Theis Kragh

Search results

• 2025

  Biomanipulation af Bromme Lillesø 2023-24: Afrapportering til Sorø Kommune og Miljøstyrelsen, januar 2025

  Polauke, E. D. R., Carl, H. & Kragh, T., 8. Jan 2025, 21 p.

  Research output: Book/report › Report › Commissioned

• Effekter af sedimentfjernelse i Ormstrup sø

  Polauke, E. D. R., Kragh, T. (Member of author group), Sø, J. S. (Member of author group), Sand-Jensen, K. (Member of author group) & Reitzel, K. (Member of author group), 5. Feb 2025.

  Research output: Contribution to conference without publisher/journal › Poster › Research › peer-review

  File

• Environmental drivers of seasonal and hourly fluxes of methane and carbon dioxide across a lowland stream network with mixed catchment

  Olsen, B. W., Kragh, T., Sø, J. S., Polauke, E. & Sand-Jensen, K., 2025, In: Biogeochemistry. 168, 1, p. 14 1 p., 4.

  Research output: Contribution to journal › Journal article › Research › peer-review

• Fagtekst: Højmosen – et kæmpe kulstoflager: Sø og mose som naturbaseret løsning - Et Grønnere Klima

  Polauke, E. D. R. & Kragh, T., 13. Feb 2025, 4 p. Københavns Universitet.

  Research output: Other contribution › Net publication - Internet publication › Education › peer-review

  Open Access

• Fagtekst: Søer, kulstof og klima: Sø og mose som naturbaseret løsning - Et Grønnere Klima

  Polauke, E. D. R. & Kragh, T., 13. Feb 2025, 6 p. Københavns Universitet.

  Research output: Other contribution › Net publication - Internet publication › Education › peer-review

  Open Access
• 2024

  Global Lake Health in the Anthropocene: Societal Implications and Treatment Strategies

  Weyhenmeyer, G. A., Chukwuka, A. V., Anneville, O., Brookes, J., Carvalho, C. R., Cotner, J. B., Grossart, H.-P., Hamilton, D. P., Hanson, P. C., Hejzlar, J., Hilt, S., Hipsey, M. R., Ibelings, B. W., Jacquet, S., Kangur, K., Kragh, T., Lehner, B., Lepori, F., Lukubye, B. & Marce, R. & 12 others, McElarney, Y., Paule-Mercado, M. C., North, R., Rojas-Jimenez, K., Rusak, J. A., Sharma, S., Scordo, F., de Senerpont Domis, L. N., Sø, J. S., Wood, S. A., Xenopoulos, M. A. & Zhou, Y., 2024, In: Earth's Future. 12, 4, 24 p., e2023EF004387.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File
  22 Downloads (Pure)

• Hourly methane and carbon dioxide fluxes from temperate ponds

  Sø, J. S., Martinsen, K. T., Kragh, T. & Sand-Jensen, K., Feb 2024, In: Biogeochemistry. 167, 2, p. 177-195

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Methane 100%
  • Annuals 20%
  • Photosystem 10%
  • Global Warming 10%
  • Grassland 10%
  33 Downloads (Pure)

• Presence of oxygen in diffusive equilibrium in thin films (DET) probes: Effect on phosphate and iron porewater profiles and advice for correct deoxygenation and handling procedures

  Klamt, A. M., Kragh, T., Glud, R. N., Wagner, C. M. & Reitzel, K., Oct 2024, In: Limnology and Oceanography: Methods. 22, 10, p. 759-770

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Thin Films 100%
  • Diffusive 100%
  • Deoxygenation 100%
  • Porewater 100%
  • Film 100%

• Recycling of phosphorus from dredged lake sediment: Importance of iron-bound phosphates for plant growth

  Haasler, S., Kragh, T., Magid, J., Gunnarsen, K. C., Müller-Stöver, D., Klamt, A. M., Krogstrup, K., Sorensen, H., Nielsen, U. G. & Reitzel, K., 2024, In: Sustainable Environment. 10, 1, 2362503.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Lacustrine Deposit 100%
  • Vivianite 75%
  • Eutrophication 50%
  • Water Column 25%
  • Food Production 25%
  35 Downloads (Pure)

• Self-Made Equipment for Automatic Methane Diffusion and Ebullition Measurements From Aquatic Environments

  Sø, J. S., Sand-Jensen, K. & Kragh, T., Jun 2024, In: Journal of Geophysical Research: Biogeosciences. 129, 6, 13 p., e2024JG008035.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Methane 100%
  • Boiling 100%
  • Aquatic Environment 100%
  • Oxide Semiconductors 100%
  • Emissions 80%
  10 Downloads (Pure)

