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Changes in soil organic carbon content across England and Wales between 1978 and 2003
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The map shows the difference in soil organic carbon content
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Projected changes in soil organic carbon for cropland 1990-2080
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Predicted changes in soil organic carbon for croplands 1990–2080. The image on the left shows changes due to climate change only while the map on the right shows changes as a result of variations in net primary production and the advent of new technologies related to crop management (e.g. machinery, pesticides, herbicides, agronomic knowledge of farmers) and breeding (development of higher yielding varieties through improved stress resistance and/or yield potential) that result in yield increases.
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Soil organic carbon (CLIM 027) - Assessment published Nov 2012
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Soil carbon stocks in the EU-27 are around 75 billion tonnes of carbon; around 50 % of which is located in Ireland, Finland, Sweden and the United Kingdom (because of the large area of peatlands in these countries).
The largest emissions of CO 2 from soils are due to conversion (drainage) of organic soils, and amount to 20–40 tonnes of CO 2 per hectare per year. The most effective option to manage soil carbon in order to mitigate climate change is to preserve existing stocks in soils, and especially the large stocks in peat and other soils with a high content of organic carbon.
On average, soils in Europe are most likely to be accumulating carbon. Soils under grassland and forests are a carbon sink (estimated up to 80 million tonnes of carbon per year) whereas soils under arable land are a smaller carbon source (estimated from 10–40 million tonnes of carbon per year).
The effects of climate change on soil organic carbon and soil respiration are complex, and depend on distinct climatic and biotic drivers. However, they lack rigorous supporting datasets.
Climate change is expected to have an impact on soil carbon in the long term, but changes in the short term will more likely be driven by land management practices and land use change
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Soil organic carbon
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Soil organic carbon (CLIM 027) - Assessment published Sep 2008
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Soil in the EU contains around 71 gigatonnes of organic carbon, nearly 10 % of the carbon accumulated in the atmosphere. An increase in temperature and a reduction in moisture tend to accelerate the decomposition of organic material, leading to a decline in soil organic carbon stocks in Europe and an increase in CO 2 emissions to the atmosphere. This could wipe out all the savings that other sectors of the economy are achieving to reduce anthropogenic greenhouse gas emissions. Losses of soil organic carbon have already been observed in measurements in various European regions over the past 25 years. The projected changes in the climate during the 21st century will change the contribution of soil to the CO 2 cycle in most areas of the EU. Adapted land-use and management practices could be implemented to counterbalance the climate-induced decline of carbon levels in soil.
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Soil organic carbon