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• Acrotelm/catotelm
• Water fluxes
• Water tension

Peat bogs differ from other types of wetlands because they receive water only from precipitation. Nevertheless, they are complex hydrological systems and the relationship between water and peat is strongly affected by peat harvesting. For the purpose of peatland restoration, three factors are of major importance: 

1. the structure of peat that comprises the acrotelm and the catotelm
2. the fluxes of water, and
3. the water tension near the peat surface.