Hopp til hovedinnholdet

Publikasjoner

NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.

2024

Til dokument

Sammendrag

Patchy global data on belowground litter decomposition dynamics limit our capacity to discern the drivers of carbon preservation and storage across inland and coastal wetlands. We performed a global, multiyear study in over 180 wetlands across 28 countries and 8 macroclimates using standardized litter as measures of “recalcitrant” (rooibos tea) and “labile” (green tea) organic matter (OM) decomposition. Freshwater wetlands and tidal marshes had the highest tea mass remaining, indicating a greater potential for carbon preservation in these ecosystems. Recalcitrant OM decomposition increased with elevated temperatures throughout the decay period, e.g., increase from 10 to 20 °C corresponded to a 1.46-fold increase in the recalcitrant OM decay rate constant. The effect of elevated temperature on labile OM breakdown was ecosystem-dependent, with tidally influenced wetlands showing limited effects of temperature compared with freshwater wetlands. Based on climatic projections, by 2050 wetland decay constants will increase by 1.8% for labile and 3.1% for recalcitrant OM. Our study highlights the potential for reduction in belowground OM in coastal and inland wetlands under increased warming, but the extent and direction of this effect at a large scale is dependent on ecosystem and OM characteristics. Understanding local versus global drivers is necessary to resolve ecosystem influences on carbon preservation in wetlands.

Til dokument

Sammendrag

Agricultural soil has great potential to address climate change issues, particularly the rise in atmospheric CO2 levels. It offers effective remedies, such as increasing soil carbon content while lowering atmospheric carbon levels. The growing interest in inoculating soil with live microorganisms aims to enhance agricultural land carbon storage and sequestration capacity, modify degraded soil ecosystems, and sustain yields with fewer synthetic inputs. Agriculture has the potential to use soil microalgae as inoculants. However, the significance of these microorganisms in soil carbon sequestration and soil carbon stabilization under field conditions has yet to be fully understood. Large-scale commercial agriculture has focused on the development and use of inoculation products that promote plant growth, with a particular emphasis on enhancing yield attributes. Gaining more profound insights into soil microalgae’s role in soil carbon cycling is necessary to develop products that effectively support soil carbon sequestration and retention. This review comprehensively explores the direct and indirect mechanisms through which soil microalgae contribute to soil carbon sequestration, highlighting their potential as microbial inoculants in agricultural settings. This study underlines the need for more research to be conducted on microalgae inoculation into agricultural soil systems aimed at mitigating carbon emissions in the near future.

Sammendrag

Tilrettelegging for blomsterrike arealer i hverdagslandskapet er viktig for å sikre mat og habitat til de pollinerende insektene. Et viktig spørsmål ved etablering av blomstereng er om blomsterfrø bør sås alene eller sammen med naturgras. Såing sammen med gras gir raskere dekning, men det er fare for at graset skal utkonkurrere markblomstene. Derfor er det viktig å velge konkurransesvake grasarter, -sorter og frøblandinger. De vanligste grasartene brukt til dette formålet er rødsvingel med lange utløpere (Festuca rubra ssp. rubra), sauesvingel (Festuca ovina) og engkvein (Agrostis capillaris). Målet med forsøket var å finne ut hvordan norsk sorter/populasjoner av naturgras påvirker etablering av blomstrende urter spontant og etter såing sammen med norsk blomsterfrøblanding. Konkurranseforholdet ble studert gjennom tre år i langgraseng (stor såmengde av gras og uten innsådd blomsterfrøblanding) og blomstereng (såmengde av gras redusert med 75% og med innsådd blomsterfrøblanding) i et forsøk Landvik fra 2018 til 2022. Til tross for større såmengde konkurrerte rødsvingel og sauesvingel mindre enn engkvein i etableringsfasen og ga rom for større etablering av markblomster. Med få unntak gav uforedlede populasjoner av engkvein og rødsvingel større dekning av markblomster enn norske rødsvingel- og engkveinsorter utvalgt for stor tørrstoffavling eller gode plenegenskaper. I løpet forsøksperioden ble det observert en stadig rikere blomstring. Til tross for liten såmengde av mange av artene ble fjorten av atten innsådde markblomster påvist de tre første årene etter såing av blomsterfrøblandingen. Best tilslag etter såing hadde tiriltunge etterfulgt av ryllik, prestekrage og rundbelg. Sammen med engsmelle og føllblom er dette arter som egner seg for hurtig etablering i norske blomsterenger og pollinatorsoner. Etableringen av selve demofeltet og innsamlingen av resultater ble finansiert via ‘Fra grasmark til blomstereng’ (10656). Selve rapportskrivingen ble finansiert av NIBIO Landvik gjennom NIBIO eiendom (19001 -G7).

