Category: Non classé

Wild boars, predators of forest bird species?

Wild boars are considered as key elements of forest ecosystems by having direct or indirect effects on the environment through tillage, zoochory, or trampling, for example. These impacts can be observed in bird communities. This problem is well known in agricultural environments but what about forest bird species? This question is the subject of a …

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What sort of bramble is it?

According to the latest estimates, there are between 500 and 700 species of bramble in France ( In France the inventory of bramble species is still very incomplete. The first floristic inventories carried out on OPTMix revealed the presence of several species of brambles without being able to determine them reliably. An experiment has just …

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Vincent Seigner’s Departure

Vincent Seigner has just left us this summer for other horizons (Quebec). A big thank you to Vincent for all he has contributed to the OPTMix project since the installation of the plots until the installation of all the sensors and dataloggers. Below is a small illustration made by his daughter showing Vincent in action …

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Visit of the Irstea Measurement Network, May 17 and 18

Last May 17 and 18, the Forest Ecosystems research unit of Nogent-sur-Vernisson (Irstea, EFNO) welcomed the 9th Irstea Measurement Network meeting. On this occasion, a group of forty people from all IRSTEA centers went to visit OPTMix. After an introduction about the Orleans’s forest and OPTMix network the visit focus on four main points: – …

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Functionning of perched water table and impact on tree growth

The functioning of perched water tables and their impacts on tree growth are still poorly documented while soils with temporary waterlogging are very frequent in France. How does perched water table change during winter? Are these changes influenced by the forest stand features? Is this perched water table a disadvantage or an advantage for the growth …

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Application forms for new experiments are available

The application forms to perform a new experiment in the OPTMix plots are available here (french version only). You will find a form for external demands (for researchers belonging to another research unit than the Irstea-EFNO research unit at Nogent-sur-Vernisson) and a form for internal demands. To help you in this process please contact Nathalie Korboulewsky.

Measuring soil moisture with a neutron probe

This week began the installation of aluminum tubes at a depth of 125cm for measuring soil moisture content with a neutron probe. These tubes are installed near the pits already equipped with probes recording water content (CS616 – Campbell Scientific). The measurements of the neutron probe, considered as reference measurements, will be used to validate …

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Article published: predicting solar radiation transmittance in mixed forests

An article on predicting solar radiation transmittance in pure and mixed stands has just been published in Forest Ecology and Management. This work was carried out on the experimental plots of the OPTMix device. Below are the key points of the article. Perot, T., A. Mårell, N. Korboulewsky, V. Seigner and P. Balandier (2017). « Modeling …

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OPTMix annual meeting, 10, 12 and 13 january 2017

The annual meeting of the project took place on 10, 12 and 13 January, 2017 at Irstea Nogent-sur-Vernisson. The participants presented recent results and ongoing works concerning the different topics of the project. They also presented the program of future works.  

News from the ScanComp project

Data form T-Lidar of the ScanComp project (see corresponding article) were analyzed by a Master1 student (Enrick Potiron, UMR Lerfob, supervisors Ignacio Barbeito and Mathieu Dassot). Dendrometric variables (diameter, height, crown surface, crown volume …) were extracted using the Computree platform of the French National Forest Office ( Below are some pictures obtained from the …

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