Estimation of the influence of hydrothermal conditions on the carbon isotope composition in Sphagnum mosses of bogs of Western Siberia

International Conference and Early Career Scientists School on Environmental Observations, Modeling and Information Systems: ENVIROMIS-2018

生态环境科学;计算机科学

Preis, Yu I^1 ; Simonova, G.V.^1 ; Voropay, N.N.^1,2 ; Dyukarev, E.A.^1

Institute of Monitoring of Climatic and Ecological Systems SB RAS, Tomsk, Russia^1

V.B. Sochava Institute of Geography SB RAS, Irkutsk, Russia^2

关键词: Carbon isotope composition;    Climate change impact;    Hydrothermal conditions;    Multiple regression analysis;    Multiple regression model;    Paleoclimatic reconstruction;    Positive correlations;    Precipitation regimes;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/211/1/012031/pdf
DOI  :  10.1088/1755-1315/211/1/012031

来源: IOP

【 摘 要 】

For the first time in Western Siberia, a large-scale study of δ13C in oligotrophic Sphagnum mosses is carried out. It is found that mosses of the Sphagnum balticum group and the Shagnum fuscum group have different type of isotopic composition along the meridional gradient. The response of mosses of typical and nontypical habitats to changes in hydrothermal conditions is estimated using correlation and multiple regression analysis. The values of δ13C of the Sphagnum balticum mosses group have strong negative correlations with summer temperature characteristics of nontypical habitats and positive correlations with the precipitation regime and hydrothermal coefficient of all habitats. Significant positive correlations of the isotopic composition of Sphagnum fuscum group mosses are found only for a complex hydrothermal coefficient of typical habitats. A multiple regression model taking into account the sum of temperatures above 10°C, the Selyaninov hydrothermal coefficient, and winter precipitation explains from 26 to 58% of the observed variability of δ13C variations for all mosses and all habitats, with the exception of mosses of the Sphagnum fuscum group in all and typical habitats. This confirms the possibility of using Sphagnum mosses for monitoring climate change impacts, the functional state of bogs, as well as for paleoecological and paleoclimatic reconstructions.