Sammendrag

The OPTAIN case study teams met with stakeholder Multi-Actor Reference Groups (MARGs) for the third time to jointly discuss preliminary modelling results for specific Natural/Small Water Retention Measures (NSWRM) and obtain feedback. https://www.optain.eu/news/stakeholder-multi-actor-reference-groups-margs-met-3rd-time-jointly-discuss-preliminary

Til dokument

Sammendrag

Rising organic charge in northern freshwaters is attributed to increasing levels of dissolved natural organic matter (DNOM) and changes in water chemistry. Organic charge concentration may be determined through charge balance calculations (Org.−) or modelled (OAN−) using the Oliver and Hruška conceptual models, which are based on the density of weak acid functional sites (SD) present in DNOM. The charge density (CD) is governed by SD as well as protonation and complexation reactions on the functional groups. These models use SD as a key parameter to empirically fit the model to Org.−. Utilizing extensive water chemistry datasets, this study shows that spatial and temporal differences in SD and CD are influenced by variations in the humic-to-fulvic ratio of DNOM, organic aluminum (Al) complexation, and the mole fraction of CD to SD, which is governed by acidity. The median SD values obtained for 44 long-term monitored acid-sensitive lakes were 11.1 and 13.9 µEq/mg C for the Oliver and Hruška models, respectively. Over 34 years of monitoring, the CD increased by 70%, likely due to rising pH and declining Al complexation with DNOM. Present-day median SD values for the Oliver and Hruška models in 16 low-order streams are 13.8 and 15.8 µEq/mg C, respectively, and 10.8 and 12.5 µEq/mg C, respectively, in 10 high-order rivers.

Til dokument

Sammendrag

Over the past four decades, an increase in Dissolved Natural Organic Matter (DNOM) and colour, commonly referred to as browning, has been noted in numerous watercourses in the northern hemisphere. Understanding the fluctuations in DNOM quality is a prerequisite for gaining insights into the biogeochemical processes governing DNOM fluxes. Such knowledge is also pivotal for water treatment plants to effectively tailor their strategies for removing DNOM from raw water. The specific ultraviolet absorbance (sUVa) index has been a widely applied measurement for assessing DNOM quality. The sUVa index is the UV absorbance (OD254) of water normalized for DNOM concentration. We have used a long-term dataset spanning from 2007 to 2022, taken from the Malše River in South Bohemia, to model DNOM and the sUVa index. We have applied regression models with a process-oriented perspective and have also considered the influence of climate change. Both DNOM and the sUVa index is positively related to temperature, runoff and pH, and negatively related to ionic strength over the studied period. Two distinct model approaches were employed, both explaining about 40% of the variation in sUVa over the studied period. Based on a moderate IPCC monthly climate scenario, simulations indicate that both DNOM and the sUVa index averages remain fairly stable, with a slight increase in winter season minima projected towards the year 2099. A slight decline in summer season maxima is simulated for DNOM, while the sUVa summer maximum remain stable. These findings suggest a robust resilience in both DNOM and the sUVa index against anticipated changes in temperature and runoff for the Malše River in South Bohemia.