Areas In Southern Norway Research Articles

Harvesting changes mating behaviour in European lobster.

Removing individuals from a wild population can affect the availability of prospective mates and the outcome of competitive interactions, with subsequent effects on mating patterns and sexual selection. Consequently, the rate of harvest‐induced evolution is predicted to be strongly dependent on the strength and dynamics of sexual selection, yet there is limited empirical knowledge on the interplay between selective harvesting and the mating systems of exploited species. In this study, we used genetic parentage assignment to compare mating patterns of the highly valued and overexploited European lobster (Homarus gammarus) in a designated lobster reserve and nearby fished area in southern Norway. In the area open to fishing, the fishery is regulated by a closed season, a minimum legal size and a ban on the harvest of egg‐bearing females. Due to the differences in size and sex‐specific fishing mortality between the two areas, males and females are of approximately equal average size in the fished area, whereas males tend to be larger in the reserve. Our results show that females would mate with males larger than their own body size, but the relative size difference was significantly larger in the reserve. Sexual selection acted positively on both body size and claw size in males in the reserve, while it was nonsignificant in fished areas. This strongly suggests that size truncation of males by fishing reduces the variability of traits that sexual selection acts upon. If fisheries continue to target large individuals (particularly males) with higher relative reproductive success, the weakening of sexual selection will likely accelerate fisheries‐induced evolution towards smaller body size.

Female turnover rate differs between two Northern GoshawkAccipiter gentilisnesting areas, as revealed by DNA analysis of moulted feathers

The turnover rate of breeding Northern Goshawk Accipiter gentilis females in two study areas in southern Norway, which are assumed to experience different levels of illegal human persecution, was estimated using DNA extracted from moulted feathers, along with other characteristics. Female turnover rate over a 4-year period for each nesting territory during 1990–2015 was significantly higher in Aust-Agder County (31.9%; 23 territories), where hunters have long shown antipathy to Goshawks, than in Telemark County (17.3%; 25 territories). Turnover rate was not related to territory quality. The proportion of successful nesting attempts was lower in Aust-Agder (70–75%) than in Telemark (82–84%), but for newly built nests, which are less likely to be known by hunters, the difference was not significant (77.4 vs 79.6%). The proportion of juvenile female Goshawks among recruits and in the total breeding population also did not differ between the two areas. Our findings support the notion that Goshawk persecution was higher in Aust-Agder than in Telemark. We found that the use of phenotypic characteristics for individual recognition was successful in 96.2% of 130 comparisons of female Goshawks from two consecutive nesting attempts, when assessed using genetic markers.

Spatially consistent imputations of forest data under a semivariogram model

This study proposes a method to perform spatially consistent imputations of forest data to serve simulation studies where spatial autocorrelation is expected to have an effect (e.g., sampling simulations and forest scenario analysis). Starting with a nearest neighbour imputation, an optimization process brings the spatially comprehensive data to a desired state, controlled by a target semivariogram and a target histogram. The target values for both parameters may be approximated using empirical data and are combined in the objective function used by the optimization algorithm. Here, we demonstrate a case study using wall-to-wall airborne laser scanner data, satellite data, and field observations for an 852 ha forest area in southern Norway. Different combinations of data types and target parameters were tested, and the target values were reached in most cases. In some cases, with a more restrictive objective function, the semivariogram did not completely converge to its target values, yet still had a convergence of at least 93%, expressed by the difference reduction between initial and target values. The results recommend the proposed method as a practical means to generate spatially explicit forest data when a particular distribution and well-defined spatial dependence are required.

Nutritional self-care among a group of older home-living people in rural Southern Norway.

BackgroundOlder home-living people are an at-risk group for undernutrition, particularly those who are living alone. Lack of knowledge about healthy dietary habits, altered taste sensation, and declined health status are shown to be some of the factors related to undernutrition. The aims of this study were to explore how a small group of older people in Southern Norway perceived their nutritional self-care.MethodsAn exploratory qualitative approach, combined with a simple self-report questionnaire, was used. Five persons living in rural areas in Southern Norway, who in a former study were screened and found to be at risk for undernutrition, participated. Qualitative data assessed by means of individual self-care talks in the persons’ own homes were analyzed using directed content analysis. A simple self-report questionnaire containing demographic variables, two health-related questions, and the Nutritional Form For the Elderly (NUFFE-NO) instrument was filled out at baseline and 6 months after the self-care talks.ResultsThe qualitative data showed that the participants had adequate knowledge about healthy and nutritious diets. They were aware of and motivated to adapt their diet to their current state of health and to perform the necessary actions to maintain an optimal nutritional status and nutritional self-care.ConclusionOlder people living at home are a diverse group. However, this study showed that they may have sufficient knowledge, willingness, and ability to perform nutritional self-care, even if they live alone and have several chronic illnesses and impaired health.

