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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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15N network

Network and its devices names
15N network
Champenoux, 54280, France; sites en France, en Europe (Allemagne, Italie, Denmark), en Brazil, en Afrique (Congo) et en Sibérie
Network description

The objective of the 15N network is to monitor for several decades the evolution of nitrogen in the soil-plant litter continuum and thus identify the mechanisms controlling nitrogen turnover in forest ecosystems.

Currently, the network consists of 20 sites. The starting point is the deposition on the ground of a litter highly enriched in 15N on surfaces of several m2. This deposit is substituted in quantity and in chemical and biochemical quality for the natural fall of litter. The treated plots are then compared with the control plots. Since the introduction of tracing in the early 2000s, soil samples (organic and mineral) and plant samples (roots, mycorrhizae, leaves, litter, wood) have been taken and analysed. All samples are stored under adequate conditions. The data are stored in a database.

Services offer

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


The network is managed by a research engineer and an assistant engineer for analysis and database management. Sample collection is carried out by the research engineer, technicians and students. In parallel, the research unit offers scientific knowledge in biogeochemistry in forest ecosystems, mainly on C, N and cation cycles. We regularly welcome international students and researchers.

Work description and access modalities

The average time spent using the infrastructure on a research project is one week. The work consists of sample collection (soils, plants), pre-treatment and/or analysis of 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 access unit is defined as one week. During a project/access, we offer access to all sites in the Douglas network. For each access unit, we offer a package including laboratory space for sample preparation and processing, training by highly qualified technicians. This package includes access to maintenance data at each site. The cost of an access unit for private institutions, excluding travel expenses of the applicant, is XXXX euros per week. The cost of an access unit for public institutions, excluding the applicant's travel expenses, is 1 100 euros per week.


The facilities vary according to the location and whether a site belongs to a network (collocation with other networks such as ICOS and RENECOFOR). In most cases soil moisture and soil temperature data are measured. On the other hand, the database contains a multitude of information (soil, vegetation) for each site of the 15N network.