{"entity": "researcher", "timestamp": "2026-07-20T01:11:52.985Z", "family": "Serk", "given": "Henrik", "initials": "H", "orcid": "0000-0003-4803-3664", "affiliations": ["Department of Medical Biochemistry and Biophysics, Ume\u00e5 University, Ume\u00e5, Sweden.", "Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Ume\u00e5, Sweden."], "links": {"self": {"href": "https://publications.scilifelab.se/researcher/5d4f6829d106420ebb289795fbeb71fb.json"}, "display": {"href": "https://publications.scilifelab.se/researcher/5d4f6829d106420ebb289795fbeb71fb"}}, "publications": [{"entity": "publication", "iuid": "ca551da4056640a692d62f80c4120eed", "links": {"self": {"href": "https://publications.scilifelab.se/publication/ca551da4056640a692d62f80c4120eed.json"}, "display": {"href": "https://publications.scilifelab.se/publication/ca551da4056640a692d62f80c4120eed"}}, "title": "Organochemical Characterization of Peat Reveals Decomposition of Specific Hemicellulose Structures as the Main Cause of Organic Matter Loss in the Acrotelm.", "authors": [{"family": "Serk", "given": "Henrik", "initials": "H", "orcid": "0000-0003-4803-3664", "researcher": {"href": "https://publications.scilifelab.se/researcher/5d4f6829d106420ebb289795fbeb71fb.json"}}, {"family": "Nilsson", "given": "Mats B", "initials": "MB"}, {"family": "Figueira", "given": "Jo\u00e3o", "initials": "J"}, {"family": "Kr\u00fcger", "given": "Jan Paul", "initials": "JP"}, {"family": "Leifeld", "given": "Jens", "initials": "J", "orcid": "0000-0002-7245-9852", "researcher": {"href": "https://publications.scilifelab.se/researcher/9eec2eca03d34177879e1832c58da8ac.json"}}, {"family": "Alewell", "given": "Christine", "initials": "C"}, {"family": "Schleucher", "given": "J\u00fcrgen", "initials": "J"}], "type": "journal article", "published": "2022-11-18", "journal": {"title": "Environ. Sci. Technol.", "issn": "1520-5851", "issn-l": "0013-936X"}, "abstract": "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 \u03b413C, \u03b415N, 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. \u03b413C, \u03b415N, 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.", "doi": "10.1021/acs.est.2c03513", "pmid": "36399683", "labels": {"Swedish NMR Centre": "Collaborative"}, "xrefs": [], "notes": [], "created": "2022-11-28T13:05:31.139Z", "modified": "2025-10-17T13:03:54.403Z"}, {"entity": "publication", "iuid": "978d1a791bbf4e4f930fe29bc640f771", "links": {"self": {"href": "https://publications.scilifelab.se/publication/978d1a791bbf4e4f930fe29bc640f771.json"}, "display": {"href": "https://publications.scilifelab.se/publication/978d1a791bbf4e4f930fe29bc640f771"}}, "title": "Metabolism is a major driver of hydrogen isotope fractionation recorded in tree-ring glucose of Pinus nigra.", "authors": [{"family": "Wieloch", "given": "Thomas", "initials": "T", "orcid": "0000-0001-9162-2291", "researcher": {"href": "https://publications.scilifelab.se/researcher/ae51002869054ad981fde0c6b4d9d047.json"}}, {"family": "Grabner", "given": "Michael", "initials": "M", "orcid": "0000-0002-5220-721X", "researcher": {"href": "https://publications.scilifelab.se/researcher/aecae7b055ea4dd3ac9d57d0807a90dd.json"}}, {"family": "Augusti", "given": "Angela", "initials": "A", "orcid": "0000-0002-9591-693X", "researcher": {"href": "https://publications.scilifelab.se/researcher/02e12e062b23482993b5840a1ffe5ad2.json"}}, {"family": "Serk", "given": "Henrik", "initials": "H", "orcid": "0000-0003-4803-3664", "researcher": {"href": "https://publications.scilifelab.se/researcher/5d4f6829d106420ebb289795fbeb71fb.json"}}, {"family": "Ehlers", "given": "Ina", "initials": "I"}, {"family": "Yu", "given": "Jun", "initials": "J", "orcid": "0000-0001-5673-620X", "researcher": {"href": "https://publications.scilifelab.se/researcher/446f4e9357e843079dbcaec455f69fde.json"}}, {"family": "Schleucher", "given": "J\u00fcrgen", "initials": "J", "orcid": "0000-0002-4815-3466", "researcher": {"href": "https://publications.scilifelab.se/researcher/ad2a0d8c63a7453e9dda23cf94b9e202.json"}}], "type": "journal article", "published": "2022-04-00", "journal": {"title": "New Phytol.", "issn": "1469-8137", "volume": "234", "issue": "2", "pages": "449-461", "issn-l": "0028-646X"}, "abstract": "Stable isotope abundances convey valuable information about plant physiological processes and underlying