EPS eLibrary: GASEOUS CARBON EMISSION (CO2, CH4) IN FIELD-BASED INCUBATION EXPERIMENT WITH ?BURIED? ORGANIC MATTER, LENA DELTA, SIBERIA

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Title: GASEOUS CARBON EMISSION (CO2, CH4) IN FIELD-BASED INCUBATION EXPERIMENT WITH ?BURIED? ORGANIC MATTER, LENA DELTA, SIBERIA

Year

2017

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25781

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Title

GASEOUS CARBON EMISSION (CO2, CH4) IN FIELD-BASED INCUBATION EXPERIMENT WITH ?BURIED? ORGANIC MATTER, LENA DELTA, SIBERIA

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Authors

S. Evgrafova;O. Novikov;M. Meteleva;G. Guggenberger

DOI

10.5593/sgem2017/32/S13.034

DOI Issue

ISSN

1314-2704

ISBN

978-619-7408-05-8

Language

English

Volume

Issue

Editor

Scientific Area

Soils

Abstract/ Foreword

We aimed at identifying the microbial response and associated release of CO2 and CH4 in/from thawing soil that has been permanently frozen. For that we performed an in situ field-based incubation experiment in a rim of ice-wedge polygon on Samoylov island, Lena Delta, Russia (72°22?N, 126°28?E). Frozen "buried' organic matter were taken from eroded Lena river bank and transferred to the soil surface in a rim of ice-wedge polygon. The principle includes that formerly frozen soil is moved to the active layer, but still residing in the subsoil in order to mimic cryoturbation processes. The mean seasonal methane efflux from soil surface with the transplaced permafrost soil, as measured in the vegetation period after experiment set up, was 0.55±0.07 mg CH4 m-2 h-1; whereas the mean seasonal methane efflux from plots without buried organic material (i.e., disturbance control) was 0.50±0.02 mg CH4 m-2 h-1. Hence, differences were minor. CO2 emission measured by dark chambers did not differ in magnitude during 4 weeks from the beginning of the vegetation period, and then was approximately 1.5 times larger in plots containing organic material. The release of CO2 from soil was mainly responding to soil temperature, as the Pearson's coefficient for correlation between heterotrophic respiration rate and soil and air temperature was r=0.63, r=0.38, respectively. We conclude that the heterotrophic part of microbial community needs some period for adaptation to the chemical properties of the introduced organic matter (approximately 3-4 weeks). Consequently, due to the short vegetation period in this ecosystem we expect that the acceleration of carbon release is possibly not pronounced.

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Type

conference

Url

https://www.sgem.org/index.php/jresearch-article?citekey=Evgrafova201713257264

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Proceedings Тitle

17th International Multidisciplinary Scientific GeoConference SGEM 2017

Note

17th International Multidisciplinary Scientific GeoConference SGEM 2017, 29 June - 5 July, 2017

Type

Proceedings Paper

Publisher

STEF92 Technology

Series

International Multidisciplinary Scientific GeoConference-SGEM

Organization

Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac

Pages

257-264

Date

29 June - 5 July, 2017

Online Source Type

website

Digital Source Type

cdrom

3426

Keywords

permafrost-affected soils; "buried' organic matter; field-based incubation experiment; CO2; CH4

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