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-data | Description |
|---|---|
Title | Source article title |
Authors | Source article authors |
Journal | Source article journal |
Year | Source article publication year |
Volume | Source publication volume |
Page start–page end | Source publication pages (start page to end page) |
Author E-mail | Source article corresponding author contact email address |
Study country | Country in which study was undertaken |
Location site/name | Name or location of study site |
Latitude | Latitude cited within article (converted to decimal degrees) |
Longitude | Longitude cited within article (converted to decimal degrees) |
Köppen climate zone | Stated climate zone (according to [39]) or established from latitude and longitude using Köppen Climate Zone GIS layer |
Reference to Previous articles | Stated reference to previously published work regarding experimental design: likely source of missing information |
Study ID | Reviewer-assigned study identification code |
Soil texture, % Clay | Stated soil clay content (per cent) or stated soil type |
Soil Texture, % Silt | Stated soil silt content (per cent) |
Soil texture, % sand | Stated soil sand content (per cent) |
Intervention, start | Intervention start date (year) |
Intervention, end | Intervention end date (year) or soil sampling date (year) |
Duration of intervention, years | Time period intervention was in place before sampling (years) |
Intervention | Intervention category (see Coding Framework for details of included sub-categories) (crop rotation/fertiliser/amendments/catch crop/tillage/multiple/farming system) |
Number of treatments | Total number of treatment and control groups |
Which treatments | Stated treatment groups (either by intervention group when factorial designs or stated individual intervention combinations) |
Crop | Crop type (annual, perennial, single crop, double crop) |
Study Design | Design of the comparison within the study (Before-after/comparator-intervention/before-after-comparator-intervention) |
Comparator type | Stated comparator |
Experimental design | Stated design of the experiment (Randomised complete block/split-plot/time series/etc.) |
Level of replication | Level at which true replication was undertaken |
Dimension of plots | Plot (subplot) dimensions (metres or hectares) |
Number of spatial replicates | Number of true spatial replicates per treatment group |
Temporal replicates | Number of temporal replicates (repeated measures) |
Sampling precision | Number and type of pseudoreplicates (within true replicate sampling) |
Soil sampling depth | Soil sampling depth categories for which data are provided independently |
C measurement method | Carbon quantification method |
Outcome | Type of outcome measured (SOC/TOC/SOM/TC/OC) |
Unit | Units of measurement |
Data location | Location of relevant outcome data within the article |
Bulk density | Presence of bulk density measurements (Measured/Calculated/Not Present) |
Variance presented | Presence 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 |