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Variations in Carbon and Nitrogen Isotopes in Soils along the Barguzinsky Ridge, Eastern Baikal Region, Russia

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Moscow University Soil Science Bulletin Aims and scope

Abstract

The soils along the western exposed slopes of the Barguzinsky Ridge are characterized by a clear altitudinal zoning. The lower part of the catena transect is dominated by soddy–podzolized brown soils and brown forest soils, whereas higher altitudes are characterized by Leptosols, Umbrisols, and Cryosols. Typical features of these soils are shallowness, thick litter layers, and low pH values. Corg and N decrease with increasing soil depth, and C/N ratios are also relatively high. Bulk δ13С values vary from –28.45 to –22.10‰ generally increasing with soil depth and indicating the C3-vegetation. At higher altitudes, δ13С values of the uppermost mineral horizons increase from –26.82 (500 m a.s.l.) to –22.66‰ (1700 m a.s.l.) most likely due to the reduction in the average annual air temperature. In contrast to δ13С, δ15N values of the uppermost mineral layer decrease from 10.04‰ at 500 m a.s.l. to 8.77‰ at 1700 m a.s.l. indicating the N cycles to be more closed at lower average annual air temperatures. The relationship between average annual temperature and δ13С values makes it possible to conclude that with a decrease by 1°С, δ13С will decrease by 0.89‰ in the litter and by 0.67‰ in the mineral horizon.

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ACKNOWLEDGMENTS

We are grateful to the Program of the German Academic Exchange Service for the support of D.B. Andreeva.

Funding

This work was carried out under a state order to the Institute of General and Experimental Biology, Siberian Branch, Russian Academy of Sciences, project no. 121030100228-4.

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Correspondence to D. B. Andreeva.

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Translated by E. Maslennikova

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Andreeva, D.B., Balsanova, L.D., Lavrent’eva, I.N. et al. Variations in Carbon and Nitrogen Isotopes in Soils along the Barguzinsky Ridge, Eastern Baikal Region, Russia. Moscow Univ. Soil Sci. Bull. 77, 277–283 (2022). https://doi.org/10.3103/S0147687422040020

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  • DOI: https://doi.org/10.3103/S0147687422040020

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