Glacier area and length changes in Norway from repeat inventories

Abstract. In this study, we assess glacier area and length changes in mainland Norway from repeat Landsat TM/ETM+-derived inventories and digitized topographic maps. The multi-temporal glacier inventory consists of glacier outlines from three time ranges: 1947 to 1985 (GIn50), 1988 to 1997 (GI1990), and 1999 to 2006 (GI2000). For the northernmost regions, we include an additional inventory (GI1900) based on historic maps surveyed between 1895 and 1907. Area and length changes are assessed per glacier unit, 36 subregions, and for three main parts of Norway: southern, central, and northern. The results show a decrease in the glacierized area from 2994 km2 in GIn50 to 2668 km2 in GI2000 (total 2722 glacier units), corresponding to an area reduction of −326 km2, or −11% of the initial GIn50 area. The average length change for the full epoch (within GIn50 and GI2000) is −240 m. Overall, the comparison reveals both area and length reductions as general patterns, even though some glaciers have advanced. The three northernmost subregions show the highest retreat rates, whereas the central part of Norway shows the lowest change rates. Glacier area and length changes indicate that glaciers in maritime areas in southern Norway have retreated more than glaciers in the interior, and glaciers in the north have retreated more than southern glaciers. These observed spatial trends in glacier change are related to a combination of several factors such as glacier geometry, elevation, and continentality, especially in southern Norway.

Comparison of four types of 3D data for timber volume estimation

The study compares the accuracy of timber volume prediction based on four different three-dimensional remote sensing data sets in one study area in southern Norway: airborne laser scanning (ALS), stereo aerial photogrammetry (AP), satellite interferometric synthetic aperture radar (InSAR) based on the TanDEM-X mission, and satellite radargrammetry based on the TerraSAR-X mission. We fitted linear mixed effects models with vegetation height and density metrics obtained from the remote sensing data sets as explanatory variables. The cross-validated root mean squared error (RMSE) relative to the observed mean was used as the measure of goodness-of-fit. ALS provided the most accurate prediction at plot level with RMSE=19%, followed by AP (31%), InSAR (42%), and radargrammetry (44%). At stand level the methods' performances were equally ordered, with RMSE values of 12–23%. Including the variables terrain slope and aspect in the models improved the accuracy of AP, InSAR, and radargrammetry slightly.

Seasonal movements and dispersal patterns: Implications for recruitment and management of willow ptarmigan (Lagopus lagopus)

ABSTRACTWe investigated the general patterns of movements in willow ptarmigan (Lagopus lagopus) populations. We analyzed data from 300 radiocollared willow ptarmigan from 3 study areas in the Swedish mountain range, and from 2 previous studies of recoveries of wing‐tagged chicks from 3 areas in southern Norway. We found that 80% of juvenile females dispersed more than 5 km from their natal area, whereas only 25% of juvenile males established a summer range more than 5 km from the area where they were caught as chicks. Mean dispersal distances of juvenile females were 3 times longer (10.4 km) than those of juvenile males (2.4 km). Movement differences within sexes were not associated with apparent female breeding success or ptarmigan density in the natal area, and adult females migrated between wintering areas used as juveniles and their first breeding site. We found no differences in dispersal distances between the Norwegian and Swedish populations. Movements of adult and juvenile females during spring were similar in all respects. At scales of more than 5 km, the movements of juveniles and adult females play a role in redistributing birds within landscape units, and represent important inter‐population movements. The results of this study explain the apparent contradiction between non‐compensatory mortality based on data from radio‐marked ptarmigan, and the almost complete compensation based on annual counts. Estimating the extent of immigration into areas with high local mortality is difficult because of predation or harvest under conditions of high, fixed emigration and immigration dependent on local conditions. This represents a problem if dispersal distances include areas that are considerably larger than the size of the study area. © 2014 The Wildlife Society.