• Water quality in a shallow eutrophic lake is unaffected by extensive thinning of planktivorous and benthivorous fish species

  Polauke, E., Stage Sø, J., Carl, H., Rask Møller, P., Reitzel, K., Sand-Jensen, K. & Kragh, T., Apr 2024, In: Journal of Environmental Management. 356, 13 p., 120570.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Macrophyte 100%
  • Europeans 66%
  • Bream 66%
  • Perch 33%
  • Fish Communities 33%
  17 Downloads (Pure)
• 2023

  Environmental predictors of lake fish diversity across gradients in lake age and spatial scale

  Martinsen, K. T., Kristensen, E., Baastrup-Spohr, L., Søndergaard, M., Carl, H., Jeppesen, E., Sand-Jensen, K. & Kragh, T., Jul 2023, In: Freshwater Biology. 68, 7, p. 1122-1135

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Land Use 100%
  • Surface Area 50%
  • Surface Water 50%
  • Freshwater Ecosystem 50%
  • Lowlands 50%
  31 Downloads (Pure)

• Et studie i sørestaurering med Phoslock

  Polauke, E. D. R., Kragh, T., Wagner Møller, C., Søndergaard, M. & Reitzel, K., Dec 2023, In: Vand & Jord. 4, 2023, p. 46-49

  Research output: Contribution to journal › Journal article › Research

• Filsøs Rovaborrer 2013-2022: Udsætningen af gydemodne aborrers (Perca fluviatilis) effekter på fiskesammensætning Danmarks største genetablerede sø

  Polauke, E. D. R. & Kragh, T., Feb 2023.

  Research output: Contribution to conference without publisher/journal › Poster › Communication

• FluxSeparator - Separation of diffusive and ebullitive fluxes

  Sø, J. S. (Producer), Sand-Jensen, K. (Producer) & Kragh, T. (Contributor), 2023, (Submitted)

  Research output: Non-textual form › Computer programme › Research

• High spatiotemporal variation of CH4 and CO2 fluxes from inundated areas in a temperate fen

  Kjær, J. E., Fredriksson, F., Martinsen, K. T., Jessen, S., Michelson, B. F., Kragh, T., Sand-Jensen, K., Sø, J. S. & Baastrup-Spohr, L., 16. Nov 2023, 25 p.

  Research output: Other contribution › Research

• Methane and carbon dioxide fluxes at high spatiotemporal resolution from a small temperate lake

  Sø, J. S., Sand-Jensen, K., Martinsen, K. T., Polauke, E., Kjær, J. E., Reitzel, K. & Kragh, T., 20. Jun 2023, In: Science of the Total Environment. 878, 11 p., 162895.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Methane 100%
  • Carbon Dioxide 100%
  • Boiling 30%
  • Water Temperature 10%
  • Deep Water 10%
  111 Downloads (Pure)

• Nyt udstyr måler tabene af metan og CO2 fra søer

  Sø, J. S., Sand-Jensen, K., Martinsen, K. T. & Kragh, T., 25. May 2023

  Research output: Other contribution › Communication

  Open Access

• Temporarily and frequently occurring summer stratification and its effects on nutrient dynamics, greenhouse gas emission and fish habitat use: case study from Lake Ormstrup (Denmark)

  Søndergaard, M., Nielsen, A., Skov, C., Baktoft, H., Reitzel, K., Kragh, T. & Davidson, T. A., Jan 2023, In: Hydrobiologia. 850, 1, p. 65-79

  Research output: Contribution to journal › Journal article › Research › peer-review

  • Denmark 100%
  • Greenhouse Gas Emission 100%
  • Habitat Use 100%
  • Water Column 33%
  • Nutrient Cycling 33%
• 2022

  Ecosystem metabolism and gradients of temperature, oxygen and dissolved inorganic carbon in the littoral zone of a macrophyte-dominated lake

  Martinsen, K. T., Zak, N. B., Baastrup-Spohr, L., Kragh, T. & Sand-Jensen, K., Dec 2022, In: Journal of Geophysical Research: Biogeosciences. 127, 12, e2022JG007193.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Dissolved Inorganic Carbon 100%
  • Macrophyte 100%
  • Intertidal Zone 100%
  • Inorganic Carbon 100%
  • Charophyta 50%
  36 Downloads (Pure)

• Environmental drivers and sources of stream oxygen consumption in an agricultural lake catchment

