Table 1 Description of variables contained in the dataset.
From: Global dataset of soil organic carbon in tidal marshes
Variable name | Units | Descriptor | Type |
|---|---|---|---|
Source | Study from which the data was extracted | Character | |
Original_source | If the source study was a review, the original study of the data | Character | |
Data_type | Core-level, site-level, or from a review | Character | |
Site | The name of the site where core(s) were taken | Character | |
Core | Core ID | Character | |
Plot | If site-level data, identifier of the site | Character | |
Site_name | Unique ID per plot or core | Character | |
Soil_type | Soil type (i.e., peat, sand, silt, mud) when specified | Character | |
Latitude | Decimal degrees | Geographic coordinate of sample location in WGS84 (N - S) | Numeric |
Longitude | Decimal degrees | Geographic coordinate of sample location in WGS84 (E - W) | Numeric |
accuracy_flag | Accuracy of geographic coordinate (direct from dataset, averaged, or estimated using Google Earth) | Character | |
Country | The name of the country where the soil cores were taken | Character | |
Admin_unit | Administrative unit below country level (Nation, State, Emirate) | Character | |
Year_collected | The year of the collection. If cores were taken over several years, the year the collection started | Integer | |
Year_collected_end | If cores were taken over several years, the last year collected | Integer | |
U_depth_m | Metres | Upper depth of soil core | Numeric |
L_depth_m | Metres | Lower depth of soil core | Numeric |
Method | Method used to measure organic carbon (%). Elemental analysis (EA), loss-on-ignition (LOI), Walkley Black | Character | |
Conv_factor | Conversion factor used to convert soil organic matter measured via LOI to organic carbon | Character | |
OC_perc | % | Soil organic carbon measurement | Numeric |
BD_g_cm3 | g cm−3 | Dry bulk density measurement | Numeric |
SOM_perc | % | Soil organic matter measurement | Numeric |
N_perc | % | Nitrogen (%), if measured alongside C in a CN analyser. | Numeric |
Time_replicate | Time replicate for soil sampled more than once a year (summer, winter, month-specific) | Character | |
Treatment | Site-specific information (control, invaded, univaded, grazed, ungrazed, historic-breach, managed realignment, post-fire) | Character | |
n_cores | Number of cores in site-level or review measurements, when data available | Integer | |
SOM_perc_mean | % | Mean of soil organic matter measured (data not at core-level) | Numeric |
SOM_perc_sd | % | Standard deviation of the mean of soil organic matter measured | Numeric |
OC_perc_mean | % | Mean of soil organic carbon measured (data not at core-level) | Numeric |
OC_perc_sd | % | Standard deviation of the mean of soil organic matter measured | Numeric |
OC_perc_se | % | Standard error of the mean of soil organic matter measured | Numeric |
BD_g_cm3_mean | g cm−3 | Mean of dry bulk density measured (data not at core-level) | Numeric |
BD_g_cm3_sd | g cm−3 | Standard deviation of the mean of dry bulk density measured | Numeric |
BD_g_cm3_se | g cm−3 | Standard error of the mean of dry bulk density measured | Numeric |
OC_from_SOM_our_eq | % | Soil organic carbon estimated from soil organic matter using our equation (Fig. 4) | Numeric |
OC_obs_est | Method of OC measurement: “Observed”, “Estimated (study equation)” - OC from LOI with regional eq. (see Conv_factor column), “Estimated (our equation)” - OC from LOI with Eq. 3 | Character | |
OC_perc_final | % | Coalesce of all columns of OC_perc (OC_perc, OC_perc_mean, and OC_from_SOM_our_eq) | Numeric |
Notes | Varying sample-specific notes (i.e., flagged outliers) | Character | |
DOI | Source study DOI URL | Character |