Southern Scandinavian lowland populations of Rhytidium rugosum (Hedw.) Kindb. (Bryophyta, Rhytidiaceae) differ significantly from those in the mountains

Haplotype diversity patterns based on internal transcribed spacer (ITS) and gpd (glyceraldehyde 3-phosphate dehydrogenase) in Scandinavian Rhytidium rugosum were compared between four populations from the mountain range and two in the southern lowlands. The mountain populations differ from the southern lowland ones in haplotype composition and the lowland ones differ from each other, suggesting different histories. A coalescent-based analysis (LAMARC) indicated immigration into the population now found in the mountains from that represented in the lowlands. Because several factors argue against such a dispersal scenario within the relatively short postglacial period, it is proposed that these migration patterns are older than the postglacial period. It is suggested that the mountain range populations immigrated from a source population either in the north-east or within Scandinavia, whereas the lowland populations are likely to represent remains of the glacial population of lowland Europe. The highest haplotype diversity in Scandinavia was found in the Gudbrandsdalen area in southern Norway. This is probably explained by the fact that this is the only region in Europe where R. rugosum regularly reproduces sexually. The lowest diversity was found on the Great Alvar on the island of Öland off the Baltic coast of southern Sweden, and is most likely a result of gradual loss of haplotypes over time.

Being old and living alone in urban areas: the meaning of self-care and health on the perception of life situation and identity.

BackgroundLiving alone in urban areas when getting old is an important and necessary field for research as the growth of the urban population worldwide increases, and due to the fact that people live longer. How older people manage their self-care and health, and how this might influence their identity and life situation may be very important to understand when planning for a new, upcoming older generation. The aim of this study was to elucidate the meaning of self-care and health for the perception of life situation and identity among single-living older individuals in urban areas in southern Norway.MethodsA phenomenological–hermeneutic approach inspired by Ricoeur was applied. Nine single-living older persons in urban areas, 70–82 years of age, and identified to be in good health were interviewed. The interviews were audiotaped, transcribed verbatim, and analyzed using a phenomenological–hermeneutic method.ResultsStrength and a time dimension characterized the meaning of self-care and health for the perception of life situation and identity as narrated by the group of single-living older individuals in urban areas in southern Norway. The informants were, as older individuals, caring, autonomous, and robust characters, who had gone through difficult times in life, and in a resilient way moved towards a new future. They valued and were grateful for what they had learned in their lives and could go forward and still experience and explore.ConclusionSelf-care is significant in the perception of life situation and identity among single urban older people in this study, and characterized by strength, temporality, gratitude, autonomy, and natality. Society needs to acknowledge the strengths and capabilities of older people to a greater extent.

Transient thermal modeling of permafrost conditions in Southern Norway

Abstract. Thermal modeling is a powerful tool to infer the temperature regime of the ground in permafrost areas. We present a transient permafrost model, CryoGrid 2, that calculates ground temperatures according to conductive heat transfer in the soil and in the snowpack. CryoGrid 2 is forced by operational air temperature and snow-depth products for potential permafrost areas in Southern Norway for the period 1958 to 2009 at 1 km2 spatial resolution. In total, an area of about 80 000 km2 is covered. The model results are validated against borehole temperatures, permafrost probability maps from "bottom temperature of snow" measurements and inventories of landforms indicative of permafrost occurrence. The validation demonstrates that CryoGrid 2 can reproduce the observed lower permafrost limit to within 100 m at all validation sites, while the agreement between simulated and measured borehole temperatures is within 1 K for most sites. The number of grid cells with simulated permafrost does not change significantly between the 1960s and 1990s. In the 2000s, a significant reduction of about 40% of the area with average 2 m ground temperatures below 0 °C is found, which mostly corresponds to degrading permafrost with still negative temperatures in deeper ground layers. The thermal conductivity of the snow is the largest source of uncertainty in CryoGrid 2, strongly affecting the simulated permafrost area. Finally, the prospects of employing CryoGrid 2 as an operational soil-temperature product for Norway are discussed.

