Details
| Originalsprache | Englisch |
|---|---|
| Titel des Sammelwerks | 17th International Multidiciplinary Scientific Geoconference SGEM 2017 |
| Seiten | 257-264 |
| Seitenumfang | 8 |
| Publikationsstatus | Veröffentlicht - 2017 |
| Veranstaltung | International Multidisciplinary Scientific GeoConference - Albena, Bulgarien Dauer: 29 Juni 2017 → 5 Juli 2017 Konferenznummer: 17 |
Publikationsreihe
| Name | International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM |
|---|---|
| Nummer | 32 |
| Band | 17 |
| ISSN (Print) | 1314-2704 |
Abstract
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.
ASJC Scopus Sachgebiete
- Erdkunde und Planetologie (insg.)
- Geotechnik und Ingenieurgeologie
- Erdkunde und Planetologie (insg.)
- Geologie
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
17th International Multidiciplinary Scientific Geoconference SGEM 2017. 2017. S. 257-264 (International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM; Band 17, Nr. 32).
Publikation: Beitrag in Buch/Bericht/Sammelwerk/Konferenzband › Aufsatz in Konferenzband › Forschung › Peer-Review
}
TY - GEN
T1 - Gaseous carbon emission (Co2, ch4) in field-based incubation experiment with “buried” organic matter, Lena Delta, Siberia
AU - Evgrafova, Svetlana
AU - Novikov, Oleg
AU - Meteleva, Maria
AU - Guggenberger, Georg
N1 - Conference code: 17
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
KW - "Buried' organic matter
KW - CH
KW - CO
KW - Field-based incubation experiment
KW - Permafrost-affected soils
UR - http://www.scopus.com/inward/record.url?scp=85032388911&partnerID=8YFLogxK
U2 - 10.5593/sgem2017/32/S13.034
DO - 10.5593/sgem2017/32/S13.034
M3 - Conference contribution
AN - SCOPUS:85032388911
SN - 9786197408263
T3 - International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM
SP - 257
EP - 264
BT - 17th International Multidiciplinary Scientific Geoconference SGEM 2017
T2 - 17th International Multidisciplinary Scientific Geoconference, SGEM 2017
Y2 - 29 June 2017 through 5 July 2017
ER -