气候变化领域集成服务门户(CCPortal): Permafrost degradation and its consequences for carbon storage in soils of Interior Alaska

CCPortal

DOI	10.1007/s10533-024-01132-4
	Permafrost degradation and its consequences for carbon storage in soils of Interior Alaska
	Liebmann, Patrick; Barta, Jiri; Vogel, Cordula; Urich, Tim; Kholodov, Alexander; Varsadiya, Milan; Mewes, Ole; Dultz, Stefan; Waqas, Muhammad; Wang, Haitao; Shibistova, Olga; Guggenberger, Georg
发表日期	2024
ISSN	0168-2563
EISSN	1573-515X
起始页码	167
结束页码	3
卷号	167 期号:3
英文摘要	Permafrost soils in the northern hemisphere are known to harbor large amounts of soil organic matter (SOM). Global climate warming endangers this stable soil organic carbon (SOC) pool by triggering permafrost thaw and deepening the active layer, while at the same time progressing soil formation. But depending, e.g., on ice content or drainage, conditions in the degraded permafrost can range from water-saturated/anoxic to dry/oxic, with concomitant shifts in SOM stabilizing mechanisms. In this field study in Interior Alaska, we investigated two sites featuring degraded permafrost, one water-saturated and the other well-drained, alongside a third site with intact permafrost. Soil aggregate- and density fractions highlighted that permafrost thaw promoted macroaggregate formation, amplified by the incorporation of particulate organic matter, in topsoils of both degradation sites, thus potentially counteracting a decrease in topsoil SOC induced by the permafrost thawing. However, the subsoils were found to store notably less SOC than the intact permafrost in all fractions of both degradation sites. Our investigations revealed up to net 75% smaller SOC storage in the upper 100 cm of degraded permafrost soils as compared to the intact one, predominantly related to the subsoils, while differences between soils of wet and dry degraded landscapes were minor. This study provides evidence that the consideration of different permafrost degradation landscapes and the employment of soil fractionation techniques is a useful combination to investigate soil development and SOM stabilization processes in this sensitive ecosystem.
英文关键词	Climate change; Permafrost thaw; Soil development; Soil organic matter; Soil fractions; Microbial decomposition
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号	WOS:001178221600002
来源期刊	BIOGEOCHEMISTRY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/289476
作者单位	Leibniz University Hannover; University of South Bohemia Ceske Budejovice; University of South Bohemia Ceske Budejovice; Technische Universitat Dresden; Universitat Greifswald; University of Alaska System; University of Alaska Fairbanks; University of Bayreuth
推荐引用方式 GB/T 7714	Liebmann, Patrick,Barta, Jiri,Vogel, Cordula,et al. Permafrost degradation and its consequences for carbon storage in soils of Interior Alaska[J],2024,167(3).
APA	Liebmann, Patrick.,Barta, Jiri.,Vogel, Cordula.,Urich, Tim.,Kholodov, Alexander.,...&Guggenberger, Georg.(2024).Permafrost degradation and its consequences for carbon storage in soils of Interior Alaska.BIOGEOCHEMISTRY,167(3).
MLA	Liebmann, Patrick,et al."Permafrost degradation and its consequences for carbon storage in soils of Interior Alaska".BIOGEOCHEMISTRY 167.3(2024).