Below is a user manual for scientists who want to reproduce the results provided by Pichancourt et al., (XXX to be added when accepted for submission)

• Step 1 - Download and install the supply chain software as a Java bin: https://sourceforge.net/p/lerfobforesttools/wiki/CAT/

• Step 2 - Run the supply chain software and open forest growth simulations: https://sourceforge.net/p/lerfobforesttools/wiki/CAT%20-%20User%20interface/ The user needs to import the first growth simulation (representing the business-as-usual harvesting scenario S1) from this link below:

• Step 3 - Open the supply chain model of silver fir for the Grand-Est region, and run the simulations The supply chain model of silver fir for the Grand-Est region can be downloaded in the folder 1. The user can understand how to use the flux manager module in order to open or design a forestry supply chain, by following this link: https://sourceforge.net/p/lerfobforesttools/wiki/CAT%20-%20Flux%20Manager/ If needed, the results of this step based on the first growth simulation scenario can already be found here:

Step 4 - Redo Step 2 and 3 but now with this second growth simulation (low intensity harvesting scenario S2): If needed, the results of step 4 generated with this second growth simulation can already be found here:

Step 5 - Redo Steps 2 and 3 but now then with this third growth simulation (high intensity harvesting scenario S3): If needed, the results of step 5 generated with this third growth simulation can already be found here:

Step 6 - Open saved files with Chemical accounting tool and run it to produce figures used in the manuscript. All the files of the chemical module can be found here:

The MAIN_RUNFIRST.R is the one that needs to be openned to run all the others. Be aware that files generated in steps 3, 4 and 5 are used. It is thus better to check the location of the files based on what is specified in the R files MAIN_RUNFIRST.R and Data_Extraforest.R. Also the names of the files generated from steps 3, 4 or 5 must be of this form of name: "S1" + "Abies" +"CarbonStockAndFluxEvolution"+ extension ".csv"

NB1: access the GIS model, forest growth model and NFI data GIS model and data can be found using the following temporary link provided by the IGN ( French National Institute of Geographical and forest Information): http://extraforest.ign.fr/. To access the GIS website, a temporary login and password can be asked by sending an email to the project leader

NB2: access the original chemical data Raw chemical data can be accessed on demand by sending an email to the project leader