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.
2023
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Taper models, which describe the shape of tree stems, are central to estimating stem volume. Literature provides both taper- and volume models for the three main species in Norway, Norway spruce, Scots pine, and birch. These models, however, were mainly developed using approaches established over 50 years ago, and without consistency between taper and volume. We tested eleven equations for taper and six equations for bark thickness. The models were fitted and evaluated using a large dataset covering all forested regions in Norway. The selected models were converted into volume functions using numerical integration, providing both with- and without-bark volumes and compared to the volume functions in operational use. Taper models resulted in root mean squared error (RMSE) of 7.2, 7.9, and 9.0 mm for spruce, pine, and birch respectively. Bark thickness models resulted in RMSE of 2.5, 6.1, and 4.1 mm, for spruce, pine, and birch respectively. Validation of volume models with bark resulted in RMSE of 12.7%, 13.0%, and 19.7% for spruce, pine, and birch respectively. Additional variables, tree age, site index, elevation, and live crown proportion, were tested without resulting in any strong increase in predictive power.
Forfattere
Ingeborg Callesen Marjo Palviainen Kęstutis Armolaitis Charlotte Rasmussen O. Janne KjønaasSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Marit Almvik Hanne Marit Gran Henriette Engen Berg Kari Stuveseth Gunvor Senneset Kathinka LangSammendrag
I 2022 ble totalt 30 prøver analysert for plantetoksiner. Av disse var det 15 prøver av barnegrøt, skumpinner og frokostblandinger som ble analysert for tropane alkaloider, i form av atropin og skopolamin. Videre ble 15 prøver av te, urtekrydder og bakeblandinger analysert for pyrrolizidinalkaloider. Det ble ikke påvist hverken atropin eller skopolamin i barnegrøt, skumpinner eller frokostblanding. Det ble ikke påvist pyrrolizidinalkaloider i bakeblandinger eller i grønn te. Det ble påvist pyrrolizidinalkaloider i begge urtekrydderne og i èn prøve urtete. En prøve urteblanding og en prøve urtete hadde nivå over nåværende grenseverdi.
Forfattere
Mirjam Vujadinović Mandić Ana Vuković Vimić Milica Fotirić Akšić Mekjell MelandSammendrag
Det er ikke registrert sammendrag
Forfattere
Aaron N. Koop Daniel R. Hirmas Sharon A. Billings Li Li Alejandro Cueva Xi Zhang Hang Wen Attila Nemes Lígia F.T. Souza Hoori Ajami Alejandro N. Flores Aoesta K. Rudick Annalise Guthrie Lola M. Klamm Micah Unruh Pamela L. SullivanSammendrag
Det er ikke registrert sammendrag
Forfattere
Ji Liu Yi Wang Yong Li Josep Peñuelas Ying Zhao Jordi Sardans Doerthe Tetzlaff Jian Liu Xinliang Liu Hongzhao Yuan Yanyan Li Ji Chen Jinshui WuSammendrag
Whether and how to synchronously regulate stream water nitrogen (N) and phosphorus (P) concentrations and ratios is a major challenge for sustainable aquatic functions. Soil carbon (C):N:P ratios influence soil N and P stocks and biogeochemical processes that elicit subsequent substantial impacts on stream water N and P concentrations and ratios. Therefore, bridging soil and stream water with ecological stoichiometry is one of the most promising technologies for improving stream water quality. Here, we quantified the ecological stoichiometry of soil and stream water relationships across nine catchments. Soil C:P ratio was the main driver of water quality, showing negative correlations with stream water N and P concentrations, and positive correlations with the N:P ratio in P-limited catchments. We revealed that soil C:P ratios higher than 97.8 mol mol−1 are required to achieve the simultaneous regulation of stream water N and P concentrations below the eutrophication threshold and make algal growth P-limited. Furthermore, we found that the relationships between catchment landscape and soil ecological stoichiometry likely provided practical options for regulating soil ecological stoichiometry. Our work highlights that soil ecological stoichiometry can effectively indicate the amount and proportion of soil N and P losses, and can be intervened through rational landscape planning to achieve sustainable aquatic ecosystems in catchments.
Sammendrag
Modern apple growing requires relatively often orchard replacement due to release of superior cultivars or introduction of new growing technologies. Most of intensive apples orchards are established in the same site where apple trees were cultivated for a long period. Continuous cultivation of the same crop causes stress to plants and often leads to abnormal plant development and decreased productivity what is known as apple replant disease (ARD). Due to ban of chemical soil disinfection, other strategies how to overcome ARD must be developed. Rootstock is becoming to be one of the most important factors to solve this problem and one of the targets of new rootstock breeding programs is rootstock resistance or tolerance to ARD. Different origin and genetic background of rootstocks led to suggest that their adaptiveness to replanted soil will be different. EUFRIN (European fruit research institutes network) Apple and pear cultivar and rootstock testing group established replant trials in several European countries where new apple rootstocks from USA, Great Britain, Poland and Russia are tested. Current paper presents results of the trial performed at the Institute of Horticulture, Lithuanian Research Centre for Agriculture and Forestry in 2017-2021. On average of all rootstocks apple trees planted in the fresh soil were by 35% more vigorous and gave 71% higher yield. After the evaluation of tree growth and productivity characters rootstocks ‘G.41’ and ‘G.11’ were the most tolerant to ARD. Trees on rootstocks ‘G.935, ‘Cepiland-Pajam®2’ and ‘EM_02’ had significantly lower yields in replant soil, while tree growth was most stunted on ‘62-396-B10®’ and ‘EM_02’.
Sammendrag
The morphological ontogeny of Nanhermannia sellnicki Forsslund, 1958 is described and illustrated. In all juvenile stages the bothridial seta is minute, and two pairs of exobothridial setae are present (exa reduced to its alveolus, exp short). In the larva, the seta f1 is setiform but in the nymphs it is unobservable among cuticular tubercles. Most prodorsal and gastronotal setae of the larva are short while thouse of nymphs are long; seta in and all gastronotal and adanal setae are inserted in small individual depressions. In all instars the leg segments are oval in cross section and relatively thick, and most setae on tarsi are relatively short, thick or conical. The seta d accompanies solenidion σ on all genua, φ1 on tibia I and φ on other tibiae.