Know more

About cookies

What is a "cookie"?

A "cookie" is a piece of information, usually small and identified by a name, which may be sent to your browser by a website you are visiting. Your web browser will store it for a period of time, and send it back to the web server each time you log on again.

Different types of cookies are placed on the sites:

  • Cookies strictly necessary for the proper functioning of the site
  • Cookies deposited by third party sites to improve the interactivity of the site, to collect statistics

Learn more about cookies and how they work

The different types of cookies used on this site

Cookies strictly necessary for the site to function

These cookies allow the main services of the site to function optimally. You can technically block them using your browser settings but your experience on the site may be degraded.

Furthermore, you have the possibility of opposing the use of audience measurement tracers strictly necessary for the functioning and current administration of the website in the cookie management window accessible via the link located in the footer of the site.

Technical cookies

Name of the cookie


Shelf life

CAS and PHP session cookies

Login credentials, session security



Saving your cookie consent choices

12 months

Audience measurement cookies (AT Internet)

Name of the cookie


Shelf life


Trace the visitor's route in order to establish visit statistics.

13 months


Store the anonymous ID of the visitor who starts the first time he visits the site

13 months


Identify the numbers (unique identifiers of a site) seen by the visitor and store the visitor's identifiers.

13 months

About the AT Internet audience measurement tool :

AT Internet's audience measurement tool Analytics is deployed on this site in order to obtain information on visitors' navigation and to improve its use.

The French data protection authority (CNIL) has granted an exemption to AT Internet's Web Analytics cookie. This tool is thus exempt from the collection of the Internet user's consent with regard to the deposit of analytics cookies. However, you can refuse the deposit of these cookies via the cookie management panel.

Good to know:

  • The data collected are not cross-checked with other processing operations
  • The deposited cookie is only used to produce anonymous statistics
  • The cookie does not allow the user's navigation on other sites to be tracked.

Third party cookies to improve the interactivity of the site

This site relies on certain services provided by third parties which allow :

  • to offer interactive content;
  • improve usability and facilitate the sharing of content on social networks;
  • view videos and animated presentations directly on our website;
  • protect form entries from robots;
  • monitor the performance of the site.

These third parties will collect and use your browsing data for their own purposes.

How to accept or reject cookies

When you start browsing an eZpublish site, the appearance of the "cookies" banner allows you to accept or refuse all the cookies we use. This banner will be displayed as long as you have not made a choice, even if you are browsing on another page of the site.

You can change your choices at any time by clicking on the "Cookie Management" link.

You can manage these cookies in your browser. Here are the procedures to follow: Firefox; Chrome; Explorer; Safari; Opera

For more information about the cookies we use, you can contact INRAE's Data Protection Officer by email at or by post at :


24, chemin de Borde Rouge -Auzeville - CS52627 31326 Castanet Tolosan cedex - France

Last update: May 2021

Menu Logo Principal Logo SAS Logo de l'Institut Agro Rennes-Angers

Home page

WALTER Christian


Professor at l'Institut Agro, Director of SAS research unit, Corresponding member of the French Academy of Agriculture

Phone: (+33) 2 23 48 54 39


Address: Institut Agro, UMR SAS, 65 rue de St-Brieuc, CS 84215, 35042 Rennes Cedex, France

Fields of expertise: soil science, spatial analysis, agronomy

Keywords: soil quality, soil mapping, digital soil mapping, spatial analysis, ecosystem services



Since 2019, I have served as the Director of the Soil, Agro-hydrosystems and Spatialisation research unit.

My personal research is focused on spatial and temporal variations of soils and analysis of impacts of agricultural production systems on soil quality. I now perform research activities through supervision of Ph.D. and Master’s students or through daily collaboration with members of the research unit.

Current research topics
  • Quantitative methods of spatial soil analysis
  • Soil quality in agrosystems
  • Carbon dynamics in soils
  • Environmental assessment
Current Projects
  • SOILSERV: Multiscale assessment of ecosystem services within agroecosystems (2016-2021)
  • PHC Utique IPASS: Identification of agricultural practices and soilmonitoring using remote sensing in temperate and semi-arid conditions (2020-2023)
  • EJPSOIL: Towards climate-smart sustainable management of agricultural soils (2020-2025)
Participation in networks
  • International Union of Soil Sciences (IUSS)
  • Pedometrics commission and Digital Soil Mapping Working Group of the IUSS, French National Society of Soil Science (AFES)
  • French Academy of Agriculture

Teaching experience

I provide a full teaching service from the L3 level to the M2 level in the agricultural engineering course, the master of Water Sciences, co-accredited with Rennes University, and a professional “licence” degree.
My teaching themes focus on fundamentals of soil, soil as a medium for agricultural production and interface in the environment and soil spatial-analysis approaches.
I am also involved in continuing education and coordinate a doctoral school on assessment of ecosystem services provided by soils.



