IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Carbon accumulation in a permafrost polygon peatland: steady long-term rates in spite of shifts between dry and wet conditions
Gao, Yang1,2; Couwenberg, John2
Corresponding AuthorCouwenberg, John
2015
Source PublicationGLOBAL CHANGE BIOLOGY
ISSN1354-1013
EISSN1365-2486
Volume21Issue:2Pages:803-815
SubtypeArticle
AbstractIce-wedge polygon peatlands contain a substantial part of the carbon stored in permafrost soils. However, little is known about their long-term carbon accumulation rates (CAR) in relation to shifts in vegetation and climate. We collected four peat profiles from one single polygon in NE Yakutia and cut them into contiguous 0.5cm slices. Pollen density interpolation between AMS C-14 dated levels provided the time span contained in each of the sample slices, which - in combination with the volumetric carbon content - allowed for the reconstruction of CAR over decadal and centennial timescales. Vegetation representing dry palaeo-ridges and wet depressions was reconstructed with detailed micro- and macrofossil analysis. We found repeated shifts between wet and dry conditions during the past millennium. Dry ridges with associated permafrost growth originated during phases of (relatively) warm summer temperature and collapsed during relatively cold phases, illustrating the important role of vegetation and peat as intermediaries between ambient air temperature and the permafrost. The average long-term CAR across the four profiles was 10.6 +/- 5.5g Cm(-2)yr(-1). Time-weighted mean CAR did not differ significantly between wet depression and dry ridge/hummock phases (10.6 +/- 5.2g Cm(-2)yr(-1) and 10.3 +/- 5.7g Cm(-2)yr(-1), respectively). Although we observed increased CAR in relation to warm shifts, we also found changes in the opposite direction and the highest CAR actually occurred during the Little Ice Age. In fact, CAR rather seems to be governed by strong internal feedback mechanisms and has roughly remained stable on centennial time scales. The absence of significant differences in CAR between dry ridge and wet depression phases suggests that recent warming and associated expansion of shrubs will not affect long-term rates of carbon burial in ice-wedge polygon peatlands.
KeywordCarbon Accumulation Dwarf Shrubs Ice-wedge Polygon Ne Siberia Palaeo-temperature Tundra Vegetation Development
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
DOI10.1111/gcb.12742
WOS Subject ExtendedBiodiversity & Conservation ; Environmental Sciences & Ecology
Indexed BySCI
WOS KeywordACTIVE LAYER ; SIBERIAN TUNDRA ; SHRUB EXPANSION ; CLIMATE ; THAW ; ECOSYSTEMS ; VEGETATION ; CALIBRATION ; INCREASES ; RESPONSES
Language英语
Quartile1区
TOP
WOS SubjectBiodiversity Conservation ; Ecology ; Environmental Sciences
WOS IDWOS:000348652400025
Funding OrganizationDeutsche Forschungsgemeinschaft (DFG)(Jo 332/14-1)
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/9589
Collection山地表生过程与生态调控重点实验室
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu, Sichuan, Peoples R China
2.Ernst Moritz Arndt Univ Greifswald, Inst Bot & Landscape Ecol, Greifswald, Germany
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Gao, Yang,Couwenberg, John. Carbon accumulation in a permafrost polygon peatland: steady long-term rates in spite of shifts between dry and wet conditions[J]. GLOBAL CHANGE BIOLOGY,2015,21(2):803-815.
APA Gao, Yang,&Couwenberg, John.(2015).Carbon accumulation in a permafrost polygon peatland: steady long-term rates in spite of shifts between dry and wet conditions.GLOBAL CHANGE BIOLOGY,21(2),803-815.
MLA Gao, Yang,et al."Carbon accumulation in a permafrost polygon peatland: steady long-term rates in spite of shifts between dry and wet conditions".GLOBAL CHANGE BIOLOGY 21.2(2015):803-815.
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