Carbon Dioxide Emission from Soils of Russian Terrestrial Ecosystems

Kurganova, I. (2002). Carbon Dioxide Emission from Soils of Russian Terrestrial Ecosystems. IIASA Interim Report. IIASA, Laxenburg, Austria: IR-02-070

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Abstract

In order to estimate the total, heterotrophic and autotrophic respiration of Russian soils, a special soil respiration database (SRDB) was compiled based on published results and the author's own measurements. The SRDB includes 95 regional studies and contains 375 records.

It has been found that the contribution of the summer CO2 flux to the annual carbon dioxide flux (ACDF) is adequately quantified by linear and polynomial regressions. The total soil respirations of individual ecosystems were computed based on these models and the measured summer CO2 fluxes.

The mean and median values of root respiration by five aggregated land classes were estimated, based on experimental data. By using the obtained results we calculated the heterotrophic and autotrophic components of the total CO2 by land classes.

The total, heterotrophic and autotrophic ACDF from Russian soils were assessed based on the distribution of areas of different land classes within the total area of soil units. The total, heterotrophic and autotrophic ACDF from Russian soils were estimated to be 5.67, 2.78 and 2.89 PgCy-1, respectively. The maps of total, heterotrophic and autotrophic soil respiration were developed using a geographic information system (GIS) approach. The summarized heterotrophic CO2 flux and mean weighted heterotrophic respiration of soils by different land use categories and location in different bio-climatic zones were computed using a GIS approach, based on a heterotrophic soil respiration map, a land use/land cover map and a vegetation map.

The results obtained contribute to current understanding of the full terrestrial biota carbon balance of Russia.

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