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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.1
- 수록면
- 121 - 130 (10page)
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초록· 키워드
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Geomorphic disturbances to surrounding terrain induced by thermal degradation of permafrost often lead to surface ponding or soil saturation. However, interactions between soil moisture and temperature on belowground carbon processes are not fully understood. We conducted batch incubation for three temperature treatments [constant freezing (CF), constant thawing (CT), and fluctuating temperatures (FTC)] and two soil moisture conditions (ponded and unsaturated). Extracellular enzyme activity was higher under ponded conditions than under unsaturated conditions, resulting in higher dissolved organic carbon (DOC) levels for ponded conditions. More CO2 and less CH4 were emitted under unsaturated conditions than under ponded conditions. Carbon dioxide emission was similar for CT and FTC treatments regardless of moisture conditions. However, CH4 emission was higher under ponded conditions than under unsaturated conditions for CT treatments, but was very low for FTC treatments regardless of moisture conditions. Little CO2 and CH4 were produced in CF treatments. Despite similar CO2 and CH4 emission levels for CT and FTC treatments, lower DOC levels were observed in the latter, indicating slower soil organic carbon (SOC) decomposition. Similar DOC variation patterns between CT and CF treatments indicated that SOC decomposition was considerable and further degradation to CO2 or CH4 was negligible even for CF treatments. The SOC decomposition and CO2 and CH4 emissions were considerable for FTC treatments. Our results suggest that labile-C produced during SOC decomposition in seasonally frozen soils and permafrost may provide supplemental substrates that would enhance the positive feedback to climate change with rising temperatures and wetter conditions.
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등록된 정보가 없습니다.
참고문헌 (48)
참고문헌 신청
Agren, A. / 2008 / Terrestrial export of highly bioavailable carbon from small boreal catchments in spring floods / Freshwater Biology 53:964~972
Anisimov, O.A. / 2007 / Polar regions (arctic and antarctic) / Climate Change 15:653~685
Bishop, K. / 2011 / Water storage in a till catchment. II: Implications of transmissivity feedback for flow paths and turnover times / Hydrological Processes 25:3950~3959
Blagodatskaya, E. / 2016 / Temperature sensitivity and enzymatic mechanisms of soil organic matter decomposition along an altitudinal gradient of Mount Kilimanjaro / Scientific Reports 6:22240
Blake, L.I. / 2015 / Response of methanogens in Arctic sediments to temperature and methanogenic substrate availability / PLoS One 10:e0129733
Anisimov, O.A. / 2007 / Polar regions (arctic and antarctic) / Climate Change 15:653~685
Bishop, K. / 2011 / Water storage in a till catchment. II: Implications of transmissivity feedback for flow paths and turnover times / Hydrological Processes 25:3950~3959
Blagodatskaya, E. / 2016 / Temperature sensitivity and enzymatic mechanisms of soil organic matter decomposition along an altitudinal gradient of Mount Kilimanjaro / Scientific Reports 6:22240
Blake, L.I. / 2015 / Response of methanogens in Arctic sediments to temperature and methanogenic substrate availability / PLoS One 10:e0129733
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