Eurasian Soil Science

, Volume 50, Issue 4, pp 476–482 | Cite as

Microbiological transformation of carbon and nitrogen compounds in forest soils of Central Evenkia

  • N. D. Sorokin
  • D. E. Aleksandrov
  • I. D. Grodnitskaya
  • S. Yu. Evgrafova
Soil Biology

Abstract

It has been found that the total productivity of bacteria and micromycetes in the 0- to 50-cm layer of homogeneous cryozems (Cryosols) on slopes of northern and southern exposures varies from 1.2 to 1.4 t/ha, respectively, and the calculated content of microbial carbon varies in the range 0.7–0.9 t/ha. The respiratory activity of the upper soil layer is 2.5–2.6 μg C–CO2/(g h); the potential methane formation capacity reaches 0.13 nmol CH4/(m2 day) for soils on slopes of northern exposure and 0.16 nmol CH4/(m2 day) for slopes of southern exposure. Accumulation of sorbed ammonium is recorded in the range 15–17 mg NH4/100 g soil in summer. The increase of temperature in the upper horizons of soils on slopes of southern exposure by 5°C compared to the northern slopes results in only an insignificant increase in the emission of CO2 and CH4. The accumulation of sorbed ammonium and nitrate nitrogen in homogeneous cryozems during the vegetation period is comparable to that in gray forest soils of the southern taiga subzone of the Middle Siberia.

Keywords

cryogenic soils slopes of northern and southern exposures microbial complexes CO2 and CH4 emission respiratory activity ammonium and nitrate nitrogen 

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • N. D. Sorokin
    • 1
  • D. E. Aleksandrov
    • 1
  • I. D. Grodnitskaya
    • 1
  • S. Yu. Evgrafova
    • 1
  1. 1.Sukachev Institute of Forest, Siberian BranchRussian Academy of SciencesKrasnoyarskRussia

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