  Sø, J. S., Kragh, T., Sand-Jensen, K. & Martinsen, K. T., Mar 2022, In: Ecological Engineering. 176, 11 p., 106516.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Organic Matter 100%
  • Fish Kill 80%
  • Denmark 20%
  • Farmland 20%
  • Climate Change 20%
  48 Downloads (Pure)

• External Phosphorus Loading in New Lakes

  Kragh, T., Kolath, T., Kolath, A. S., Jensen, K. R., Martinsen, K. T., Søndergaard, M., Hoffmann, C. C., Baastrup-Spohr, L. & Egemose, S., 22. Mar 2022, In: Water. 14, 7, 1008.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Waste Water Treatment 100%
  • Land Use 100%
  38 Downloads (Pure)

• Removal of chromophoric dissolved organic matter under combined photochemical and microbial degradation as a response to different irradiation intensities

  Kragh, T., Sand-Jensen, K., Kristensen, E., Pedersen, O. & Madsen-Østerbye, M., Aug 2022, In: Journal of Environmental Sciences. 118, p. 76-86

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Organic Material 100%
  • Microbial Biodegradation 100%
  • Organic Matter 100%
  • Organic Carbon 100%
  • Annuals 100%
  62 Downloads (Pure)

• Vandløbenes CO2-overmætning og biodiversitet

  Sand-Jensen, K., Martinsen, K. T., Kjær, J. E., Sø, J. S., Baumane, M., Kragh, T., Båstrup-Spohr, L., Bruun, H. H. & Riis, T., 2022, In: Vand & Jord. 2, 2022, p. 44-48

  Research output: Contribution to journal › Journal article › Research

• Wind drives fast changes of light climate in a large, shallow re-established lake

  Martinsen, K. T., Kragh, T., Sand-Jensen, K., Madsen-Østerbye, M., Kristensen, E. & Sø, J. S., 1. Feb 2022, In: Science of the Total Environment. 806, Part 3, 11 p., 151354.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Wind Direction 100%
  • Wind Velocity 75%
  • Light Attenuation 50%
  • Denmark 25%
  • Organic Matter 25%
  63 Downloads (Pure)
• 2021

  Bæredygtig søforvaltning: et paradigmeskift i restaureringen af søer

  Reitzel, K., Søndergaard, M., Olsen, S. B., Davidson, T., Egemose, S., Haasler, S., Klamt, A.-M., Kragh, T., Lolck, M. L., Christensen, M. L., Muff, J., Nielsen, A., Nielsen, U. G., Ottosen, L. M., Polauke, E. D. R., Smith, A. M., Sø, J. S., Trolle, D., Xu, E. G. & Skov, C., May 2021, In: Vand & Jord. 2, 2021, p. 78-80

  Research output: Contribution to journal › Journal article › Research

• Biomanipulation i Bromme Lillesø 2019-2021: Afrapportering til Sorø Kommune og Miljøstyrelsen

  Polauke, E. D. R., Carl, H., Rask Møller, P., Borg Pedersen, L. & Kragh, T., 1. Nov 2021, 21 p.

  Research output: Book/report › Report › Commissioned

• Kalken i naturens processer

  Sand-Jensen, K., Sø, J. S., Kristensen, E. & Kragh, T., 2021, In: Aktuel Naturvidenskab. 1, 2021, 5 p.

  Research output: Contribution to journal › Journal article › Research

• Large pools and fluxes of carbon, calcium and phosphorus in dense charophyte stands in ponds

  Sand-Jensen, K., Martinsen, K. T., Jakobsen, A. L., Sø, J. S., Madsen-Østerbye, M., Kjær, J. E., Kristensen, E. & Kragh, T., 15. Apr 2021, In: Science of the Total Environment. 765, 12 p., 142792.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Isotopes of Calcium 100%
  • Carbonic Acid 100%
  • Charophyta 100%
  • Sodium Bicarbonate 36%
  • Photosystem 36%
  86 Downloads (Pure)

• Optimal physical design in a new lake for reducing phosphorus pools

  Sø, J. S., Sand-Jensen, K. & Kragh, T., 1. Mar 2021, In: Ecological Engineering. 161, 8 p., 106160.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Denmark 100%
  • Water Depth 100%
  • Deep Water 100%
  • Shallow Water 100%
  • Europe 100%
  62 Downloads (Pure)
• 2020

  Carbon dioxide efflux and ecosystem metabolism of small forest lakes

  Martinsen, K. T., Kragh, T. & Sand-Jensen, K., 30. Nov 2020, In: Aquatic Sciences. 82, 1, 17 p., 9.

