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Resumen

Soil carbon is threatened in many regions by intensive land use. At the same time, it can be important part of restoring sustainable ecosystems and contributing to viable climate conditions. Soil organic carbon (SOC) is highly variable in the landscape. Its stock depends on among other, climate conditions, soil type, topographic features, and management. SOC stock at any time is the result of difference in input of C to the soil and what is released again. Different approaches can therefore be applied to changes in the SOC stock: · Direct measurements of SOC stock at defined time intervals or by chrono sequential series · Evaluation of in and out fluxes and carbon budget of ecosystems In presentation I will provide three examples of approaches to estimate SOC and it changes over time. Jón Gudmundsson is a senior researcher at the Agricultural University of Iceland. Considerable part of his research activity has revolved around measurements of greenhouse gas (GHG) fluxes of various ecosystems in Iceland and under different managements. Second centre of gravity in his research has been related to the inventory of GHG emissions of the LULUCF section in Iceland, where he was a leading expert for many years. To support the preparation of the inventory, a national geographic land use database (IGLUD) was established, with the aim to compile the available data on land use, preparing maps of land use and estimate emissions. Facing very limited data on soil organic carbon (SOC) in various land use categories, a large sampling scheme on SOC and land cover data was launched and first round completed in 2007-2017. As total emissions are product of emissions per area unit and the total area, refinement of area estimates of key land use categories have been important part of his research activities.

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