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Organochemical characterization of peat reveals decomposition of specific hemicellulose structures as the main cause of organic matter loss in the acrotelm
Umeå universitet, Medicinska fakulteten, Institutionen för medicinsk kemi och biofysik. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.ORCID-id: 0000-0003-4803-3664
Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.ORCID-id: 0000-0001-8819-2278
UDATA GmbH - Umwelt und Bildung, Neustadt an der Weinstraße, Germany; Departement Umweltgeowissenschaften, Universität Basel, Basel, Switzerland.
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2022 (Engelska)Ingår i: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 56, nr 23, s. 17410-17419Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Peatlands store carbon in the form of dead organic residues. Climate change and human impact impose risks on the sustainability of the peatlands carbon balance due to increased peat decomposition. Here, we investigated molecular changes in the upper peat layers (0-40 cm), inferred from high-resolution vertical depth profiles, from a boreal peatland using two-dimensional 1H-13C nuclear magnetic resonance (NMR) spectroscopy, and comparison to δ13C, δ15N, and carbon and nitrogen content. Effects of hydrological conditions were investigated at respective sites: natural moist, drainage ditch, and natural dry. The molecular characterization revealed preferential degradation of specific side-chain linkages of xylan-type hemicelluloses within 0-14 cm at all sites, indicating organic matter losses up to 25%. In contrast, the xylan backbone, galactomannan-type hemicelluloses, and cellulose were more resistant to degradation and accumulated at the natural moist and drainage site. δ13C, δ15N, and carbon and nitrogen content did not correlate with specific hemicellulose structures but reflected changes in total carbohydrates. Our analysis provides novel insights into peat carbohydrate decomposition and indicates substantial organic matter losses in the acrotelm due to the degradation of specific hemicellulose structures. This suggests that variations in hemicellulose content and structure influence peat stability, which may have important implications with respect to climate change.

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS) , 2022. Vol. 56, nr 23, s. 17410-17419
Nyckelord [en]
2D NMR, acrotelm, cellulose, hemicellulose, organic matter, peat
Nationell ämneskategori
Organisk kemi
Identifikatorer
URN: urn:nbn:se:umu:diva-201476DOI: 10.1021/acs.est.2c03513ISI: 000890198000001PubMedID: 36399683Scopus ID: 2-s2.0-85142648325OAI: oai:DiVA.org:umu-201476DiVA, id: diva2:1716476
Forskningsfinansiär
WallenbergstiftelsernaKempestiftelsernaScience for Life Laboratory, SciLifeLabVetenskapsrådetCarl Tryggers stiftelse för vetenskaplig forskning Tillgänglig från: 2022-12-06 Skapad: 2022-12-06 Senast uppdaterad: 2022-12-30Bibliografiskt granskad

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Serk, HenrikFigueira, JoaoSchleucher, Jürgen

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