  Research output: Contribution to journal › Journal article › Research › peer-review

  • Oxygen Production 100%
  • Anoxic Sediment 100%
  • Carbon Dioxide 100%
  • Partial Pressure 50%
  • Time Series 50%

• Carbon Dioxide Partial Pressure and Emission Throughout the Scandinavian Stream Network

  Martinsen, K. T., Kragh, T. & Sand-Jensen, K., Dec 2020, In: Global Biogeochemical Cycles. 34, 12, 14 p., e2020GB006703.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Emissions 100%
  • Partial Pressure 100%
  • Carbon Dioxide 100%
  • Stream Channel 100%
  • Inland Water 100%
  83 Downloads (Pure)

• Early fish colonization and community development in a shallow re-established lake

  Kristensen, E., Sand-Jensen, K., Kristensen, J. S. B., Pedersen, M. E., Baastrup-Spohr, L. & Kragh, T., 1. Aug 2020, In: Ecological Engineering. 155, 9 p., 105956.

  Research output: Contribution to journal › Journal article › Research › peer-review

  • Gasterosteus aculeatus 100%
  • Pike 100%
  • Esocidae 100%
  • Denmark 100%
  • Europe 100%

• Fingerprinting pike: The use of image recognition to identify individual pikes

  Kristensen, E., Sand-Jensen, K., Martinsen, K. T., Madsen-Østerbye, M. & Kragh, T., Sept 2020, In: Fisheries Research. 229, 8 p., 105622.

  Research output: Contribution to journal › Journal article › Research › peer-review

  • Pike 100%
  • Esocidae 100%
  • Raw Fish 40%
  • Equipment 20%
  • Gillnet 20%

• From drought to flood: Sudden carbon inflow causes whole-lake anoxia and massive fish kill in a large shallow lake

  Kragh, T., Martinsen, K. T., Kristensen, E. & Sand-Jensen, K., 15. Oct 2020, In: Science of the Total Environment. 739, 12 p., 140072.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Hypoxemia 100%
  • Fish Kill 100%
  • Phytoplankton 33%
  • Lake Basin 33%
  • Photosystem 16%
  117 Downloads (Pure)

• Fysisk design af nye søer kan reducere fosforpuljen og tilgodese biodiversiteten

  Sø, J. S., Sand-Jensen, K. & Kragh, T., Dec 2020, In: Vand & Jord. 4, p. 142-145

  Research output: Contribution to journal › Journal article › Research

  • Human Immunodeficiency Virus 100%

• Fødekæder i nye søer

  Jeppesen, E., Kristensen, E., Shurkhuu, T., Lauridsen, T. L., Sø, J. S., Borum, J., Egemose, S., Kragh, T., Baastrup-Spohr, L., Sand-Jensen, K. & Søndergaard, M., 2020, In: Vand & Jord. 4, p. 166-169

  Research output: Contribution to journal › Journal article › Research

• Genopretning af biodiversitet og økosystemer: Ekspertudtalelse

  Barfod, A., Bruun, H. H., Clausen, P., Dinesen, L., Egemose, S., Ejrnæs, R., Fløjgaard, C., Heilmann-Clausen, J., Kragh, T., Petersen, A. H., Rahbek, C., Roth, E., Raulund-Rasmussen, K., Schou, J. S., Svenning, J. C. & Søndergaard, M., 2020, IPBES. 17 p.

  Research output: Book/report › Report › Research

  Open Access

• Tracing the Spatial Distribution of Whole-Lake Exchange of Groundwater and Lake Water in Low-Hydraulic Gradient Systems Using delta O-18 and Electrical Conductivity and Uncertain End-Member Mixing Analysis

  Engesgaard, P., Solvang, I. S., Steiness, M., Kristensen, E., Kragh, T. & Duque, C., 2020, In: Water (Switzerland). 12, 6, 1608.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Spatial Distribution 100%
  • Lake Water 100%
  • Electrical Resistivity 100%
  • Off-Site 50%
  • Seasonality 25%
  52 Downloads (Pure)

• Vandplanternes artsrigdom og udbredelse i nye søer

  Båstrup-Spohr, L., Sø, J. S., Martinsen, K. T., Zak, N. B., Kristensen, E., Kragh, T., Søndergård, M., Borum, J. & Sand-Jensen, K., Dec 2020, In: Vand & Jord. 27, 4, p. 151-155

  Research output: Contribution to journal › Journal article › Research
• 2019

  Carbon dioxide fluxes of air-exposed sediments and desiccating ponds

  Martinsen, K. T., Kragh, T. & Sand-Jensen, K., 30. Jul 2019, In: Biogeochemistry. 144, 2, p. 165-180

  Research output: Contribution to journal › Journal article › Research › peer-review

  • Surface Water 100%
  • Carbon Dioxide 100%
  • Dynamics 100%
  • Carbon Cycle 100%
  • Water Content 100%

• Correction to: The carbon pump supports high primary production in a shallow lake (Aquatic Sciences, (2019), 81, 2, (24), 10.1007/s00027-019-0622-7)

  Andersen, M. R., Kragh, T., Martinsen, K. T., Kristensen, E. & Sand-Jensen, K., Apr 2019, In: Aquatic Sciences. 81, 2, 28.

