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Chemical characteristics and lability of soil organic matter in permafrost terrain, European Russian Arctic
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för naturgeografi och kvartärgeologi (INK).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för naturgeografi och kvartärgeologi (INK).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologiska vetenskaper.
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nationell ämneskategori
Naturgeografi
Forskningsämne
naturgeografi
Identifikatorer
URN: urn:nbn:se:su:diva-54063OAI: oai:DiVA.org:su-54063DiVA, id: diva2:391879
Tillgänglig från: 2011-01-25 Skapad: 2011-01-25 Senast uppdaterad: 2018-01-12Bibliografiskt granskad
Ingår i avhandling
1. Quantity and quality of soil organic matter in permafrost terrain
Öppna denna publikation i ny flik eller fönster >>Quantity and quality of soil organic matter in permafrost terrain
2011 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

High latitude terrestrial ecosystems are considered key components in the global carbon (C) cycle and hold large reservoirs of soil organic carbon (SOC). Much of this is stored as soil organic matter (SOM) in permafrost soils and peat deposits and is vulnerable to remobilization under future global warming. While the large size and potential vulnerability of arctic SOM reservoirs is recognized, detailed knowledge on its landscape partitioning and quality is poor. This thesis describes total storage, landscape partitioning and lability of SOM stored in permafrost areas of Canada and Russia. Detailed studies of SOC partitioning highlight the importance of especially permafrost peatlands, but also of O-horizons in moist tundra soils and cryoturbated soil horizons. A general characterization of SOM in an area of discontinuous permafrost shows that >70% of the SOC in the landscape is stored in SOM with a low degree of decomposition. Projections of permafrost thaw predict that the amount of SOC stored in the active layer of permafrost soils in this area could double by the end of this century. A lateral expansion of current thermokarst lakes by 30 m would expose comparable amounts of SOC to degradation. The results from this thesis have demonstrated the value of high-resolution studies of SOC storage. It is found that peat plateaus, common in the sporadic and discontinuous permafrost zones, store large quantities of labile SOM and may be highly susceptible to permafrost degradation, especially thermokarst, under future climate warming. Large quantities of labile SOM is also stored in cryoturbated soil horizons which may be affected by active layer warming and deepening. The current upscaling methodology is statistically evaluated and recommendations are given for the design of future studies. To accurately predict responses of periglacial C pools to a warming climate detailed studies of SOC storage and partitioning in different periglacial landscapes are needed.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Physical Geography and Quaternary Geology (INK), Stockholm University, 2011. s. 38
Serie
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 26
Nyckelord
carbon, soil organic matter, soil organic carbon, permafrost, arctic, upscaling, peat plateau, cryoturbation, active layer, thermokarst, carbon/nitrogen ratio, stable isotopes, humification
Nationell ämneskategori
Naturgeografi
Forskningsämne
geografi med naturgeografisk inriktning
Identifikatorer
urn:nbn:se:su:diva-54041 (URN)978-91-7447-207-3 (ISBN)
Disputation
2011-02-25, De Geer salen, Geovetenskapens hus, Svante Arrhenius väg 8, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Anmärkning
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3, 4 and 5: Manuscripts.Tillgänglig från: 2011-02-03 Skapad: 2011-01-25 Senast uppdaterad: 2018-01-12Bibliografiskt granskad

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Av författaren/redaktören
Hugelius, GustafKuhry, PeterPatrick, Crill
Av organisationen
Institutionen för naturgeografi och kvartärgeologi (INK)Institutionen för geologiska vetenskaper
Naturgeografi

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