Vegetation and Precipitation Patterns Define Annual Dynamics of CO 2 Efflux from Soil and Its Components

Dmitriy Khoroshaev (), Irina Kurganova, Valentin Lopes de Gerenyu, Dmitry Sapronov, Sergey Kivalov, Abeer S. Aloufi and Yakov Kuzyakov
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Dmitriy Khoroshaev: Institute of Physicochemical and Biological Problems in Soil Science of the Russian Academy of Sciences, 142290 Pushchino, Russia
Irina Kurganova: Institute of Physicochemical and Biological Problems in Soil Science of the Russian Academy of Sciences, 142290 Pushchino, Russia
Valentin Lopes de Gerenyu: Institute of Physicochemical and Biological Problems in Soil Science of the Russian Academy of Sciences, 142290 Pushchino, Russia
Dmitry Sapronov: Institute of Physicochemical and Biological Problems in Soil Science of the Russian Academy of Sciences, 142290 Pushchino, Russia
Sergey Kivalov: Institute of Physicochemical and Biological Problems in Soil Science of the Russian Academy of Sciences, 142290 Pushchino, Russia
Abeer S. Aloufi: Department of Biology, College of Science, Princess Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
Yakov Kuzyakov: Agro-Technological Institute, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia

Land, 2024, vol. 13, issue 12, 1-18

Abstract: Respiration of soil heterotrophs—mainly of bacteria and fungi—is a substantial part of carbon balance in terrestrial ecosystems, which tie up organic matter decomposition with the rise of atmospheric CO 2 concentration. Deep understanding and prediction of seasonal and interannual variation of heterotrophic and autotrophic components of CO 2 efflux from soil is limited by the lack of long-term, full-year measurements. To better understand the impact of current climate changes on CO 2 emissions from soils in the mixed forest and mowed grassland, we measured CO 2 efflux every week for 2 years. Heterotrophic (SOM-derived + leaf litter) and root-associated (root with rhizosphere microorganisms) components were partitioned by the root exclusion method. The total CO 2 efflux from soil was averaged 500 g C m −2 yr −1 in the forest and 650 g C m −2 yr −1 in the grassland, with shares of the no-growing cold season (Nov–Mar) of 22% and 14%, respectively. The heterotrophic component of CO 2 efflux from the soil averaged 62% in the forest and 28% in the grassland, and it was generally stable across seasons. The redistribution of the annual precipitation amounts as well as their deficit (droughts) reduced soil respiration by 33–81% and heterotrophic respiration by 24–57% during dry periods. This effect was more pronounced in the grassland (with an average decline of 56% compared to 39% in the forest), which is related to lower soil moisture content in the grassland topsoil during dry periods.

Keywords: microbial respiration; root derived respiration; grassland and forest ecosystems; seasonal dynamics; interannual variability (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2024
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