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Table 2 Kind of data/metadata that have been coded/extracted for what study types

From: Existing evidence related to soil retention of phosphorus from on-site wastewater treatment systems in boreal and temperate climate zones: a systematic map

Kind of data/metadata coded/extracted

Study type

Bibliographic information (name and e-mail of first author, title, publisher, year of publication)

LC, LP, VW, VN, G, S

Report type

LC, LP, VW, VN, G, S

Language

LC, LP, VW, VN, G, S

Country, state

LC, LP, VW, VN, G, S

Region

VW, VN, G, S

Site/case (if more than one)

LC, LP, VW, VN, G, S

Geographic coordinates

VW, VN, G, S

Climate zone

VW, VN, G, S

Study setting (field study or laboratory study)

LC, LP, VW, VN, G, S

Study domain (where in the system measurements were conducted)

VW, VN, G, S

Study set-up (soil column or laboratory pilot-scale system)

LC, LP

Aim of study

LC, LP, VW, VN, G, S

Reported measurement(s)/outcome(s)

LC, LP, VW, VN, G, S

Where in the report the relevant results/outcomes are reported

LC, LP, VW, VN, G, S

P species

LC, LP, VW, VN, G, S

General soil description

LC, LP, VW, VN, G, S

Soil order

LC, LP, VW, VN, G, S

Soil texture

LC, LP, VW, VN, G, S

Sand fraction

LC, LP, VW, VN, G, S

Silt fraction

LC, LP, VW, VN, G, S

Clay fraction

LC, LP, VW, VN, G, S

Diameter and soil package height of columns, or length, width and height of soil container

LC, LP

Whether the soil is virgin (that is, not used for wastewater infiltration previously) or not

LC, LP

Whether pH in soil or groundwater not affected by wastewater is reported or not

LC, LP, VW, VN, G

Whether pH in wastewater before infiltration is reported or not

LC, LP, VW, VN

Whether pH in wastewater after infiltration is reported or not

LC, LP, VW, VN

Whether pH in groundwater affected by wastewater discharge is reported or not

G

Whether concentration of oxalate-extractable iron in soil is reported or not

LC, LP, VW, VN, G, S

Whether concentration of dithionite-extractable iron in soil is reported or not

LC, LP, VW, VN, G, S

Whether concentration of oxalate-extractable aluminium in soil is reported or not

LC, LP, VW, VN, G, S

Whether concentration of dithionite-extractable aluminium in soil is reported or not

LC, LP, VW, VN, G, S

Type (origin) of wastewater

LC, LP

Duration/volume of wastewater load

LC, LP, VW, VN, G, S

Wastewater loading rate (volume/area/time unit) or (if data on wastewater loading rate is lacking) wastewater load (volume/time unit)

LC, LP, VW, VN, G

Whether wastewater loading rate is reported or inferable or not

LC, LP, VW, VN, G

Number and kind of entities giving rise to the P load (for example households, persons)

VW, VN, G

Type of OWTS (as described in the report—the terminology is not consistent)

VW, VN, G

Strategy to correct for dilution and/or background P leakage

G

Strategy to correct for dilution

VW, VN

Method to evaluate P retention

LC, LP, VW, VN, G

Whether available data allow calculation of P load to filter (g/m3 material) or not

LC, LP, VW

Whether the study is experimental or observational

VW, VN, G

Number of replicates (for experimental studies)

LC, LP, VW, VN, G

Method to evaluate P retention/possible impact from OWTSs

G

Method to infer possible impact from OWTSs

S

Whether it is possible to isolate the effect of OWSTs or not

S

Whether there is a comparison with control without OWTSs or not

S

Whether there are poor systems (i.e., without soil infiltration) in the catchment area or not

S