Source‐to‐sink analysis of ancient sedimentary systems using a subsurface case study from the Møre‐Trøndelag area of southern Norway: Part 2 – sediment dispersal and forcing mechanisms

AbstractThe composition, volume and stratigraphic organisation of submarine fan systems deposited along continental margins are expected to reflect the landscape from which the sediment was derived. During the Late Cretaceous, the Møre‐Trøndelag margin, Norwegian North Sea was dominated by the deposition of deep‐marine fines; the emplacement of 11 sand‐rich submarine fan systems occurred only during a c. 3 Myr period in the Turonian‐Coniacian. The systems were fed by sediment that was routed through submarine canyons incised into the basin margin; the canyons are underlain by angular unconformities and are interpreted to have resulted from tectonically induced changes in slope physiography and erosion by gravity flows. The areal extent of the onshore drainage catchments that supplied sediment to the fans has been estimated based on scaling relationships derived from modern source‐to‐sink systems. The results of our study suggest that the Turonian fans were sourced by drainage catchments that were up to ca.3600 km2, extending more than ca.100 km inland from the palaeo‐shoreline. The estimated inboard catchment extent correlates with the innermost structures of a large, long‐lived, basement‐involved, normal fault complex. On the basis of our analysis, we conclude that increased sediment supply to the Turonian fan systems reflects tectonic rejuvenation of the landscape, rather than eustatic sea‐level or climate fluctuations. The duration of fan deposition is thus interpreted to reflect the ‘relaxation time’ of the landscape following tectonic perturbation, and fan system retrogradation and abandonment is interpreted to reflect the eventual depletion of the onshore sediment source. We demonstrate that a better understanding of the stratigraphic variability in deepwater depositional systems can be gained by taking a complete source‐to‐sink view of ancient sediment dispersal systems.

Source‐to‐sink analysis of ancient sedimentary systems using a subsurface case study from the Møre‐Trøndelag area of southern Norway: Part 1 – depositional setting and fan evolution

AbstractIn this study, we use seismic reflection, well and core data to investigate the role that basin physiography and sediment routing systems played on the distribution, geometry and stratigraphic architecture of Upper Cretaceous submarine fans (SF) offshore Norway. The Late Cretaceous Møre‐Trøndelag margin of western Norway was characterised by steep submarine slopes (gradient of ~0.3°–3°). Mudstones dominate the Upper Cretaceous slope succession, although a few regionally extensive, sandstone‐dominated units are developed. We focus on the most regionally extensive sandstone unit, which is of Late Turonian‐to‐Early Coniacian age. Mapping and visualisation of 2D and 3D seismic reflection data and analysis of well data indicates that the sandstone unit comprises a total of 11 SF, which were fed by sand‐rich sediment gravity flows routed through multiple upper slope canyons. Based on the internal organisation of seismic facies, four fan types have been identified: (i) Type Ia fans, which are characterised by <10 erosional channel complexes at their bases and aggradational to landward‐stepping lobes in their upper parts; (ii) Type Ib fans, which are characterised by >10 erosional channel complexes at their bases and aggradational to landward‐stepping lobe and mass‐transport deposits near the fan apex in their upper parts; (iii) Type II fans, which are dominated by aggradational lobe deposits; and (iv) Type III fans, which are dominated by a single channel complex that passes downdip into a small terminal lobe. The different fan types are interpreted to reflect variable stratigraphic responses to source proximity and basin physiography, which is principally related to the degree of local fault reactivation and differential compaction. This variability highlights the diversity of fan types that may occur over short distances along continental margins, and demonstrates the importance of local controls in understanding the internal stratigraphic variability that may be present in deep‐marine successions.

Petrogenetic implications of magmatic garnet in granitic pegmatites from Southern Norway

The magmatic garnet of seven granitic NYF (niobium–yttrium–fluorine-enriched) granitic pegmatites from the Froland and Evje–Iveland areas in southern Norway were studied with respect to their major- and trace-element composition and intracrystalline distribution of major and minor elements. The increasing average MnO/(FeO + MnO) values of the garnet grains investigated reflect the increasing fractionation of pegmatites from abyssal heavy REE to muscovite rare-element REE pegmatites. At a crystal scale, the MnO/(MnO + FeO) values show various trends controlled by coexisting Mn–Fe-consuming minerals. Back-scattered electron imaging revealed a great variety of structures, including large-scale (>100 μm) concentric growth-induced zoning, fine-scale oscillatory growth and replacement overgrowths. The structures predominantly correlate with the distribution of Y and HREE in the crystals. It is presumably the first time that such diversity has been reported from magmatic garnet originating from one area. The average Y and HREE concentrations are related to the bulk composition of the pegmatite-forming melt, whereas the intracrystalline zoning reflects the absence or presence of Y-bearing minerals or, in the case of the Slobrekka pegmatite, diffusion-controlled crystal growth. Sharp drops of the Y and HREE content record the abrupt change of “normal” peraluminous melt composition to a Na-rich aqueous silica-bearing fluid enriched in F, Rb, Cs, Ta, Mn in the case of the Solas and Hovasen pegmatites. These Na-rich aqueous silica-bearing fluids are responsible for the formation of “amazonite”–“cleavelandite” replacement units. The regional implications are, first, that the Froland pegmatites are characterized by a shorter range of pegmatite fractionation. The parent melts seem to be more primitive with respect to the differentiation of a granitic magma compared to the Evje–Iveland pegmatites, as reflected by the elevated Ca content and the smaller negative Eu anomaly of garnets at Froland. Rough estimates of the bulk composition of the pegmatites could not reveal such a difference. Second, garnet of the Evje–Iveland pegmatites shows a wider range of chemical variability and patterns of Y–HREE zoning compared to the Froland samples. Thus, the gradients of pegmatite fractionation are much stronger within the Evje–Iveland field. The Evje–Iveland melts were probably more enriched in volatiles, being partially responsible for the crystallization of common rare-metal and REE minerals.