Ado, M.N., Michot, D., Guero, Y., Walter C. (2019) - Echinochloa stagnina improves soil structure and phytodesalinization of irrigated saline sodic Vertisols. Plant soil (2019) 434: 413.

Aichi H., Fouad Y., Chabaane Zl, Sanaa M, Walter C. 2018 – Prediction accuracy of local and regional soil total carbon models, calibrated based on visible -near infrared spectra, in Djerid arid region. Journal of Near Infrared Spectroscopy,

Arrouays, D., Richer de Forges, A., McBratney, A. B., Hartemink, A. E., Minasny, B., Savin, I. Grundy, M., Leenaars, J. G. B., L. Poggio, Roudier, P., Libohova, Z., McKenzie, N. J., van den Bosch, H., B. Kempen, Mulder, V. L., Lacoste, M., Chen, S., Saby, N., Martin, M., Roman Dobarco, M., Cousin, I., Loiseau, T., Lehmann, S., Caubet, M., Lemercier, B., Walter, C., Vaudour, E., Gomez, C., Martelet, G., Krasilnikov, P., Lagacherie, P. (2018). The globalsoilmap project; past, present, future, and national examples from France. Bulletin of Soil Science Institute (Russie), 95, 22 p. , DOI : 10.19047/0136-1694-2018-95-3-23

CHEN S., MARTIN M., SABY N,, WALTER C., ANGERS D., ARROUAYS. 2018 - Fine resolution map of top- and subsoil carbon sequestration potential in France. Science of the Total Environment, vol. 630,  p. 389-400.

Chen, S., Arrouays, D., Angers, D., Chenu, C., Barré, P., Martin, M., Saby, N., Walter, C. (2019). National estimation of soil organic carbon storage potential for arable soils: A data-driven approach coupled with carbon-landscape zones. Science of the Total Environment, 666, 355-367., DOI: 10.1016/j.scitotenv.2019.02.249

Ellili Y., C. Walter, B. Lemercier, D. Michot, P. Pichelin 2019 - Mapping soil organic carbon stock change by soil monitoring and digital soil mapping at the landscape scale. Geoderma, 351(1-8),

Félix-Faure J., C. WalterJ. Balesdent, V. Chanudet, J. Avrillier, C. Hossann, E. Dambrine. (2019) - Soils drowned in water impoundments: a new frontier. Frontiers in Environmental Sciences,

Fossey M, Angers D, Bustany C, Cudennec C, Durand P, Gascuel-Odoux C, Jaffrezic A, Pérès G, Besse C and Walter C (2020) - A Framework to Consider Soil Ecosystem Services in Territorial Planning. Front. Environ. Sci. 8:28.

Lacoste M; Viaud V., Michot D., Walter C. 2016 - Model-based evaluation of impact of soil redistribution on soil organic carbon stocks in a hedgerow landscape under temperate hedgerow landscape. Earth Surface Processes and Landforms, 41, 1536–1549,

Nitschelm L, Aubin J., Corson M., Viaud V., Walter C.  2016 - Spatial differentiation in LCA applied to an agricultural territory: current practices and method development. Journal of Cleaner Development, 112, 2472-2484. 10.1016/j.jclepro.2015.09.138

R.A. Viscarra Rossel, T. Behrens, E. Ben-Dor, D.J. Brown, J.A.M., Dematte, K.D. Shepherd , Z. Shi, B. Stenberg, A. Stevens, V., Adamchuk, H. Aichi, B.G. Barthes, H.M. Bartholomeus, A.D. Bayer, M. Bernoux, K. Bottcher, L. Brodsky, D. Changwen, A. Chappell, Y. Fouad, V. Genot, C. Gomez, S. Grunwald, A. Gubler, C. Guerrero Maestre, C. B. Hedley, M. Knadel, H.J.M. Morras, M. Nocitaa, L. Ramirez-Lopez, P. Roudier, E.M. Rufasto Camposa, P. Sanborna, V.M. Sellittoa, K.A. Suddutha, B.G. Rawlinsa, C. Walter, L.A. Winowieckia, S. Young Honga, W. J. 2016 - A global spectroscopic library to characterize the world's soil. Earth Science Reviews, 1,55, 198-230, (elected Best paper in Pedometrics, 2016 by the Pedomettrics Commission of the International Union of Soil Science)

Tete E., Viaud V., Walter C. 2015 -  Organic carbon and nitrogen mineralization in a poorly-drained mineral soil under transient waterlogged conditions: an incubation experiment. European Journal of Soil Science, 66, 427–437,

See also

All productions by Christian WALTER in HAL

Academic accounts: