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.
2014
Authors
Åshild Kristine Andreassen Per Brandtzæg Askild Lorentz Holck Olavi Junttila Heidi Sjursen Konestabo Richard Meadow Kaare Magne Nielsen Rose Vikse Ville Erling Sipinen Anne Marthe Jevnaker Arne Mikalsen Merethe Aasmo Finne Hilde-Gunn Opsahl SortebergAbstract
Det er ikke registrert sammendrag
Authors
Åshild Kristine Andreassen Per Brandtzæg Merethe Aasmo Finne Askild Lorentz Holck Anne Marthe Jevnaker Olavi Junttila Heidi Sjursen Konestabo Richard Meadow Arne Mikalsen Kaare Magne Nielsen Monica Sanden Rose Vikse Hilde-Gunn Opsahl SortebergAbstract
Det er ikke registrert sammendrag
Authors
Åshild Kristine Andreassen Per Brandtzæg Merethe Aasmo Finne Askild Lorentz Holck Anne Marthe Jevnaker Olavi Junttila Heidi Sjursen Konestabo Richard Meadow Arne Mikalsen Kaare Magne Nielsen Monica Sanden Ville Erling Sipinen Rose Vikse Hilde-Gunn Opsahl SortebergAbstract
Det er ikke registrert sammendrag
Authors
Ellen Johanne SvalheimAbstract
Øya Jomfruland ligger ytterst i skjærgården i Kragerø kommune. På øyas vestside, inn mot Jomfrulandsrenna ligger langstrakte sandstrender og strandenger. Rett nord og sør for Tårnbrygga er det kartlagt og avgrenset to verdifulle naturtyper med havstrandenger. Her finnes trua og sjeldne arter i et gammelt, kulturbetinga sandstrand og strandengmiljø. Dette var områder som tidligere ble holdt oppe med bl.a. beiting. Disse strandengene er i dag er preget av forfall og delvis gjengroing. Bioforsk fikk i oppdrag fra Fylkesmannen i Telemark å utarbeide skjøtselsplaner for områdene i tett dialog og samarbeid med grunneierne i området, samt med aktuelle husdyreiere. Denne skjøtselsplanen er for strandengkomplekset nord for Tårnbrygga. Skjøtselsplanen danner grunnlag for videre ivaretakelse av biomangfoldverdiene i området med aktive skjøtsels og restaureringstiltak.
Authors
Thomas Holm CarlsenAbstract
Øyrekka like nord for hovedøya Vega ble vegetasjonskartlagt i 2013 for å få oversikt over vegetasjonstyper og botaniske verdier. Vegetasjonstyper etter Fremstad (1997) er fremstilt på kart og rapporten inneholder i tillegg artslister over registrerte planter. Totalt ble 155 øyer kartlagt i 2013. Kartleggingen skal brukes som grunnlag for senere utarbeiding av skjøtselsplaner og ses i sammenheng med tidligere kartlegginger og utarbeidinger av skjøtselsplaner for Vegaøyan verdensarvområde. Kartlegginga vil også gi et godt grunnlag for oppdatering av DNs Naturbase med tanke på Vegaøyans kulturlandskapsverdier.
Abstract
Driftsgranskingane er ei årleg rekneskapsgransking som omfattar om lag 870 bruk over heile landet. Grunnlagsmaterialet for denne granskinga er omfattande, og mange data vert det ikkje plass til i den landsdekkande publikasjonen. Dette notatet inneheld lokale data frå Aust-Agder, Vest-Agder og Rogaland. Notatet er basert på driftsgranskingsdata frå dei tre fylka. I alt omfattar granskinga 91 bruk frå Rogaland og 53 bruk frå Agder-fylka. Bruka vert delt inn i to regionar, «Jæren» og «Agder og Rogaland andre bygder».