Variability of density and bending properties of Picea abies structural timber

Density, modulus of elasticity and bending strength were measured on 333 boards from 54 Picea abies trees, sampled from six sites in a small area in southern Norway. The variability of the properties was analysed in a linear mixed model with relative tree size and log type as fixed effects, and with site and tree as random variables. Relative tree size was the most important fixed effect, and both density, MOE and MOR all decreased with increasing relative tree size. Log type explained a smaller part of the variance, but it was important when predicting MOR from MOE since these had different longitudinal variations.

Life situation and identity among single older home-living people: A phenomenological–hermeneutic study

Being able to continue living in their own home as long as possible is the general preference for many older people, and this is also in line with the public policy in the Nordic countries. The aim of this study was to elucidate the meaning of self-care and health for perception of life situation and identity among single-living older individuals in rural areas in southern Norway. Eleven older persons with a mean age of 78 years were interviewed and encouraged to narrate their self-care and health experiences. The interviews were audio taped, transcribed verbatim and analysed using a phenomenological–hermeneutic method inspired by the philosophy of Ricoeur. The findings are presented as a naïve reading, an inductive structural analysis characterized by two main themes; i.e., “being able to do” and “being able to be”, and a comprehensive interpretation. The life situation of the interviewed single-living older individuals in rural areas in southern Norway was interpreted as inevitable, appropriate and meaningful. Their identity was constituted by their freedom and self-chosen actions in their personal contexts. The overall impression was that independence and the ability to control and govern their own life in accordance with needs and preferences were ultimate goals for the study participants.

Self‐care ability among home‐dwelling older people in rural areas in southern Norway

The growing number of older people is assumed to represent many challenges in the future. Self-care ability is a crucial health resource in older people and may be a decisive factor for older people managing daily life in their own homes. Studies have shown that self-care ability is closely related to perceived health, sense of coherence and nutritional risk. The aim of this study was to describe self-care ability among home-dwelling older individuals living in rural areas in southern Norway and to relate the results to general living conditions, sense of coherence, screened nutritional state, perceived health, mental health and perceived life situation. A cross-sectional survey was carried out in rural areas in five counties in 2010. A mailed questionnaire, containing background variables, health-related questions and five instruments, was sent to a randomly selected sample of 3017 older people (65+ years), and 1050 respondents were included in the study. Data were analysed with statistical methods. A total of 780 persons were found to have higher self-care ability and 240 to have lower self-care ability using the Self-care Ability Scale for the Elderly. Self-care ability was found to be closely related to health-related issues, self-care agency, sense of coherence, nutritional state and mental health, former profession, and type of dwelling. Predictors for high self-care ability were to have higher self-care agency, not receiving family help, having low risk for undernutrition, not perceiving helplessness, being able to prepare food, being active and having lower age. When self-care ability is reduced in older people, caregivers have to be aware about how this can be expressed and also be aware of their responsibility for identifying and mapping needs for appropriate support and help, and preventing unnecessary and unwanted dependency.

