SoilGen model

SoilGen is a (1-D) simulation model for the study of pedogenesis in various parent materials. Whereas most soil genetic studies take observations in the present to reconstruct soil development in the past, this model takes an initial soil or parent material as starting point and calculates the effect of various boundary conditions over long periods on soil development. Thus, Jenny’s paradigm is followed, which states that the soil we observe today is a function of the “factors of soil formation” CLORPT (CLimate, Organisms, Relief, Parent material and Time). All these factors are treated as boundary - or initial - conditions whereas the soil forming processes are part of the simulation model.

So far, SoilGen was applied onto loess, cover sand, marine clay, weathering residuum and volcanic ash on sites in Belgium, France, Norway, China, Cameroon, U.S.A., Indonesia.

SoilGen contains the processes physical weathering, chemical weathering, clay migration, (de-)calcification and (de-)gypsification, C-cycling and can deal with the effects of bioturbation, erosion, deposition, agricultural practices (fertilization, plowing, slash&burn) and several vegetation types. Podzolisation is not (yet) included. Fate of the elements C, Ca, Mg, Al, K, Na, Cl, H and S(ulphate) is simulated, and that of Fe, Si and Be is work in progress.


Processes simulated in SoilGen2

SoilGen has been applied in a number of case studies:

· Finke and Hutson (2008) applied SoilGen1.1 to evaluate the effect of late-glacial to Holocene climate transitions on Hungarian and Belgian loess soils with special emphasis on the effect of bioturbation (climosequence research) (SoilGen1.1)

· Finke (2012) applied it to a toposequence in loess in Belgium (SoilGen2.16);

· Sauer et al (2012) applied it on two chronosequences in marine terraces in Norway (SoilGen2.16);

· Yu et al (2013) calibrated the organic C-module for Chinese and Belgian loess forest soils; (SoilGen2.16);

· Zwertvaegher et al, (2010) and Zwertvaegher et al. (2013) applied it on 96 locations in a coversand area to reconstruct soilscapes at prehistoric times in an archaeological context (SoilGen2.18);

· Finke et al. (2013) applied it on 108 locations in highly variable loess soils to assess effects of terrain controls and treefalls on spatial patterns of soil horizons (SoilGen2.16).

· Finke et al. (2015) calibrated and applied it on Loess soils under agriculture with special emphasis on lessivage (clay migration) (SoilGen2.24). Collaboration with INRA France;


Ongoing studies:

· Conversion of SoilGen to the VSoil modelling platform (PhD-project Saba Keyvanshokouhi, INRA France)

· Uncertainty analysis of model-based landscape reconstruction for prehistoric land evaluation (collaboration with Azam Jafari, Kerman University Iran);

· Calibration and application on Holocene palaeosoils in the Chinese loess with special emphasis on the soil C (Collaboration with IGG-CAS China);

· Improvement of the model description of mineral weathering and extension of the chemical module (PhD-project Emmanuel Opolot, BELSPO-project).

· Application onto MIS5e and MIS13 paleosoils in the Chinese loess area (Collaboration with UCL-Qiuzhen Yin).

· Calibration of separate organic carbon pools over a soil chronosequence in California and linkage to soil mineralogy (with Sebastian Doettrl a.m.o.)



Recent changes to Soilgen

Added functionality in SoilGen2.24:

· Calculation of weathering indices as time/depth-diagrams (with Emmanuel Opolot)

· Plowing depth and plowing intensity as non-mandatory annual inputs

· Measured Van Genuchten parameters as non-mandatory annual layer input

· Sequential runs are possible (for analysis of diverging scenarios after year X)

· Calculation of Δ14C and estimation of Conventional Radiocarbon Age BP as time/depth-diagrams (thanks to Jerôme Balesdent and Christine Hatté)

· Tillage variants: Inversion plowing and harrowing

· Slash and burn events: input% of ectorganic matter that converts into IOM, HUM and atmosphere

· Choice for either Richards equation or Addiscott mobile/immobile capacity system

· Optional daily outputs (for selected variables)

· Removed bug for sequential/continuation run

In SoilGen2.25:

· Improved routines for weathering of (19) minerals (with Emmanuel Opolot)

In development:

· Routines for newformation of minerals

· Behaviour of atmospheric 9Be/10Be




· SoilGen1.1 and SoilGen2.16 still available on request.

· SoilGen2.24 here (last build: 19/4/2016) and its user manual (2.24) here. I appreciate a mail if you’re using it.

· SoilGen2.25 here (build 22/3/2017): detailed mineral weathering

· Most recent version of output viewer (TDGraph) here

· Most recent version of (nonglossy) postprocessor (PostProc) here.

· A summary of data demands here.



Peer-reviewed publications on soilgen

* Finke, P.A. and J. Hutson. 2008. Modelling soil genesis in calcareous löss. Geoderma 145 : 462-479.

* Finke, P.A, 2012. Modeling the genesis of Luvisols as a function of topographic position in loess parent material. Quaternary International  265: 3-17.

* Daniela Sauer, Peter A. Finke, Isabelle Schülli-Maurer, Ragnhild Sperstad, Rolf Sørensen, Helge I. Høeg, Karl Stahr. 2012. Testing a soil development model against southern Norway soil chronosequences. Quaternary International 265: 18-31.

* Yu, Y.Y., Finke, P.A, Guo, Z.T, Wu H. B., 2013. Sensitivity analysis and calibration of a soil carbon model (SoilGen2) in two contrasting loess forest soils. Geoscientific Model Development 6, 29-44.

* Zwertvaegher, Ann, Peter Finke, Philippe De Smedt, Vanessa Gelorini, Marc Van Meirvenne, Machteld Bats, Jeroen De Reu, Marc Antrop, Jean Bourgeois, Philippe De Maeyer, Jacques Verniers, Philippe Crombé. 2013. Spatio-temporal modeling of soil characteristics for soilscape reconstruction. Geoderma 207-208: 166-179.

* Finke, P.A., T. Vanwalleghem, E. Opolot, J. Poesen, J. Deckers. 2013. Estimating the effect of tree uprooting on variation of soil horizon depth by confronting pedogenetic simulations to measurements in a Belgian loess area. Journal of Geophysical Research - Earth Surface 118 (4): 2124–2139 .

* Opolot  E., Y.Y. Yu and P.A.Finke. 2015.  Modeling soil genesis at pedon and landscape scales: achievements and problems. Quaternary International 376: 34-46 . 

* Finke, P., Samouëlian, A., M. Suarez-Bonnet, B. Laroche and Cornu S. 2015.  Assessing the usage potential of SoilGen2 to predict clay translocation under forest and agricultural land uses. European Journal of Soil Science 66(1): 194-205. 

* Budiman Minasny, Peter Finke, Uta Stockmann, Tom Vanwalleghem, and Alex McBratney. 2015. Resolving the integral connection between pedogenesis and landscape evolution. Earth Science Reviews 150: 102-120. 

* Opolot, E., Finke, P.A. 2015. Evaluating sensitivity of silicate mineral dissolution rates to physical weathering using a soil evolution model (SoilGen2.25). Biogeosciences 12: 6791-6808.

* Keyvanshokouhi,S., Cornu S., Samouëlian A.,  Finke. P. 2016. Evaluating SoilGen2 as a tool for projecting soil evolution induced by global change. Science of the Total Environment 571: 110–123 . 



SoilGen is a research model and so far it has been applied on 100’s of scenarios and sites . For non-plausible inputs (and peat soils, clay soils and some sandy soils) SoilGen may provide nonsults and might leave your PC in distress. Opolot et al. (2015) give an application domain.


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