitoring of hydromorphology (IAM protocol: morphodynamic attractiveness index) was carried out by the PNR in 2016 and 2019 immediately downstream of the bog, in order to monitor the evolution of the substrates of the river Vergne and to evaluate the effect of the restoration of the bog on fine sediments.
• Monitoring of hydromorphology (IAM protocol: morphodynamic attractiveness index)
• Visual observations of the zone after the work
Design & implementations
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Lessons, risks, implications...
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Attitude of decision makers
The low quality of the wood (due to the hydromorphic nature of the soil) and the environmental and regulatory constraints of the site made the forest manager consider the site of low interest both for timber harvesting and for planting new afforestation, and thus facilitated their involvement in the project. It also made it easier to obtain the derogation from the simple forest management plan. The financing of the work proved to be an obstacle, but the owner unblocked the situation by agreeing to transfer the wood to the PNR, which was able to generate revenue from the sale. In addition, the total cost of the project was relatively low, which helped convince the financial partners.
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In order to overcome the difficulty associated with the administrative management of the project - as a public institution, the PNR being unable to invest money in a private plot - it was necessary to obtain project management. An agreement to delegate project management from the Brauze forest group to the PNR was drafted, as well as an agreement dedicated to the fact that the PNR could use the plot to carry out monitoring and to bring the public to the site to show the results.
One unforeseen constraint was the amendment of the forestry code that took place in 2015. At the time the site was designed, the PNR was not affected by the Forest Code. However, the 2015 code required any cut forest area to be replanted, which was contrary to the objectives of the PNR. It was therefore necessary to obtain additional authorization, justified by the multiple benefits of conserving and restoring the bog without replanting trees.
Internally, it was also necessary to find solutions to convince the elected representatives, which required a lot of pedagogy to explain the purpose of this project and the purpose of launching this dynamic.
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Policy, general governance and design targets
Objectives of the NWRM:
• Increase water retention by the bog to improve low-flow support.
• Increase sediment retention by the bog to improve the hydromorphology of the watercourse (la Vergne).
Others objectives from the project manager:
• Work in collaboration with the silvicultural community.
• Restore the environmental functionalities of heritage wetland habitats.
• Promote the avifauna targeted by the Millevaches plateau Special Protection Zone (SPZ) (including Short toed Eagle).
• Improve the landscape in the municipality.
• Promote the exemplarity of the approach.
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the peat bog is part of a special conservation zone
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• A strong regeneration of peaty habitats, and an expansion of sphagnum development over a large part of the plot in 2017.
• The appearance of 4 species of odonata, 5 species of orthopterans and one species of lepidoptera specific to peatlands.
• On some parts of the plot, a dynamic of closure (implantation of birch trees and willows) and drying (appearance of molinia turds).
• Due to the incision of the bed of the Vergne, the lack of hydrological reconnection of the associated wetlands with the watercourse.