Welcome to ICP Forests

A programme aiming at a comprehensive compilation of information on the condition of forests in Europe and beyond

The International Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests (ICP Forests) was launched in 1985 under the Convention on Long-range Transboundary Air Pollution (Air Convention, formerly CLRTAP) of the United Nations Economic Commission for Europe (UNECE).

ICP Forests monitors forest condition in Europe at two monitoring intensity levels:

The Level I monitoring is based on around 6000 observation plots on a systematic transnational grid of 16 x 16 km throughout Europe and beyond to gain insight into the geographic and temporal variations in forest condition.

The Level II intensive monitoring comprises around 500 plots in selected forest ecosystems with the aim to clarify cause-effect relationships.

At present 42 countries in Europe and beyond participate in ICP Forests.

Blog Posts

Deposition & Forest Growth - WSL highlights the results of Swiss led ICP Forests study

Under the title of Too much nitrogen slows forest growth in Europe, the Swiss Federal Institute for Forest, Snow and Landscape Research WSL published an appealing press release of the study "Nitrogen deposition is the most important environmental driver of growth of pure, even-aged and managed European forests“ by Etzold et al. (2020) at their website.

The study published just recently in Forest Ecology and Management was initiated and led by ICP Forests colleagues of the WSL. Using data from 1995 to 2010 and 442 ICP Forests plots, they revealed an average tipping point of 30 kg N ha-1 yr-1 of atmospheric deposition at which…


Posted by Anne-Katrin Prescher on January 28, 2020 at 15:00

Season's Greetings and best wishes for 2020!

Dear members of the ICP Forests website community,

The Chairman of ICP Forests and the team at the Programme Co-ordinating Centre wish you happy holidays & a peaceful and happy new year 2020!

Marco Ferretti, Chairman of ICP Forests
Kai Schwärzel, Till Kirchner, Alexa Michel, Anne-Katrin Prescher, Ralph Ryl, Programme Co-ordinating Centre of ICP Forests

Posted by Anne-Katrin Prescher on December 18, 2019 at 11:43

Award for ICP Forests Brief

Alexa Michel from PCC and co-authors were awarded the Thünen Research Prize for Excellence in Target Group-Oriented Work by the Society of the Friends of the Thünen Institute for their concept and realisation of the ICP Forests Brief.

On Monday, 9th Dec 2019, the winners of the Thünen Research Awards 2019 were awarded as part of the first "Thünen Day". One out of five prizes was given to Alexa Michel, Inken Krüger, Anne-Katrin Prescher, Tanja Sanders, Andreas Schmitz and Walter Seidling for ICP Forests Brief: Publishing a new international publication series on European forest monitoring for better communication between science, politics and society. In representation…


Posted by Anne-Katrin Prescher on December 11, 2019 at 14:00

ICP Forests and EANET delegates met in a joint workshop in Japan

On 21st November and 22nd November 2019, ICP Forests colleagues met delegates from the Acid Deposition Monitoring Network in East Asia (EANET) in a joint "Workshop on regional impact assessment of atmospheric deposition and air pollution on forest ecosystems" in Niigata, Japan. The workshop was initiated by Hiroyuki Sase in cooperation with ICP Forests chair Marco Ferretti to share and compare the European knowledge and experience with colleagues from EANET, and to promote further co-operation in the future. From the ICP Forests community, chair Marco Ferretti, head of…


Posted by Anne-Katrin Prescher on November 27, 2019 at 11:30


Soil spectroscopy

Dear colleagues,as topicality is rising on application of soil spectroscopy for routine analysis by utilizing own created or shared spectral libraries, I am interested if someone could share their knowledge on instrumentation choice? Could someone…Continue

Started by Aldis Butlers Dec 19, 2019.

Choosing brands for some instruments 1 Reply

Dear colleagues,It is planned to purchase a new mill, Kjeldahl Steam Distillation System for N analysis and combined system to analyze pH, EC and alkalinity for water samples for my lab. 1. There are two mills in our lab. One of them is Retsch ZM200…Continue

Started by Rabia GUNHAN. Last reply by Robert Menegotto Apr 30, 2018.


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