DOI: 10.5061/dryad.sbcc2frhh
title: A global dataset of soil particulate organic carbon

description: The original data for this paper collected from publised papers, including
 soil paticulate organic carbon concentration, geographic information
 (latitude, longtidue), soil properties (soil type, soil texture, soil
 moisture, soil temperature,soil pH, bulk density, porosity,total organic
 carbon, total nitrogen, soil dissolved carbon, soil dissovled nitrogen,
 soil microbial biomass carbon, soil microbial biomass nitrogen), climatic
 information (mean annual air temperature, mean annual precipitation),
 vegetation type,  sampling dates and depth. A total of 3,418 data
 points were finally collected from the LUCAS database and 244 publications
 from 1988 to 2020. The database was divided into two groups: one group
 consists of 2,507 data points for topsoil (0 – 30 cm) in 632 sites and 911
 data points for soil profile (0 – 100 cm) in 55 sites.
description: The data were collected from publications by searching “soil
 particulate organic carbon” in <em>Web of Science</em> and
 <em>Google Scholar</em>. We derived the data points from
 tables involving soil POC and/or extracted from figures vis the Engauge
 Digitizer software version 10.7.  
description: # Particulate organic carbon original data
 [https://doi.org/10.5061/dryad.sbcc2frhh](https://doi.org/10.5061/dryad.sbcc2frhh) ## Description of the data and file structure All data was collected from published paper by searching "soil particulate organic carbon" at Web of Science and Google Scholar.  We derived the data points from tables involving soil POC and/or extracted from figures vis the Engauge Digitizer software version 10.7. Climate, edaphic, and microbial data not mentioned in papers were extracted from global datasets following our previous studies. SOC, TC, and BD were downloaded from the Harmonized World Soil Database (HWSD, [https://daac.ornl.gov/cgibin/dsviewer.pl?ds_id=1247](https://daac.ornl.gov/cgibin/dsviewer.pl?ds_id=1247)) at a 0.05° × 0.05° resolution grid. Soil C, BD, and TN were extracted from the IGBP-DIS dataset (IGBP, [https://daac.ornl.gov/SOILS/guides/igbp-surfaces.html](https://daac.ornl.gov/SOILS/guides/igbp-surfaces.html)) at a spatial resolution of 0.5′ × 0.5′. MAT and MAP were obtained from the WorldClim database version 2 with a spatial resolution of 30 seconds during 1970 – 2000 ([https://www.worldclim.org/data/worldclim21.html](https://www.worldclim.org/data/worldclim21.html)). Missing data are entered as Na. ### Files and variables #### File: POC\_0\_100cm.csv **Description:**  ##### Variables * ID: Original Sample ID * NO.: Sample ID * Country: * bd_igbp (g cm-3): Bulk Density from igbp * tn_igbp (g kg-1): total nitrogen from igbp * tc_igbp (g kg-1): total carbon from igbp * CN ratio: carbon :nitrogen ratio * tc_hwsd (kg C m-2): total carbon from hwsd * soc_hwsd (%): soil organic carbon from hwsd  * soc_hwsd (g/kg): soil organic carbon from hwsd * SM_yearly (v/v): mean annual soil moisture   * sand (%):  * Cden_bel (kg m-2): root carbon density * pH: * NPP (g m-2 yr-1): net primarily productivity * MAP (mm): mean annual precipitation  * MAT (deg C): man annual temperature * clay (%): * silt (%): * bd_hwsd (g cm-3): bulk density from hwsd * ST_yearly (deg C): mean annual soil temperature * porosity_bottom:  * porosity_midlayer: * porosity_toplayer: * Biome S: * Lat F: latitude * Long F: longitude * Sand F: * Silt F: * Clay F: * BD F: * Porosity F: * SM F: * TOC g/kg F: * SOC g/kg F: * TN g/kg F: * pH F: * C/N F: * POC Sample Type: soil type * iPOC Total(g/kg_53-2000): POC standardized via igbp  * hPOC Total(g/kg_53-2000): POC standardized via hwsd * Group T: group * POC Calcul F: * POC Fractions: * POC Value Type F: * POC Covert: * Date F: * Depth F: * Reference: * Method POC_C: * Method POC: * Method F: #### File: POC\_topsoil.csv **Description:**  ##### Variables * ID_corri: * NO.: * Site: * Country: * bd_igbp (g cm-3): * tn_igbp (g kg-1): * tc_igbp (g kg-1): * CN ratio: * tc_hwsd (kg C m-2): * tc_hwsd (g/kg): * soc_hwsd (%): * SM_yearly (v/v): * sand (%): * Cden_bel (kg m-2): * pH: * NPP (g m-2 yr-1): * MAP (mm): * MAT (deg C): * clay (%): * silt (%): * bd_hwsd (g cm-3): * ST_yearly (deg C): * porosity_bottom: * porosity_midlayer: * porosity_toplayer: * Biome S: * Lat F: * Long F: * MAT F: * MAP F: * Sand F: * Silt F: * Clay F: * BD F: * Porosity F: * SM F: * TOC g/kg F: * SOC g/kg F: * TOC g/kg: * TN g/kg F: * pH F: * C/N F: * POC Sample Type: * iPOC Total(g/kg_53-2000): * hPOC Total(g/kg_53-2000): * Group T: * Flotation: * POC Calcul F: * POC Fractions: * POC Value Type F: * POC Covert: * Treatment Type F: * Date F: * Depth F: * Reference: * Method POC_C: * Method POC: * Method F: * POC-iTC: ## Code/software Engauge Digitizer software version 10.7 ([http://digitizer.sourceforge.net/](http://digitizer.sourceforge.net/))  Scikit-learn packages (version 0.23.2, [https://scikit-learn.org](https://scikit-learn.org)) for Python (version 3.7.5, [https://www.python.org/](https://www.python.org/)) RStudio software version 4.0.3 ([http://www.rstudio.com/](http://www.rstudio.com/)) ORIGIN Pro 2023 ([http://www.originlab.com/](http://www.originlab.com/)) ArcGIS software (version 10.8, ESRI, Redlands, CA)