Abstract
Ari M. Hietala, Volkmar Timmermann, Isabella Børja & Halvor Solheim Norwegian Forest and Landscape Institute. PO Box 115, 1431 Ås, Norway: ari.hietala@skogoglandskap.no Owing to the Gulf Stream, the northernmost European populations of several tree species are found in Norway. Common ash (Fraxinus excelsior), the only native ash species in Norway, is present in the lowlands in the southeastern part with continental climate and in southern and southwestern coastal regions with North Atlantic climate up to Central Norway. The current standing volume of ash in Norway is ca 3 mill m3 (broadleaved trees in total 220 mill m3). The first documentation of Ash Dieback (ADB) is from 2008 from a nursery in the southeastern part of the country. A survey later that year showed that dieback symptoms were present over a distance of nearly 400 km in the southeastern region. In addition to nurseries and forests, ADB symptoms were observed on roadside, alley, garden and park trees. Based on the presence of old ADB-like stem lesions detected in 2008, the pathogen must have arrived to Norway no later than 2006. In 2008, the Norwegian Food Safety Authority laid down regulations with the aim of preventing further spread of ADB. These regulations divide the country into quarantine, observation and infection-free zones, and prohibit the export of ash seedlings, seed and wood from the quarantine zone. Despite of these regulations, the disease spread rapidly along the western coast in the period between 2009 and 2013, and currently only the ash stands in Central Norway are free of the disease. The rapid spread of the disease in Norway is obviously due to airborne dispersal of pathogen ascospores. In our experimental stand in SE Norway the number of pathogen fruit bodies can be as high as 10,000 per m2 in the peak season, mid-July to mid-August. During the early morning hours the amount of pathogen ascospores at a diseased stand can exceed 100,000 ascospores per m3 air. The first symptoms of the disease, necrotic lesions on leaf blade and petiole, appear typically during the first two weeks of August in SE Norway. To observe long-term impacts of ADB, eight monitoring plots have been established in continental and North Atlantic climate zones. In SE Norway with the oldest disease history, above 60 % of the trees with a breast height diameter (BHD) below 12.5 cm have so far died or suffer from severe defoliation, 1/3 of the larger trees being affected to a similar degree. The proportions of healthy (no signs of defoliation) small and larger trees are 20% and 37%, respectively. In SW Norway with more recent disease history a similar trend is observed but the proportion of dead trees is still small. As a consequence of ADB, the Norwegian nurseries no longer grow ash seedlings. There are currently no practical control options for the disease in forestland. Several European countries have reported that even at heavily diseased ash stands there are often some ash trees that show little symptoms. This may be due to genetic variation between trees in disease resistance, a hypothesis that is currently being investigated in several European projects. Thus implementation of forest management practices that eliminate ash could have a negative effect as survival of the tree ultimately depends on selection of trees with increased disease resistance. Bibliography for Ari M. Hietala Ari M. Hietala is a Senior Forest Pathologist at the Norwegian Forest and Landscape Institute, which is a primarily government funded organisation providing scientific research and services to government, non-governmental and commercial organisations. He has worked with a range of fungal root and shoot diseases occurring on broadleaved trees and conifers indigenous to the Nordic countries. Ari and the rest of the group participate currently in several European consortia engaged in ash dieback research.
Abstract
This review identifies ‘successful’ policies for biodiversity, cultural heritage, and landscape scenery and recreation in Austria, France, Bavaria (Germany), Wales (UK), and Switzerland, and a comparison with current efforts in Norway. All of these countries face similar risks and challenges, mostly with regard to mountain areas. Sources used for the analysis were the evaluations of the national Rural Development Plans, and the midway evaluation and national ex-post evaluations of the CAP programme period 2000–2006. An evaluation of the Swiss Direct Payment System was available from 2009, as well as information about further development from 2011. Scientific papers and other official reports by, e.g., the OECD, the European Commission and the European Environmental Agency, were used as well. Expert interviews were conducted by telephone and e-mail. Measures deemed particularly successful often had very specific aims, included local information, appeared to involve fairly simple application and organization requirements, were developed and designed in cooperation with farmers and were adapted to local characteristics or challenges. Measures considered less successful were criticized for being unfair in terms of regional repartition of grants, for lacking transparency, for being applied only to small areas, and for requiring a great deal of organization and implementation work. In terms of future developments of the Norwegian agricultural and agri-environmental subsidy system we recommend examining the following particular policies more closely: the Organic Farming scheme in Austria, the Welsh whole-farm scheme Tir Gofal, and the Austrian, Bavarian and Swiss measures for cultural landscape maintenance. Since no ‘best practice’ or ‘standard design’ of agricultural support schemes has been recognized on an international level to date, an enhanced evaluation system will be as important as new and adjusted schemes. Monitoring data suitable for comparison should be collected, based on internationally defined indicators. For the time being, we suggest “double-tracked” agri-environmental support: mainly measures that have proved to be effective; but also measures where positive effects are considered very likely due to well-known cause-effect relationships, even though they may not yet have been thoroughly documented and approved, e.g. because of their long-term character or due to weaknesses in monitoring and evaluation.
