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Table 1 List and description of meta-data variables extracted during coding

From: What are the effects of agricultural management on soil organic carbon in boreo-temperate systems?

Meta-dataDescription
TitleSource article title
AuthorsSource article authors
JournalSource article journal
YearSource article publication year
VolumeSource publication volume
Page start–page endSource publication pages (start page to end page)
Author E-mailSource article corresponding author contact email address
Study countryCountry in which study was undertaken
Location site/nameName or location of study site
LatitudeLatitude cited within article (converted to decimal degrees)
LongitudeLongitude cited within article (converted to decimal degrees)
Köppen climate zoneStated climate zone (according to [39]) or established from latitude and longitude using Köppen Climate Zone GIS layer
Reference to Previous articlesStated reference to previously published work regarding experimental design: likely source of missing information
Study IDReviewer-assigned study identification code
Soil texture, % ClayStated soil clay content (per cent) or stated soil type
Soil Texture, % SiltStated soil silt content (per cent)
Soil texture, % sandStated soil sand content (per cent)
Intervention, startIntervention start date (year)
Intervention, endIntervention end date (year) or soil sampling date (year)
Duration of intervention, yearsTime period intervention was in place before sampling (years)
InterventionIntervention category (see Coding Framework for details of included sub-categories) (crop rotation/fertiliser/amendments/catch crop/tillage/multiple/farming system)
Number of treatmentsTotal number of treatment and control groups
Which treatmentsStated treatment groups (either by intervention group when factorial designs or stated individual intervention combinations)
CropCrop type (annual, perennial, single crop, double crop)
Study DesignDesign of the comparison within the study (Before-after/comparator-intervention/before-after-comparator-intervention)
Comparator typeStated comparator
Experimental designStated design of the experiment (Randomised complete block/split-plot/time series/etc.)
Level of replicationLevel at which true replication was undertaken
Dimension of plotsPlot (subplot) dimensions (metres or hectares)
Number of spatial replicatesNumber of true spatial replicates per treatment group
Temporal replicatesNumber of temporal replicates (repeated measures)
Sampling precisionNumber and type of pseudoreplicates (within true replicate sampling)
Soil sampling depthSoil sampling depth categories for which data are provided independently
C measurement methodCarbon quantification method
OutcomeType of outcome measured (SOC/TOC/SOM/TC/OC)
UnitUnits of measurement
Data locationLocation of relevant outcome data within the article
Bulk densityPresence of bulk density measurements (Measured/Calculated/Not Present)
Variance presentedPresence and location of variance relating to true replication (standard deviation, standard error or confidence interval). Description of ‘next best variance’ if no true replicate variance reported