气候变化领域集成服务门户(CCPortal): Soil pore network response to freeze-thaw cycles in permafrost aggregates

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DOI	10.1016/j.geoderma.2021.115674
	Soil pore network response to freeze-thaw cycles in permafrost aggregates
	Rooney, Erin C.; Bailey, Vanessa L.; Patel, Kaizad F.; Dragila, Maria; Battu, Anil K.; Buchko, Alexander C.; Gallo, Adrian C.; Hatten, Jeffery; Possinger, Angela R.; Qafoku, Odeta; Reno, Loren. R.; SanClements, Michael; Varga, Tamas; Lybrand, Rebecca A.
发表日期	2022
ISSN	0016-7061
EISSN	1872-6259
卷号	411
英文摘要	Climate change in Arctic landscapes may increase freeze-thaw frequency within the active layer as well as newly thawed permafrost. Freeze-thaw is a highly disruptive process that can deform soil pores and alter the architecture of the soil pore network with varied impacts to water transport and retention, redox conditions, and microbial activity. Our objective was to investigate how freeze-thaw cycles impacted the pore network of newly thawed permafrost aggregates to improve understanding of what type of transformations can be expected from warming Arctic landscapes. We measured the impact of freeze-thaw on pore morphology, pore throat diameter distribution, and pore connectivity with X-ray computed tomography (XCT) using six permafrost aggregates with sizes of 2.5 cm3 from a mineral soil horizon (Bw; 28-50 cm depths) in Toolik, Alaska. Freeze-thaw cycles were performed using a laboratory incubation consisting of five freeze-thaw cycles (-10 C to 20 C) over five weeks. Our findings indicated decreasing spatial connectivity of the pore network across all aggregates with higher frequencies of singly connected pores following freeze-thaw. Water-filled pores that were connected to the pore network decreased in volume while the overall connected pore volumetric fraction was not affected. Shifts in the pore throat diameter distribution were mostly observed in pore throats ranges of 100 mu m or less with no corresponding changes to the pore shape factor of pore throats. Responses of the pore network to freeze-thaw varied by aggregate, suggesting that initial pore morphology may play a role in driving freeze-thaw response. Our research suggests that freeze-thaw alters the microenvironment of permafrost aggregates during the incipient stage of deformation following permafrost thaw, impacting soil properties and function in Arctic landscapes undergoing transition.
英文关键词	Pore morphology; Pore connectivity; Freeze thaw; Microscale; Permafrost thaw; Arctic; Aggregates
语种	英语
WOS研究方向	Soil Science
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000795841200002
来源期刊	GEODERMA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/280687
作者单位	Oregon State University; United States Department of Energy (DOE); Pacific Northwest National Laboratory; United States Department of Energy (DOE); Pacific Northwest National Laboratory; Oregon State University; Virginia Polytechnic Institute & State University; Oregon State University; University of California System; University of California Davis
推荐引用方式 GB/T 7714	Rooney, Erin C.,Bailey, Vanessa L.,Patel, Kaizad F.,et al. Soil pore network response to freeze-thaw cycles in permafrost aggregates[J],2022,411.
APA	Rooney, Erin C..,Bailey, Vanessa L..,Patel, Kaizad F..,Dragila, Maria.,Battu, Anil K..,...&Lybrand, Rebecca A..(2022).Soil pore network response to freeze-thaw cycles in permafrost aggregates.GEODERMA,411.
MLA	Rooney, Erin C.,et al."Soil pore network response to freeze-thaw cycles in permafrost aggregates".GEODERMA 411(2022).