How effective are created or restored freshwater wetlands for nitrogen and phosphorus removal? A systematic review protocol

Table 3 Parameters and data that will be recorded if provided

Loading characteristics	Wetland characteristics	Climate characteristics	Study design parameters	Results
Type of water	Type of wetland	Annual mean air temperature	Study length	Annual average removal rates (g m^-2 y^-1)
Concentrations and speciation of N and P at inlet	Length, Width, Depth,	Annual mean water temperature	Sampling frequency	Annual average removal efficiency (% of load)
Annual average inflow loadings	Area	Ice coverage	Flow proportional Sampling (Y/N)	Number of observations (years)
Hydraulic load (m/d)	Hydroperiod (d)	GPS coordinates		Standard deviation
Timing of peak discharge	Dominant plant species and coverage	Climate type¹⁾
Residence time (d)	Sediment/soil type
pH	Land use history and wetland age
	O₂ concentration and redox potential
	Fauna
	Management methods
	Main purpose of wetland
	Other characteristics²⁾

¹⁾According to the Köppen-Geiger climate classification [21]. This data will in most cases not be provided by the primary studies but will be extracted elsewhere.
²⁾May include, e.g., specific substrates, soil amendments, configuration of multiple wetlands, or other means of enhancing the outcome.

ISSN: 2047-2382