Tomislav Hengl

#SoilOrganicCarbon (organic matter / plant and animal residues at various stages of decomposition) is one of the key indicators of hashtag#soilhealth / soil ecosystem services. But how do you measure and report SOC? We advocate that SOC density [kg/m3] is the central variable to monitor SOC dynamics. It is derived by measuring SOC content and Bulk density (separately) and then by a simple formula:

SOC [kg/m3] = SOC [dg/kg]/100 * BD [kg/m3] * (1-CF)

*CF is the coarse fragments fraction (0-1).

Mar 21, 2025 at 11:47amWeb
Show threadTomislav HenglMar 21, 2025
In summary, there are four main variables used to represent SOC:
1. SOC fraction or content (ORC) in g/kg (permille) or dg/kg (%),
2. SOC Density (OCD) in kg/m3
3. SOC Stock (OCS) in kg/m2 or in t/ha and for the given soil depth interval,
4. Total SOC Stock (TOCS) in million t or Pg,
To enable anyone to produce better land managment plans, @ai4soilhealth
project is producing SOC density data at high spatial resolution in 3D+T for the whole pan-EU (https://doi.org/10.21203/rs.3.rs-5128244/v1).
Spatiotemporal prediction of soil organic carbon density for Europe (2000--2022) in 3D+T based on Landsat-based spectral indices time-series

The paper describes a comprehensive framework for soil organic carbon density (SOCD) (kg/m3) modeling and mapping, based on spatiotemporal Random Forest (RF) and Quantile Regression Forests (QRF). 22,428 SOCD measurements and a wide range of covariate layers—particularly the 30m Landsat-based ...

Show threadTomislav HenglMar 21, 2025
To learn more about SOC monitoring and how to access #OpenData on SOC, join us at the #SoilHealthNow https://2025.ai4soilhealth.eu conference in Wageningen, April 8-11 2025.
Soil Health Now - European Conference 8–10 April 2025, Wageningen International Conference Center (WICC), Wageningen

A 3-day international conference with keynotes, discussion forums, oral talks, workshops and demonstrations + fieldwork