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INRA
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

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Amendment network

Network and its devices names
Amendment network
Localisation
Coordination : Champenoux, 54280, France
Sites localisées en France métropolitaine
Website
https://www6.nancy.inra.fr/bef
Network description

This network includes about thirty devices spread throughout France. Different species are represented (oak, beech, spruce, fir, Douglas fir, pine), several of which may be present on the same system. The age of the stands when the trials are set up varies greatly, as do the products used (fertilizers, Ca or Ca-Mg carbonates, gypsum, slag, etc.) and the doses administered (from a few dozen kg to several tonnes per hectare). The area covered by each device varies from 1 to 6 hectares, depending on the methods applied, the number of blocks and the size of the unit plots (from 0.01 to 1 ha).


When installed (prior to the amendments), the devices have generally been subject to a formal "initial condition".  They were then measured more or less regularly depending on the technical, human and financial resources available to carry out sampling campaigns and physico-chemical analyses (soil, humus, population).The frequency of measurements therefore often varies from one to another and according to the parameters monitored (linked to the initial objectives and successive scientific projects related to the devices).

Different compartments of the ecosystem are concerned (soil, humus, tree and in particular leaves/needles, herbaceous stratum, etc.). The effects of the products on the ecosystem can be deduced from comparisons between the plots having received the fertiliser product and the control plots (ecosystem similar in all respects, but without input). The evolution of the compartments and the ecosystem can then be studied by comparing the measurements or scores recorded during the successive campaigns.

The most commonly performed determinations are: (i) chemical analyses of soils, horizon by horizon (pedological or systematic), (ii) chemical analyses of humus and evaluation of the quantities of dry matter per hectare, (iii) chemical analyses of leaves or needle, (iv) inventories in the middle of the stands, (v) species inventories for the tree, shrub, herbaceous and moss strata, and (vi) biomass-mineralomass of the stands on a few devices.

Services offer

Data collected from all sites is centralized and available for use in collaborative projects.

Team

The network is managed by the staff of the Biochemistry of Forest Ecosystems "BEF" unit (INRA Grand Est Nancy): a research officer for the scientific aspects and a field technician for the technical aspects. The collection of samples is carried out by BEF staff. Sample preparation and analysis are carried out in the BEF laboratory by an assistant engineer and a technician.

Work description and access modalities

The work consists of the collection of samples (soil, humus, plants), pre-treatment and/or analysis of the samples. Our approach is to interact as much as possible with the user(s) to discuss all aspects of their project. These discussions allow an individual treatment of each request and to adapt the support to the request. We mainly offer scientific, technical and logistical support. It is possible to use ANAEE-France's mobile platform (MPOETE) as additional support for field campaigns, experiments and data acquisition.

Access unit and cost

The unit access will be defined according to research projects or applications. During a project/access, we can offer access to the Amendment Network sites, associated data and the various solid samples collected since the installation of the plots. For each access unit, we also offer the possibility of access to a laboratory space for sample preparation and processing. The cost of an access unit will be defined according to research projects or requests.

Facilities

The majority of the plots do not have permanent instrumentation. Some plots in the network have nevertheless been heavily instrumented to become instrumented experimental in-situ sites (Potées, Breuil-Chenue, Fougères) whose main objective is to study biogeochemical cycles at the ecosystem scale. These plots are instrumented with soil moisture probes, litter collectors, porous candles and/or lysimetric plates, rainfall and trunk runoff collectors.