Estimating spruce and pine biomass with interferometric X-band SAR

The primary aim of this study was to investigate the suitability of interferometric X-band SAR (InSAR) for inventory of boreal forest biomass. We investigated the relationship between SRTM X-band InSAR height and above-ground biomass in a study area in southern Norway. We generated biomass reference data for each SRTM pixel from a field inventory in combination with airborne laser scanning (ALS). One set of forest inventory plots served for calibrating ALS based biomass models, and another set of field plots was used to validate these models. The biomass values obtained in this way ranged up to 250t/ha at the stand level. The relationship between biomass and InSAR height was linear, no apparent saturation effect was present, and the accuracy was high (RMSE=19%). The relationship differed between Norway spruce and Scots pine, where an increase in InSAR height of 1m corresponded to an increase in biomass of 9.9 and 7.0t/ha, respectively. Using a high-quality terrain model from ALS enabled biomass to be estimated with a higher accuracy as compared to using a terrain model from topographic maps. Interferometric X-band SAR appears to be a promising method for forest biomass monitoring.

Side Effects of Liming - A Study of Four Dimictic Lakes in Southern Norway

Side effects related to liming have been studied in four dimictic lakes (553–642 m a.s.l.; 59°57′N) in Finnemarka, a forested area in Southern Norway with poor catchment buffer capacity. Data series from lake profiles have been sampled two decades apart; 10 years prior to liming and after 10 years of liming. Water samples were collected during spring after ice breakup and during summer after the development of thermal stratification. Before liming, there were very low concentrations of bicarbonate (HCO 3 – ; or alkalinity) in the lakes. After 10 years of liming, up to 90% of the ions in hypolimnion originate from lime products. Hence, liming strengthened the chemical stratification and increased the vertical stability. Differences in chemocline developments between lakes were explained by differences in physical properties, i.e. their depth/surface area ratio. The chemocline developments lead to increased concentrations of organic matter in the hypolimnion with a subsequent reduction in oxygen concentrations. Lime additions during late spring, as an alternative to early autumn, lead to pronounced anoxic conditions in the hypolimnion.

Effects of freeze–thaw on C and N release from soils below different vegetation in a montane system: a laboratory experiment

AbstractUnstable snow cover and more frequent freeze–thaw events have been predicted for montane areas in southern Norway, where stable winters are common today. These systems are important contributors to the flux of carbon (C) and nitrogen (N) to air and water. Here we quantify and compare the effects of freeze–thaw on C and N release from soils collected below Calluna, Molinia or Sphagnum. Intact organic soil cores were subjected to four different freeze–thaw regimes for four consecutive 2‐week periods: (1) slow cycling (SC) with one long freezing event during each 2‐week period, (2) fast cycling (FC) with four short freezing events during each 2‐week period, (3) permanent frost (PF) and (4) permanent thaw (PT). The freezing temperature was −5 °C and the thawing temperature was 5 °C. Before start of treatment, at the end of each 2‐week period, and during postincubation periods, carbon dioxide (CO2) emission as well as leachable dissolved organic C (DOC), dissolved organic N (DON), ammonium (NH4), nitrate (NO3) and absorbance at 254 nm were measured. In soils from all three vegetations, PF increased the release of CO2, DOC, DON and NH4 compared with PT. SC caused some scattered effects whereas FC only resulted in some increase in NO3 release below Molinia. Generally, the emission of CO2 and leaching of DOC, DON and NH4 increased in the following order: Sphagnum < Calluna < Molinia. The release of NO3 was greatest below Calluna. Our data suggest that vegetation cover and composition seem at least as important as increased soil frost for future winter fluxes of CO2, DOC, DON and dissolved inorganic N (DIN) from the soil to air and water. The freezing period needs to be sufficiently long to give significant effects.

Manipulation of Snow in Small Headwater Catchments at Storgama, Norway: Effects on Leaching of Inorganic Nitrogen

We have manipulated the winter-time soil temperature regime of small headwater catchments in a montane heathland area of southern Norway to study the possible effects on concentrations and fluxes of inorganic nitrogen in runoff. The experiments included extra insulation of soils in two catchments to prevent subzero temperatures during winter, and removal of snow in two other catchments to promote soil frost. Increased soil temperatures during winter increased the springtime concentrations and fluxes of ammonium (NH4) and nitrate (NO3) in runoff. By contrast, snow removal with development of significant soil frost showed no systematic effects on mean concentrations or fluxes of inorganic N. The results from our experiments suggest that warmer soils during winter caused by exceptionally mild winters, or alternatively a heavy snowpack, imply a greater risk for inorganic N leaching in this region than a possible increase of soil frost events because of reduced snow cover.