  Research output: Contribution to journal › Comment/debate › Research › peer-review

  • Primary Production 100%
  • Aquatic Science 100%
  • Carbon Dioxide 100%
  • Lake Water 75%
  • Atmospherics 25%

• Inorganic carbon promotes photosynthesis, growth, and maximum biomass of phytoplankton in eutrophic water bodies

  Hammer, K. J., Kragh, T. & Sand-Jensen, K., 1. Nov 2019, In: Freshwater Biology. 64, 11, p. 1956-1970 15 p.

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Dissolved Inorganic Carbon 100%
  • Inorganic Carbon 100%
  • Water Body 100%
  • Photosynthesis 100%
  • Phytoplankton 100%
  56 Downloads (Pure)

• Shallow plant-dominated lakes - extreme environmental variability, carbon cycling and ecological species challenges

  Sand-Jensen, K., Andersen, M. R., Martinsen, K. T., Borum, J., Kristensen, E. & Kragh, T., 16. Aug 2019, In: Annals of Botany. 124, 3, p. 355-366

  Research output: Contribution to journal › Journal article › Research › peer-review

  • Vegetation 100%
  • Surface Water 100%
  • Photosynthesis 100%
  • Photosystem 100%
  • Bottom Water 75%

• The carbon pump supports high primary production in a shallow lake

  Andersen, M. R., Kragh, T., Martinsen, K. T., Kristensen, E. & Sand-Jensen, K., 1. Apr 2019, In: Aquatic Sciences. 81, 2, p. 1-11 24.

  Research output: Contribution to journal › Journal article › Research › peer-review

  • Dissolved Inorganic Carbon 100%
  • Primary Production 100%
  • Inorganic Carbon 100%
  • Photosystem 100%
  • Surface Water 75%
• 2018

  Adaptation and growth performance of four endangered amphibious freshwater species

  Mørk, O., Kragh, T., Kristensen, E. & Sand-Jensen, K., Nov 2018, In: Aquatic Botany. 150, p. 16-22

  Research output: Contribution to journal › Journal article › Research › peer-review

  • Eutrophication 100%
  • Cuticle 100%
  • Growth Performance 100%
  • Crassula 100%
  • Lateral Shoot 100%

• A simple and cost-efficient automated floating chamber for continuous measurements of carbon dioxide gas flux on lakes

  Martinsen, K. T., Kragh, T. & Sand-Jensen, K., 2018, In: Biogeosciences. 15, 18, p. 5565-5573

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Continuous Measurement 100%
  • Carbon Dioxide 100%
  • Global Scale 66%
  • Empirical Model 66%
  • Limitations 33%
  193 Downloads (Pure)

• Bedre og billigere teknologi til studier af klimagasser

  Kragh, T., Sand-Jensen, K. & Thorø Martinsen, K., 2018, In: Vand & Jord. 24, 2, p. 70-73 4 p.

  Research output: Contribution to journal › Journal article › Research

• Carbon limitation of lake productivity

  Kragh, T. & Sand-Jensen, K., 14. Nov 2018, In: Proceedings of the Royal Society B. 285, 1891, 9 p., 20181415.

  Research output: Contribution to journal › Journal article › Research › peer-review

  • Dissolved Inorganic Carbon 100%
  • Phytoplankton 100%
  • Carbon Dioxide 80%
  • Atmospherics 60%
  • Mesocosm 60%

• Catchment tracers reveal discharge, recharge and sources of groundwater-borne pollutants in a novel lake modelling approach

  Kristensen, E., Madsen-Østerbye, M., Massicotte, P., Pedersen, O., Markager, S. & Kragh, T., 2018, In: Biogeosciences. 15, 4, p. 1203-1216

  Research output: Contribution to journal › Journal article › Research › peer-review

  Open Access

  File

  • Organic Matter 100%
  • Dissolved Organic Carbon 66%
  • Factor Analysis 66%
  • Flow Distribution 33%
  • Cluster Analysis 33%
  76 Downloads (Pure)