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Rewetting does not return drained fen peatlands to their old selves.

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Rewetting drained peatlands restores biodiversity and ecosystem functions, creating new wetland plant communities. This research quantifies restoration success across Europe to aid future peatland management and climate goals.

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Area of Science:

  • Ecology
  • Environmental Science
  • Climate Science

Background:

  • Peatlands, vital carbon and nutrient sinks, are degraded by drainage for land use, becoming sources and losing biodiversity.
  • Rewetting drained peatlands is crucial for biodiversity restoration and climate protection by reducing greenhouse gas emissions.

Purpose of the Study:

  • To quantify the success of peatland rewetting in Europe.
  • To understand the long-term ecological changes in rewetted fen peatlands.

Main Methods:

  • Comparison of 320 rewetted fen peatland sites with 243 near-natural sites.
  • Analysis of vegetation, geochemistry, hydrology, and spectral temporal metrics.
  • Utilizing 10,000 additional European fen vegetation plots for context.

Main Results:

  • Rewetting promotes helophytisation (establishment of tall, graminoid wetland plants).
  • Significant, long-lasting differences in biodiversity, ecosystem functioning, and land cover metrics were observed compared to pre-drainage states.
  • Rewetted sites show distinct ecological characteristics compared to near-natural sites.

Conclusions:

  • Peatland rewetting creates novel ecosystems with unique characteristics.
  • Understanding these novel ecosystems is essential for effective peatland restoration and management.
  • This research supports global climate targets like the Paris Agreement's peatland rewetting goals.