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
Sammendrag
Vegetasjon langs bekker og vannveier er viktig for biologisk mangfold, jordvern, erosjonskontroll, reduksjon av risiko for flom og tørke, og for elvens hydromorfologi. Copernicus Land Monitoring Service tilbyr geografiske produkter til støtte for forvaltning av land og vann. I denne rapporten analyserer vi potensialet til Riparian Zones temakart (RZ) for bruk til kartlegging og overvåking av vegetasjon langs bekker og vannveier i Norge og Polen. Vi inkluderer også analyser av temakartet Small Woody Features (SWF) innenfor områder kartlagt i RZ. Vi sammenlignet RZ med nasjonale data og flybilder for å verifisere kvaliteten til datasettet, både for status og endringer i arealdekke og arealbruk langs bekker og vannveier. Vi konkluderer med at den tematiske nøyaktigheten var ganske god for vann, jordbruksareal og skog, men at andre klasser ikke korresponderte like godt med de nasjonale dataene. Mange av avvikene kan skyldes forskjeller i klassifiseringssystemene, kildedatene og kartleggingsinstruksene for de forskjellige datasettene. I tillegg fant vi at den romlige oppløsningen av RZ er utilstrekkelig for detaljert overvåking, særlig i jordbrukslandskap. Likevel gir RZ en standardisert og harmonisert metodikk for hele Europa, og er et steg i riktig retning for å kunne overvåke arealdekke og arealbruk i disse dynamiske og viktige områdene.
Forfattere
Eldrid Lein MoltebergSammendrag
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Accurate locating and counting of litopenaeus vannamei fry can provide substantial support for vannamei fry sales and scientific feeding. However, traditional methods not only require visual observation by experts, but also are time-consuming and labor-intensive, with no guarantee to reach consensus between salesmen and customers. In contrast, more innovative methods require more expensive equipment or are only effective under specific conditions. The small size and high density nature of the shrimp fry makes its counting even more challenging. In this study, a point prediction method for counting and localization of litopenaeus vannamei fry with region-based super-resolution enhancement (PPCL-RSE) is proposed. Through the inclusion of three modules of density partitioning, high-density region expansion and regional super-resolution, the accuracy of fry counting and locating is improved. The model is deployed on a cloud server for convenient fry counting and localization based on images taken by smartphone cameras. To achieve this, we create a dataset called Vannamei-983 which contains images with more than 1,000,000 fry labeled. The proposed method shows accuracies of 99.04 % and 97.71 % in counting and localization of shrimp fry in low- and high-density images, respectively. The excellent model performance also demonstrate the effectiveness of the strategies considered in the study.
Forfattere
Stefano PulitiSammendrag
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Forfattere
Jorunn BørveSammendrag
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In the present work we have investigated the effects of abiotic and biotic factors on the growth and quality of carrots. The experiment tested how precipitation above field capacity (WATER) vs. no precipitation (DROUGHT) affect carrot growth and storability. Each treatment period lasted three weeks. We found no yield difference between the treatments at harvesting the carrots (6.6 vs. 6 t daa‑1) and the proportion of fresh roots was generally around 85%. High precipitation, especially in the latter part of the growth period, resulted in a higher proportion of cracked roots, number of roots with a lighter colour, rot in the upper part of the root and the occurrence of enlarged cork cells. After storage, we did not see any difference between the different treatments in the proportion of fresh roots. There was a slight tendency for tip rot to increase during drought at the end of the season. The soil content of phosphorous (P), potassium (K), magnesium (Mg), calcium (Ca) and sodium (Na) was reduced by high water supply, especially early in the season. The nutrient content in the roots was generally less affected by treatments than the soil mineral content. We found that the content of K and manganese (Mn) was higher at high water supply and the content of zinc (Zn) and ion (Fe) lower. The dry matter content was lowest in the treatments with a high-water supply. As the precipitation influences the soil content of some minerals, we looked at how low pH, low Ca content in the soil, would influence carrot growth. High soil pH (7.4 vs. 5.5) resulted in a higher proportion of roots with fingers when harvesting, but a lower proportion of roots with tip rot after storage (7.8 vs. 3.3%) as well as a higher proportion of healthy roots (83% vs. 67%). The conclusion is that the climatic changes where periods with high precipitation and with drought occur more often require attention to cultivation methods to reduce the negative effects.