Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2017
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Hadush Tsehaye Beyene May Bente Brurberg Leif Sundheim Arne Tronsmo Dereje Assefa Anne Marte TronsmoAbstract
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Maochuan Hu Takahiro Sayama Xingqi Zhang Kenji Tanaka Kaoru Takara Hong YangAbstract
Low impact development (LID) has attracted growing attention as an important approach for urban flood mitigation. Most studies evaluating LID performance for mitigating floods focus on the changes of peak flow and runoff volume. This paper assessed the performance of LID practices for mitigating flood inundation hazards as retrofitting technologies in an urbanized watershed in Nanjing, China. The findings indicate that LID practices are effective for flood inundation mitigation at the watershed scale, and especially for reducing inundated areas with a high flood hazard risk. Various scenarios of LID implementation levels can reduce total inundated areas by 2%–17% and areas with a high flood hazard level by 6%–80%. Permeable pavement shows better performance than rainwater harvesting against mitigating urban waterlogging. The most efficient scenario is combined rainwater harvesting on rooftops with a cistern capacity of 78.5 mm and permeable pavement installed on 75% of non-busy roads and other impervious surfaces. Inundation modeling is an effective approach to obtaining the information necessary to guide decision-making for designing LID practices at watershed scales.
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Ingunn M. VågenAbstract
Genetic resources of pea (Pisum sativum) may represent valuable traits for inclusion in breeding programs, but may also be valuable directly due to good adaptation to local agro-climatic conditions, or have market potential as heirloom foods. Grain legume production in Norway is limited compared to many other European countries, but increased acreage is desired and expected for several reasons. A short growing season and the specific agro-climatic conditions makes choice of genotypes important for reliable grain and protein yields. During three years, several evaluation field trials with pea genetic resources were carried out in Southern Norway, assessing morphological and phenological traits, seed yields and protein levels. The trials included pea accessions from Norway(1), Sweden(6), Finland(1), Latvia(8), Estonia(9) and Portugal(1), as well as commercial cultivars(6). The genotypes differed widely in grain yield, time and duration of flowering, maturity, plant height, and resistance to lodging. Seed protein levels ranged from 24.0 to 32.7%. Protein levels for these pea genotypes under Norwegian field conditions appear to be higher than in comparable trials in countries at lower latitudes. The research was supported by the EU FP7 project Eurolegume and NordGen (Nordic Genetic Resource Center).
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Research concerning the cultural practice of golf course fairways is important because legislation on pesticide reduction in Europe and North America may potentially cause serious weed problems. Establishing a strong, competitive turfgrass sward may aid in reducing the invasion of broadleaved weeds and Poa annua L. The objective of this research was to determine changes in the grass species composition and weed occurrence of in-use fairway turfs after repeated overseeding of three grass species separately: Lolium perenne L., Festuca rubra L., and Poa pratensis L., all at rates 300 kg ha−1. Overseeding was conducted with a disc seeder, alone or in combination with extra fertilizer (50 kg N + 34 kg P ha−1) in either May or September on three Danish golf courses from 2011 to 2013. Results showed no increase in the population of F. rubra or P. pratensis after 3 yr of overseeding. Lolium perenne was successfully introduced when seeded in autumn and when extra fertilizer was added immediately after overseeding. None of the overseeding treatments reduced the occurrence of P. annua, Taraxacum officinale F.H. Wigg., Bellis perennis L., or Trifolium repens L. The results are discussed in relation to the fact that the fairways were unirrigated and that they were open to play after overseeding.
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Ilona Kása Györgyi Gelybó Ágota Horel Zsòfia Bakacsi Eszter Tóth Sándor Koós Márton Dencső Johannes Deelstra Sándor Molnár Csilla FarkasAbstract
Catchment scale hydrological models are promising tools for simulating the effect of catchment-specific processes and management on soil and water resources. Here, we present a model intercomparison study of runoff simulations using three different semi-distributed rainfall-runoff catchment models. The objective of this study was to demonstrate the applicability of the Hydrologiska Byrans Vattenavdelning (HBV-Light); Precipitation, Evapotranspiration and Runoff Simulator for Solute Transport (PERSiST); and INtegrated CAtchment (INCA) models on Somogybabod Catchment, near Lake Balaton, Hungary. The models were calibrated and validated against observed discharge data at the outlet of the catchment for the period of January 1, 2006 –July 12, 2015. Model performance was evaluated using graphical representations, e.g. daily and monthly hydrographs and Flow Duration Curves (FDC) and model evaluation statistic; Nash–Sutcliffe efficiency (NSE) and coefficient of determination (R2). The simulation results showed that the models provided good estimates of monthly average discharge (0.60–0.90 NSE; 0.60–0.91 R2) and satisfactory results for daily discharge (0.46–0.62 NSE; 0.50–0.67 R2). We found that the application of hydrological models serves as a powerful basis for ensemble modelling of average runoff and could enhance our understanding of the eco-hydrological and transport processes within catchments. On the other hand, it can highlight the uncertainty of model forecasts and the importance of goal specific evaluation.
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Tore SkrøppaAbstract
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