News Release

Climate protection: land use changes cause the carbon sink to decline

Researchers recalculate carbon sinks in East Europe using models, satellite data, and statistics

Peer-Reviewed Publication

Karlsruher Institut für Technologie (KIT)

Forests can bind large quantities of carbon in their biomass and, hence, mitigate the effect of greenhouse gases. (Photo: Gabi Zachmann, KIT)

image: Forests can bind large quantities of carbon in their biomass and, hence, mitigate the effect of greenhouse gases. (Photo: Gabi Zachmann, KIT) view more 

Credit: Photo: Gabi Zachmann, KIT

Forests can bind large amounts of carbon on the land surface. In this way, they decisively contribute to reducing net greenhouse gas emissions. For some areas, however, data are still lacking. In East Europe, in particular, the network of installed measurement stations is very loose, such that little has been known about carbon flows and their drivers there. “But East European forests have a great potential as a long-term carbon sink,” says Karina Winkler from the Atmospheric Environmental Research Department of the Institute of Meteorology and Climate Research (IMK-IFU), KIT’s Campus Alpine in Garmisch-Partenkirchen. “Political upheavals in East Europe, however, have caused big changes of land use. Moreover, climate change there increasingly affects the forests. This unique interaction of socioeconomic and climatic factors influences the carbon sinks.”


Study Area Covers 13 Countries

Researchers of IMK-IFU’s Land Use Change & Climate Group, together with researchers from other European research institutions, have now recalculated the carbon sinks in East Europe. The area studied covers 13 countries, from Poland in the West to the Russian Ural Mountains in the East, from the Kola peninsula in the North to Rumania in the South. Calculations are based on different data sources, such as models, satellite-based biomass estimates, forest inventories, and national statistics.   

“From the datasets, we concluded that East Europe stored most of Europe’s carbon from 2010 to 2019,” Winkler says. Comparison of carbon balances revealed that the land surface in East Europe bound about 410 million tons of carbon in biomass every year. This corresponds to about 78 percent of the carbon sink of entire Europe. The biggest carbon sinks can be found in border region of Ukraine, Belarus and Russia, in the southern Ural Mountains, and on the Kola peninsula.


Timber Extraction Has the Biggest Influence on the Carbon Sink in East Europe

However, data also show that carbon absorption in East Europe with time was anything but constant and has even declined. The East European carbon sink is shrinking. To determine the causes, researchers compared the trends of carbon changes with factors of land use, such as land conversion for agriculture, timber extraction, and share of abandoned agricultural areas, as well as with environmental factors, such as temperature, precipitation, soil humidity, and carbon dioxide (CO2) and nitrogen concentrations in the atmosphere.

They found that environmental impacts, such as the change in soil humidity, have a big influence on the carbon balance. Still, spatial patterns of the carbon sink in East Europe can be explained mainly by land use changes. From 2010 to 2019, timber extraction had the biggest influence on the land-based carbon sink in East Europe. Data analysis suggests that an increase in timber extraction in West Russia and reduced forest growth on former agricultural areas caused the carbon sink in East Europe to decline between 2010 and 2019.

The researchers are now working to predict how East European forests and their important carbon sinks will develop under the influence of land use changes and climate change in future. In view of the increasing number of extreme weather events and reduced water availability, however, they fear that the East European carbon sink will continue to decline.


Original Publication (Open Access):
Karina Winkler, Hui Yang, Raphael Ganzenmüller, Richard Fuchs, Guido Ceccherini, Grégory Duveiller, Giacomo Grassi, Julia Pongratz, Ana Bastos, Anatoly Shvidenko, Arnan Araza, Martin Herold, Jean-Pierre Wigneron & Philippe Ciais: Changes in land use and management led to a decline in Eastern Europe’s terrestrial carbon sink. Communications Earth & Environment, 2023. DOI: 10.1038/s43247-023-00893-4


Details on the KIT Climate and Environment Center


Being “The Research University in the Helmholtz Association”, KIT creates and imparts knowledge for the society and the environment. It is the objective to make significant contributions to the global challenges in the fields of energy, mobility, and information. For this, about 9,800 employees cooperate in a broad range of disciplines in natural sciences, engineering sciences, economics, and the humanities and social sciences. KIT prepares its 22,300 students for responsible tasks in society, industry, and science by offering research-based study programs. Innovation efforts at KIT build a bridge between important scientific findings and their application for the benefit of society, economic prosperity, and the preservation of our natural basis of life. KIT is one of the German universities of excellence.

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.