Highly fragmented European wetlands with uneven restoration needs

Area of Science:

• Ecology and Environmental Science
• Remote Sensing and Geospatial Analysis
• Conservation Biology

Background:

• European wetlands are vital carbon sinks but face degradation from land use, impacting carbon stocks and biodiversity.
• The EU Nature Restoration Law (NRL) mandates wetland restoration, yet detailed spatial data on wetland condition is lacking.
• Existing data products often lack the resolution to identify fragmented wetland ecosystems.

Purpose of the Study:

• To create a high-resolution, standardized map of European wetland types and land-use disturbance.
• To assess the extent of human impact on European wetlands and estimate potential carbon loss.
• To provide data supporting the EU Nature Restoration Law's restoration targets and progress tracking.

Main Methods:

• Utilized 10-m satellite imagery and machine learning algorithms.
• Mapped six semi-natural open wetland types and land-use disturbance across 38 European countries.
• Quantified wetland fragmentation and estimated soil carbon loss due to human activities.

Main Results:

• Identified significant wetland fragmentation, with a substantial portion in small patches (<25 ha and <1 ha).
• Estimated that human activities impact 20.4% of wetland areas, with inland types most affected.
• Estimated potential soil carbon loss up to 5 Gt CO2-eq and found variability in national NRL commitments relative to mapped areas.

Conclusions:

• The developed high-resolution wetland maps provide an EU-wide baseline for the NRL.
• The findings highlight the need for targeted restoration efforts, especially in fragmented and inland wetlands.
• The study offers a reproducible framework for using satellite data to inform and track conservation policies.