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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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Douglas-Biochemistry network

Network and its devices names
Douglas-BGC network
Coordination : Champenoux, 54280, France
Sites located in metropolitan France
Network description

The Douglas-BGC network includes around 30 experimental sites, 11 of which are instrumented for continuous monitoring of water flows and major elements at the forest plot scale.

All the sites have been observed and characterized with respect to land use history, herbaceous vegetation, settlement, soils and climate. The monitoring carried out from 2013 to today on the 11 instrumented sites includes continuous monitoring of soil moisture, litterfall, rainfall, trunk runoff and soil solutions collected at 15 cm and 60 cm depth by porous candles. For each liquid sample the pH and the concentrations of anions (F, NO2, NO3, SO4, CL, H2PO4), cations (NH4) and total elements in Si, Al, Fe, S, P, K, Ca, Na, Mg, Mn are measured. On all sites, the physical and chemical properties of the soils as well as the major element reserves in the stand biomass were determined. Concerning the nitrogen cycle, mineralization and potential nitrification were measured at all sites; in parallel, NO3 and NH4 fluxes were measured in the soils of the 11 sites instrumented with anionic and cationic resins, every two months for one year. All information is recorded in a database that includes raw and processed data and metadata.

Services offer

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


The network is managed by BEF (Biogeochemistry of forest ecosystems INRAE Grand Est Nancy) staff: one research engineer and one research officer for the scientific aspects, and one design engineer for the technical aspects (including database management).
 Sample collection is carried out by volunteers, owners, ONF and CRPF staff and occasionally by BEF staff. Sample preparation and analysis is carried out at the BEF laboratory by a design engineer and a technician.

Work description and access modalities

The work consists of the collection of samples (soil, 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. This step allows for 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 of access will be defined according to research projects or applications. During a project/access, we can offer access to Douglas network sites and associated data. 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.


For the 11 instrumented sites: Decagon soil moisture probes (10 probes per site, 5 at -15cm, 5 at -60cm), porous candles (10 candles per site, 5 repeats at -15cm, 5 repeats at -60cm), vacuum pump, litter collectors (4 per site), rainfall collectors (4 per site), trunk runoff collectors (4 per site).