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Eurasian Soil Science

, Volume 50, Issue 4, pp 396–411 | Cite as

Evaluation of organic carbon stocks and СО2 fluxes in grasslands of Western Transbaikalia

  • I. N. Lavrentyeva
  • M. G. Merkusheva
  • L. L. Ubugunov
Soil Chemistry
  • 29 Downloads

Abstract

The stocks of organic carbon and mean rates of the CO2 emission during the growing season (May–September) and the entire year were estimated in a sequence of grass ecosystems along the transect encompassing chestnut and meadow-chestnut steppe soils, marsh and meadow alluvial soils, and a haloxerophytic community on a typical solonchak. The total stocks of organic carbon comprised 6.17–9.70 kg С/m2 in steppe, 7.41–10.04 kg С/m2 in floodplain, and 4.74 kg С/m2 in haloxerophytic ecosystems. The portion of humus carbon in the upper 50-cm-thick soil layer comprised 79–92% of the total carbon stock. The mean daily CO2 emission (С–CO2/(m2 day)) from alluvial soils was moderate (3.3–4.9) or low (1.5–2.5). The dependence of the CO2 emission on the moistening of steppe soils, temperature of alluvial soils, and temperature and moistening of solonchak was revealed. In comparison with the CO2 emission from the zonal chestnut soil, its mean values during the growing season and the entire year were 1.2 times higher for the meadowchestnut soil, 3.3 times higher for the marsh alluvial soil, 2.3 times higher for the meadow alluvial soil, and 1.7 times higher for the solonchak. The portion of the CO2 emission beyond the growing season in the mean annual emission averaged 19.8–24.2% and depended on the type of grass ecosystem and on weather conditions of particular years. The sink of carbon in the grass ecosystems exceeded carbon emission, especially in the steppe ecosystems.

Keywords

grass ecosystem chestnut soil Kastanozems meadow-chestnut soil Gleyic Kastanozem (Chromic) marsh alluvial soil Gleyic Histic Fluvisol alluvial meadow soil Calcaric Fluvisols (Oxyaquic) typical solonchak Sodic Solonchak (Loamic Sulfatic) organic carbon stocks CO2 emission CO2 budget 

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • I. N. Lavrentyeva
    • 1
    • 2
  • M. G. Merkusheva
    • 1
  • L. L. Ubugunov
    • 1
    • 2
  1. 1.Institute of General and Experimental Biology, Siberian BranchRussian Academy of SciencesUlan-UdeRussia
  2. 2.Buryat State Agricultural AcademyUlan-UdeRussia

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