Authors
Kari Marie Njåstad Steffen Adler Jens Hansen-Møller Erling Thuen Anne-Maj Gustavsson Håvard SteinshamnAbstract
Dietary phytoestrogens are metabolized or converted in the gastrointestinal tract of ruminants, only limited knowledge exists on the extent and location of this conversion in vivo. The objective of this study was to quantify the gastro-intestinal metabolism of phytoestrogens in lactating dairy cows fed silages with different botanical composition. Four lactating rumen cannulated Norwegian Red cattle were assigned to a 4 × 4 Latin square with 1 cow per treatment period of 3 wk. The 4 treatment silages were prepared from grasslands with different botanical compositions: organically managed short-term timothy (Phleum pratense L.) and red clover (Trifolium pratense L.) ley (2 yr old: ORG-SG); organically managed long-term grassland with a high proportion of unsown species (6 yr old; ORG-LG); conventionally managed perennial ryegrass (Lolium perenne L.) ley (CON-PR); and conventionally managed timothy ley (CON-TI). The herbages were cut, wilted, and preserved with additive in round bales, fed as a mix of the first and third cut at 90% of ad libitum intake, and contributed to 70% of the total dry matter intake. Milk, feed, omasal digesta, urine, and feces were collected at the end of each period and analyzed for the concentrations of phytoestrogens by using a liquid chromatography–tandem mass spectrometry technique. Concentration of total isoflavones was highest in ORG-SG and lowest in CON-TI silage, whereas the content of total lignans was highest in the grass silages. The isoflavones were extensively metabolized in the rumen on all diets, and the recovery of formononetin and daidzein in omasum, mainly as equol, averaged 0.11 mg/mg. The apparent intestinal metabolism was less severe as, on average, 0.29 mg/mg of the omasal flow was recovered in feces. The plant lignans were also strongly degraded in the rumen. However, the flow of lignans to omasum and excretion in feces were, on average, 7.2- and 5.2-fold higher, respectively, than the intake of the plant lignans matairesinol and secoisolariciresinol, known as precursors of mammalian lignans. Thus, excretion to milk could not be directly related to intake, implying that plant lignans other than matairesinol and secoisolariciresinol in forage are precursors for enterolactone production in the rumen and for its content in milk. Equol followed mainly the flow of large particles out of the rumen, whereas the mammalian lignans were distributed between phases proportional to dry matter flow. The main metabolism of phytoestrogens occurred in the rumen and the main route of excretion was through feces and urine, with only a small part being excreted in milk. The concentration of phytoestrogens in milk can be manipulated through intake but the intermediate transfer capacity to milk appears to be limited by saturation
Authors
Simon Foteck Fonji Gregory TaffAbstract
Land-use and land-cover change (LULCC), especially those caused by human activities, is one of the most important components of global environmental change (Jessen 3rd edition: 1-526 2005). In this study the effects of geographic and demographic factors on LULCC are analyzed in northeastern Latvia using official estimates from census and vital statistics data, and using remotely sensed satellite imagery (Landsat Thematic Mapper) acquired from 1992 and 2007. The remote sensing images, elevation data, in-situ ground truth and ground control data (using GPS), census and vital statistics data were processed, integrated, and analyzed in a geographic information system (GIS). Changes in six categories of land-use and land-cover (wetland, water, agriculture, forest, bare field and urban/suburban) were studied to determine their relationship to demographic and geographic factors between 1992 and 2007. Supervised classifications were performed on the Landsat images. Analysis of land cover change based on “change-to” categories between the 1992 and 2007 images revealed that changes to forest were the most common type of change (17.1% of pixels), followed by changes to agriculture (8.6%) and the fewest were changes to urban/suburban (0.8%). Integration of population data and land-cover change data revealed key findings: areas near to roads underwent more LULCC and areas far away from Riga underwent less LULCC. Range in elevation was positively correlated with all LULCC categories. Population density was found to be associated with most LULCC categories but the direction of effect was scale dependent. This paper shows how socio-demographic data can be integrated with satellite image data and cartographic data to analyze drivers of LULCC at multiple spatial scales.