environmental controls. Central gaps in our mechanistic understanding of hydrogen isotope abundances impede their widespread application within the plant and biogeosciences. To address these gaps, we analysed intramolecular deuterium abundances in glucose of Pinus nigra extracted from an annually resolved tree-ring series (1961-1995). We found fractionation signals (i.e. temporal variability in deuterium abundance) at glucose H1 and H2 introduced by closely related metabolic processes. Regression analysis indicates that these signals (and thus metabolism) respond to drought and atmospheric CO2 concentration beyond a response change point. They explain \u2248 60% of the whole-molecule deuterium variability. Altered metabolism is associated with below-average yet not exceptionally low growth. We propose the signals are introduced at the leaf level by changes in sucrose-to-starch carbon partitioning and anaplerotic carbon flux into the Calvin-Benson cycle. In conclusion, metabolism can be the main driver of hydrogen isotope variation in plant glucose.", "doi": "10.1111/nph.18014", "pmid": "35114006", "labels": {"Swedish NMR Centre": "Collaborative"}, "xrefs": [], "notes": [], "created": "2022-03-22T13:21:50.347Z", "modified": "2025-10-17T13:03:54.861Z"}, {"entity": "publication", "iuid": "4dd911964f7c405bb164d3592207f237", "links": {"self": {"href": "https://publications.scilifelab.se/publication/4dd911964f7c405bb164d3592207f237.json"}, "display": {"href": "https://publications.scilifelab.se/publication/4dd911964f7c405bb164d3592207f237"}}, "title": "CO2 fertilization of Sphagnum peat mosses is modulated by water table level and other environmental factors.", "authors": [{"family": "Serk", "given": "Henrik", "initials": "H", "orcid": "0000-0003-4803-3664", "researcher": {"href": "https://publications.scilifelab.se/researcher/5d4f6829d106420ebb289795fbeb71fb.json"}}, {"family": "Nilsson", "given": "Mats B", "initials": "MB", "orcid": "0000-0003-3765-6399", "researcher": {"href": "https://publications.scilifelab.se/researcher/906f0108867f4041b9effa80ae256d97.json"}}, {"family": "Figueira", "given": "Jo\u00e3o", "initials": "J"}, {"family": "Wieloch", "given": "Thomas", "initials": "T", "orcid": "0000-0001-9162-2291", "researcher": {"href": "https://publications.scilifelab.se/researcher/ae51002869054ad981fde0c6b4d9d047.json"}}, {"family": "Schleucher", "given": "J\u00fcrgen", "initials": "J", "orcid": "0000-0002-4815-3466", "researcher": {"href": "https://publications.scilifelab.se/researcher/ad2a0d8c63a7453e9dda23cf94b9e202.json"}}], "type": "journal article", "published": "2021-06-00", "journal": {"title": "Plant Cell Environ.", "issn": "1365-3040", "volume": "44", "issue": "6", "pages": "1756-1768", "issn-l": "0140-7791"}, "abstract": "Sphagnum mosses account for most accumulated dead organic matter in peatlands. Therefore, understanding their responses to increasing atmospheric CO2 is needed for estimating peatland C balances under climate change. A key process is photorespiration: a major determinant of net photosynthetic C assimilation that depends on the CO2 to O2 ratio. We used climate chambers to investigate photorespiratory responses of Sphagnum fuscum hummocks to recent increases in atmospheric CO2 (from 280 to 400 ppm) under different water table, temperature, and light intensity levels. We tested the photorespiratory variability using a novel method based on deuterium isotopomers (D6S /D6R ratio) of photosynthetic glucose. The effect of elevated CO2 on photorespiration was highly dependent on water table. At low water table (-20 cm), elevated CO2 suppressed photorespiration relative to C assimilation, thus substantially increasing the net primary production potential. In contrast, a high water table (~0 cm) favored photorespiration and abolished this CO2 effect. The response was further tested for Sphagnum majus lawns at typical water table levels (~0 and -7 cm), revealing no effect of CO2 under those conditions. Our results indicate that hummocks, which typically experience low water table levels, benefit from the 20th century's increase in atmospheric CO2 .", "doi": "10.1111/pce.14043", "pmid": "33751592", "labels": {"Swedish NMR Centre": "Collaborative"}, "xrefs": [], "notes": [], "created": "2021-12-05T14:22:45.128Z", "modified": "2025-10-17T13:03:55.793Z"}]}