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Forest soil liming as a measure to increase the adaptability of forests to climate change and to secure and increase CO₂ storage and sink function of forests (KalKo)

Bundesministerium für Ernährung und Landwirtschaft (BMEL)
Bundesministerium für Umwelt, Naturschutz, Bau und Reaktorsicherheit (BMUB)
Project number:
Project director:
Martin Kaupenjohann
Antonia Zieger, Doreen Zirkler
Nordwestdeutsche Forstliche Versuchsanstalt (NW-FVA) und
Forstliche Versuchs- und Forschungsanstalt Baden-Württemberg (FVA BW)


Since the 1980s, forest soil liming (Bodenschutzkalkung) is carried out on anthropogenically acidified sites. The aim of the KalKo joint project is to investigate and quantify the effects of forest soil liming on C sequestration in forest ecosystems on the one hand and on the resilience of forest ecosystems to changing climatic conditions on the other hand. It will be examined whether organic carbon is enriched in the subsoil in the long term after liming and thus quantitatively exceeds the short-term liming-related C losses by gaseous releases from the topsoil. Increased C sequestration after liming would have both a climate-protective effect and a vitality-enhancing effect on the forests through improved water and nutrient supply. Furthermore, we investigate whether soil liming - in addition to soil acidity compensation - promotes aggregate formation and stability as the basis for increased deep rooting. Better deep rooting is expected to contribute considerably to the adaptation of forests to climate change. In addition to soil protection, flood protection is also of particular social relevance here. A liming-related stabilization of soil aggregates, the associated improvement of hydraulic properties, such as infiltration and water storage capacity, and deeper rooting are important contributors.


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