A multi-isotope model for simulating soil organic carbon cycling on an eroding landscape (WATEM_C v1.0) [post]

Zhengang Wang, Kristof Van Oost
2019 unpublished
<p><strong>Abstract.</strong> There is increasing recognition that lateral soil organic carbon (SOC) fluxes due to erosion have imposed an important impact on the global C cycling. Field and experimental studies have been conducted to investigate this topic. It is useful to have a modelling tool that takes into account various soil properties and has flexible resolution and scale options, so that it can be widely used to study relevant processes and evaluate the effect of soil
more » ... the effect of soil erosion on SOC cycling. This study presents a model that is capable of simulating SOC cycling on a dynamic landscape. It considers all the three C isotopes (<sup>12</sup>C, <sup>13</sup>C and <sup>14</sup>C) with flexible time step and vertical solution of the soil profile. The model gives a 3D representation of soil properties such as <sup>137</sup>Cs activity, SOC stock, and δ<sup>13</sup>C and Δ<sup>14</sup>C values. Using the same C cycling processes in stable, eroding and depositional areas, our model is able to reproduce the observed spatial and vertical patterns of C, δ<sup>13</sup>C values and Δ<sup>14</sup>C values. This indicates that physical soil redistribution is the main cause of the spatial variability of these C metrics.</p>
doi:10.5194/gmd-2019-217 fatcat:et5gr2lgqbcd5jf3fizj52a4li