EGU21-9046, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-9046
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Short-term dynamics of C stocks and fluxes in constructed Technosols under green lawns along the bioclimatic gradient

Viacheslav Vasenev1, Marina Slukovskaya2, Marya Korneykova1,3, Natalya Saltan4, Sergey Gorbov1,5, Kristina Ivashchenko1,6, Dmitrii Sarzhanov1, and Andrei Stepanov7
Viacheslav Vasenev et al.
  • 1Department of Landscape Design and Sustainable Ecosystems, Peoples’ Friendship University of Russia, Miklukho-Maklaya str., 6, Moscow, Russia (vasenyov@mail.ru)
  • 2Kola Science Centre, Russian Academy of Sciences, Apatity, Russian Federation
  • 3Institute of North Industrial Ecology Problems – Subdivision of the Federal Research Centre “Kola Science Centre of Russian Academy of Sciences”, Apatity, Murmansk region, Russia
  • 4Polar-Alpine Botanical Garden-Institute of Kola Science Centre of the Russian Academy of Sciences, Apatity, Russia
  • 5Southern Federal University, Rostov-on-Don, Russia
  • 6Institute of Physicochemical and Biological Problems in Soil Science, Russian Academy of Sciences, Pushchino, Moscow region, Russia
  • 7Russia; Russian State Agrarian University – Moscow Timiryazev Agricultural Academy, Moscow, Russia

The contribution of constructed Technosols to the C balance is still poorly understood since high C stocks in topsoil and biomass coincide with intensive CO2 emissions. Moreover, geographical location can have an impact on C stocks and fluxes from Technosols, distinguishing hydrothermal regimes and specific substrates used for Technosols constructions in different regions. This study aims to study C stocks and fluxes in urban lawns on Technosols constructed in three cities in European Russia, following the bioclimatic gradient: Apatity (subarctic climate, north taiga) – Moscow (temperate climate, south taiga and mixed forests) – Rostov-on-Don (semi-arid climate, dry steppes). In each city, Technosols were constructed on summer 2020 to investigate dynamics in C stocks and fluxes at the very early stages after development, when the ecosystems are the most unstable. Both universal (constructed from similar materials and following the same technology) and regional-specific (different in substrates and the sequence of layers) Technosols were observed from September 2020 to April 2021. Soil C stocks were measured in the initial substrates (prior constructing) as well as in constructed Technosols after 2 months after construction. Dynamics in aboveground biomass was measured during the second half of the 2020 growing season (which duration differed between the regions considerably) and the length of the roots was measured at each of the cities once at the end of the 2020 growing season. Dynamics of CO2 was monitored by IRGA once in two weeks during the growing season and once a month during the winter period (in Moscow the chamber approach with GC ending was used instead of IRGA in winter, whereas in Apatity both approaches were measured in parallel). Continuous measurements of the soil temperature were performed by iButtons with a 6-hour frequency.

The average air temperature in Rostov-on-Don was 4ºC higher than in Moscow and more than 10ºC higher than in Apatity, which generally follows the multiannual trends. The similar patterns were observed for the topsoil temperatures however the dynamics was smoother, especially in subsoil during the wintertime. The average CO2 emission were in good coherence with soil temperatures: 0.25, 0.15 and 0.07 gC m-2 hour-1 were obtained in Rostov-on-Don, Moscow and Apatity respectively. Although the full seasonal biomass observation was not complete, preliminary the highest aboveground biomass was obtained in Apatity and the highest root biomass – in Rostov-on-Don. Overall lawn quality estimated based on the projected cover and shoot density was high and confirms that high-quality lawns can be grown almost regardless the bioclimatic conditions.

Acknowledgements The experimental research of C stocks and fluxes was performed with the support of Russian Science Foundation project № 17-77-20046. The climatic monitoring was carried out with the support of Russian Foundation for Basic Research project № 19-29-05187.

 

 

How to cite: Vasenev, V., Slukovskaya, M., Korneykova, M., Saltan, N., Gorbov, S., Ivashchenko, K., Sarzhanov, D., and Stepanov, A.: Short-term dynamics of C stocks and fluxes in constructed Technosols under green lawns along the bioclimatic gradient, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-9046, https://doi.org/10.5194/egusphere-egu21-9046, 2021.

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