EGU21-14784
https://doi.org/10.5194/egusphere-egu21-14784
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Soil microbial biomass and functional diversity in urban forest parks and suburban forests of various biomes in European Russia

Nadezhda Ananyeva1, Ruslan Khatit1, Sofia Sushko1,2,3, Anna Buyvolova4, Andrey Dolgikh5, Anna Zhuravleva1, Alexandra Selezneva1, Viacheslav Vasenev2, and Kristina Ivashchenko1,2
Nadezhda Ananyeva et al.
  • 1Institute of Physicochemical and Biological Problems in Soil Science, RAS, Pushchino, Moscow region, Russia (ananyeva@rambler.ru)
  • 2Department of Landscape Design and Sustainable Ecosystems, Agrarian-Technological Institute, Peoples’ Friendship University of Russia, Moscow, Russia
  • 3Agrophysical Research Institute, Saint- Petersburg, Russia
  • 4Lomonosov Moscow State University, Moscow, Russia
  • 5Institute of Geography, Moscow, Russia

Forest parks play an important role in the sustainable functioning of urban ecosystems. In contrast to natural forests, urban forests are under continuous anthropogenic pressure, affecting the soil microbial community functioning and its capacity to provide many ecosystem services. Moreover, another significant factor determining such functioning is bioclimatic conditions, i.e., city geographic location. Our study aims to examine the effect of urbanization on soil microbial biomass and functional diversity along a latitudinal gradient of European Russia. Urban forest parks (UFP) were chosen in Moscow, Tula, and Belgorod cities located in mixed coniferous-broadleaved forests, deciduous forests, and forest-steppe biomes of European Russia, respectively (17 sites). Outside of the cities the reference suburban forests (SUF) were selected (12 sites). When selecting sites, we considered the following criteria: i) same soil reference group within the biome (Retisols, Luvisols, Phaeozems in mixed coniferous-broadleaved forests, deciduous forests, and forest-steppe, respectively), ii) loam parent materials, and iii) forest aged ≥60 years. In each UFP and SUF, five spatially distributed plots were chosen, in which soil samples were taken from the upper 10 cm layer without litter (totally 85 and 60 for UFP and SUF). For freshly collected soil samples, microbial biomass carbon content (MBC, substrate-induced respiration method) and basal respiration (BR; rate of CO2 release) were measured, then the ratio BR / MBC = qCO2 was calculated. The community level physiological profile of soil microorganisms (CLPP, MicroRespTM technique) indicating the microbial ability to utilize different organic substrates (carbohydrates, acids: amino, carboxylic, phenolic, 14 totally) was tested. CLPP data were used to calculate the Shannon–Wiener diversity index (HCLPP).

It was found that soil BR decreased on average from SUF to USP in all studied biomes, while the MBC content did not change significantly. A significant increase of MBC in USP and SUF soils was observed from north to south (from mixed coniferous-broadleaved forests to forest-steppe), and for qCO2 – decreasing. The CLPP of the studied soils were dominated by microorganisms consuming carboxylic acids (ascorbic and citric) and carbohydrates (glucose, fructose, galactose). Cluster analysis identified two groups that differed by soil CLPP: i) mixed coniferous-broadleaved forests and deciduous forests (Moscow, Tula) and ii) forest-steppe (Belgorod). Soil HCLPP index didn’t significantly differ between SUF and UFP in all studied biomes. Two-way ANOVA showed that soil MBC, qCO2, and HCLPP changes were more associated with bioclimatic conditions (18-47% of explained variance, P <0.05) than urbanization (P> 0.05). On contrary, soil BR was more sensitive to urbanization (4% of explained variance, P <0.05) than to the change of bioclimatic conditions (P> 0.05). Notably, driving factors of spatial variation for the studied soil microbial properties within each city (53-92% unexplained variance) have yet to be identified.

 

This study was supported by the Russian Foundation for Basic Research, project No. 20-04-00148.

How to cite: Ananyeva, N., Khatit, R., Sushko, S., Buyvolova, A., Dolgikh, A., Zhuravleva, A., Selezneva, A., Vasenev, V., and Ivashchenko, K.: Soil microbial biomass and functional diversity in urban forest parks and suburban forests of various biomes in European Russia, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14784, https://doi.org/10.5194/egusphere-egu21-14784, 2021.