Soil Organic Carbon depth profiles in relation to topographic parameters

We have to understand the spatial dynamics (horizontally and vertically) of the store of the Soil Organic Carbon (SOC) to manage soil resource. At large scale, a broad range of parameters is typically required. But regarding a smaller scale the bedrock and soils types are more homogenous. This study aims to characterize the relation of the vertical distribution of SOC content and the topography at the farm scale. For that, we sampled 19 cores up to 1m depth in different topographical contexts. We measured by spectroscopy the SOC content each 3cm along the core to establish a high resolution vertical distribution which we summa-rized by fitting of a cubic function. We show that these parameters are well explained by the slope and curva-ture (mean R² c. 0.5 for all parameters). These correlations were used to map the SOC content at GlobalSoil-Map depth layers