Know more

Our use of cookies

Cookies are a set of data stored on a user’s device when the user browses a web site. The data is in a file containing an ID number, the name of the server which deposited it and, in some cases, an expiry date. We use cookies to record information about your visit, language of preference, and other parameters on the site in order to optimise your next visit and make the site even more useful to you.

To improve your experience, we use cookies to store certain browsing information and provide secure navigation, and to collect statistics with a view to improve the site’s features. For a complete list of the cookies we use, download “Ghostery”, a free plug-in for browsers which can detect, and, in some cases, block cookies.

Ghostery is available here for free:

You can also visit the CNIL web site for instructions on how to configure your browser to manage cookie storage on your device.

In the case of third-party advertising cookies, you can also visit the following site:, offered by digital advertising professionals within the European Digital Advertising Alliance (EDAA). From the site, you can deny or accept the cookies used by advertising professionals who are members.

It is also possible to block certain third-party cookies directly via publishers:

Cookie type

Means of blocking

Analytical and performance cookies

Google Analytics

Targeted advertising cookies


The following types of cookies may be used on our websites:

Mandatory cookies

Functional cookies

Social media and advertising cookies

These cookies are needed to ensure the proper functioning of the site and cannot be disabled. They help ensure a secure connection and the basic availability of our website.

These cookies allow us to analyse site use in order to measure and optimise performance. They allow us to store your sign-in information and display the different components of our website in a more coherent way.

These cookies are used by advertising agencies such as Google and by social media sites such as LinkedIn and Facebook. Among other things, they allow pages to be shared on social media, the posting of comments, and the publication (on our site or elsewhere) of ads that reflect your centres of interest.

Our EZPublish content management system (CMS) uses CAS and PHP session cookies and the New Relic cookie for monitoring purposes (IP, response times).

These cookies are deleted at the end of the browsing session (when you log off or close your browser window)

Our EZPublish content management system (CMS) uses the XiTi cookie to measure traffic. Our service provider is AT Internet. This company stores data (IPs, date and time of access, length of the visit and pages viewed) for six months.

Our EZPublish content management system (CMS) does not use this type of cookie.

For more information about the cookies we use, contact INRA’s Data Protection Officer by email at or by post at:

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

Dernière mise à jour : Mai 2018

Menu Logo Principal IN-SYLVA France ONF FCBA CIRAD CNPF OFB Université de Rouen

Home page

LERFOB Network: LerFob Experimental Silvicultural Network

Network name
LERFOB Network: LerFob Experimental Silvicultural Network
Coordination : Champenoux, 54280, France

Réseau LerFob

Maps of "LerFob" network experimental sites (active and completed) distributed by group: hardwoods (left) and softwoods (right) and grouped by forest.

Network description

The LerFob network is a network of permanent silvicultural plots in regular high forests, the oldest of which were installed in 1883. This network includes comparison tests of thinning intensities.

This network is unique in France in terms of the very long duration of its monitoring and measurement campaigns (all the trees are numbered and have been individually surveyed since measurements became practicable in the stands). The oldest individual circumference records date back to 1904.

There are still active sites in 21 forests in the northern half of France, for a total of 434 plots and a surface area of nearly 110 hectares. For the most part (more than 3/4 of the active experimental areas), these plots concern sessile oak and beech.

The oldest part of these Beech and Oak networks was created in 2 periods.

For beech, in 1883, a set of plots was installed in the forest of The Hague (Meurthe-et-Moselle) in pure beech or mixed beech-oak stands about 30 years in age. Then, from 1922 to 1924, 3 other sets of plots were installed in the forests of Retz (Aisne), Darney (Vosges) and Eawy (Seine-Maritime) in pole or young stands from 35 to 60 years in age; at the same time, single plots in older forest stands of various ages (100 to 160 years) were also installed.

The oak network was installed between 1925 and 1934 in the forests of Bellême (Orne), Blois (Loir-et-Cher), Champenoux (Meurthe-et-Moselle) and Tronçais (Allier).

Today, the entire network, including the active plots and those that have come to an end or disappeared (due to climatic events such as storms), comprises 1070 plots for a total area of nearly 410 hectares in 75 forests. In the past, the network covered a much wider range of species than today. In particular, softwoods (spruce, fir, Douglas fir) accounted for half of the area.

The network provides active experimental sites and is a source of experimental data.

Nearly all of the experimental sites are located in public forests. For hardwoods, the origin of the stands is mainly natural regeneration.

Services offer

  • Compilation of experimental data

The data recorded on all the trees in the permanent plots of the network mainly concern circumference measurements and health status, though one plot provides measurements of total stand height.

The inventories are carried out regularly (usually every 3 to 5 years). In the most recent experiments, the time steps can even be annual.

Depending on the subject of the studies, other measurements are added to the periodic inventories. For example, crown characteristics like branch heightor crown projection) and new technologies such as terrestrial Lidar may be applied.

The Experimental Growth Facility team is in charge of capturing and harmonizing the data files of the active and non-active experimental sites.

  • Support for setting up new experiments at the network sites within the framework of projects involving the Silva Team (INRAE).

Network management (i.e. monitoring protocol, data archiving, and design of measurement tools) is entrusted to the Experimental Growth Facility.

This team is composed of 4 permanent staff members, an assistant engineer and 3 technicians, under the responsibility of a research engineer. It is responsible for the dendrometric measurements on trees and in the forest stands, stem analysis, retrospective analyses based on annual growth rings, analysis of tree shapes and volumes (terrestrial LIDAR technology), and pedological and ecological surveys.

Work description

Access to the network's experimental sites and data is available to researchers from other teams, to answer research or technical questions, within the framework of formal collaborations (collaborative projects or research agreements).

There are no restrictions on access to the experimental sites except in the very rare cases where they are located in private forests.

Access unit and cost

Variable according to demand, with a case-by-case analysis of costs, for data editing and technical support in the field or laboratory.


No particular equipment