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Table 4 Intervention/exposure groups generated iteratively during the review process with brief descriptions of definitions

From: Evaluating effects of land management on greenhouse gas fluxes and carbon balances in boreo-temperate lowland peatland systems

Intervention/exposure group Definition
Cropped-vs-bare Actively cropped fields compared to those with no vegetation (extracted or de-vegetated)
Drained and restored-vs-undrained Drained and then restored peatlands compared to pristine fen
Drained-vs-undrained Drained peatlands compared to pristine/undrained peats, or heavily drained peatlands compared to lightly drained peats
Dry-vs-wet Dry peat soils compared to wetter soils
Extracted and restored-vs-natural Both extracted and then restored peats compared to unextracted/pristine peats
High intensity farmed-vs-low intensity farmed Intensively compared with extensively farmed peats (in terms of a wide variety of unspecified farming activities)
Fertilised and grazed-vs-unfertilised and mown Both fertilised and grazed compared to unfertilised and ungrazed but mown peats
Fertilised-vs-less fertilised High fertilisation rates compared to low fertilisation rates
Grass-vs-forest Grass fields compared to forested fields
Grazed-vs-mown Grazed peatlands compared to ungrazed but mown fields
Irrigated-vs-non-irrigated Rain fed irrigated peatlands compared to non-irrigated peats
Mineral soil dressed-vs-undressed Peats with added mineral soil compared to soils lacking mineral addition
Old abandoned-vs-recently abandoned Peats abandoned for a longer period compared to more recently abandoned peats
Old afforested-vs-recently afforested Peats planted with trees for a longer period compared to more recently planted forest peatlands
Poor-vs-rich Peats described by authors as ‘poor’ compared to those described as ‘rich’ (corresponding to natural gradients in nutrient status and acidity)
Restored-vs-unrestored Previously extracted peats with deliberately raised water tables compared to extracted and unaltered peatlands