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scientifique

Model-based investigation on the effects of spatial evenness, and size selection in thinning of Picea abies stands / Peter Fransson in Scandinavian journal of forest research, vol 34 n° 3 (May 2019)  

Public [article]  inScandinavian journal of forest research > vol 34 n° 3 (May 2019) . - pp 189 - 199 Titre : Model-based investigation on the effects of spatial evenness, and size selection in thinning of Picea abies stands Type de document : Article/Communication Auteurs : Peter Fransson, Auteur ; Urban Nilsson, Auteur ; Ola Lindroos, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp 189 - 199 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] distribution spatiale [Termes descripteurs IGN] éclaircie (sylviculture) [Termes descripteurs IGN] gestion forestière durable [Termes descripteurs IGN] modèle de croissance [Termes descripteurs IGN] modèle de simulation [Termes descripteurs IGN] peuplement forestier [Termes descripteurs IGN] Picea abies [Termes descripteurs IGN] Suède [Termes descripteurs IGN] surface terrière [Vedettes matières IGN] Sylviculture Résumé : (auteur) Size and spatial distribution of trees are important for forest stand growth, but the extent to which it matters in thinning operations, in terms of wood production and stand economy, has rarely been documented. Here we investigate how the choice of spatial evenness and tree-size distribution of residual trees impacts wood production and stand economy. A spatially explicit individual-based growth model was used, in conjunction with empirical cost functions for harvesting and forwarding, to calculate net production and net present value for different thinning operations in Norway spruce stands in Northern Sweden. The in silico thinning operations were defined by three variables: (1) spatial evenness after thinning, (2) tree size preference for harvesting, and (3) basal area reduction. We found that thinning that increases spatial evenness increases net production and net present value by around 2.0%, compared to the worst case. When changing the spatial evenness in conjunction with size preference we could observe an improvement of the net production and net present value up to 8.0%. The magnitude of impact differed greatly between the stands (from 1.7% to 8.0%) and was highest in the stand with the lowest stem density. Numéro de notice : A2019-376 Thématique : FORET Nature : Article DOI : 10.1080/02827581.2019.1577914 date de publication en ligne : 17/02/2019 En ligne : https://doi.org/10.1080/02827581.2019.1577914 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93432 [article]

Attitudes towards biodiversity conservation and carbon substitution in forestry: a study of stakeholders in Sweden / Louise Eriksson in Forestry, an international journal of forest research, vol 92 n° 2 (April 2019)  

Public [article]  inForestry, an international journal of forest research > vol 92 n° 2 (April 2019) . - pp 219 - 229 Titre : Attitudes towards biodiversity conservation and carbon substitution in forestry: a study of stakeholders in Sweden Type de document : Article/Communication Auteurs : Louise Eriksson, Auteur ; Maartje J. Klapwijk, Auteur Année de publication : 2019 Article en page(s) : pp 219 - 229 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] comportement [Termes descripteurs IGN] conservation des ressources naturelles [Termes descripteurs IGN] politique de conservation (biodiversité) [Termes descripteurs IGN] puits de carbone [Termes descripteurs IGN] Suède [Vedettes matières IGN] Ecologie forestière Résumé : (Auteur) Global change has fueled debates on forest use and management, including the need to adapt management to mitigate future risks in forestry. Additionally, forests are important for biodiversity conservation and could be used in climate change mitigation. The opinions of stakeholders towards acceptable forest use deserve consideration. This study examined relations between environmental problem awareness, forest beliefs and environmental management attitudes (biodiversity conservation and carbon substitution) among stakeholders in Sweden, and explored the effect of a local biodiversity versus global climate change frame on attitudes. Stakeholders were recruited from ownership and environmental/recreational interest groups (owner and nature group, respectively) (membership sample) and among students (student sample). Whereas the owner group was more positive towards carbon substitution in forestry, the nature group was more positive towards biodiversity conservation and carbon storage. In the membership sample, awareness of biodiversity loss and eco-social forest beliefs influenced attitudes towards biodiversity conservation. In contrast, positive attitudes towards carbon substitution stemmed from lower awareness of biodiversity loss, less emphasis on openness towards new methods in forestry and greater emphasis on production in forestry. While framing did not influence attitudes, the cognitive hierarchy was useful in providing a nuanced understanding of stakeholders, valuable for policy and practice. Numéro de notice : A2019-292 Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1093/forestry/cpz003 En ligne : https://doi.org/10.1093/forestry/cpz003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93183 [article]

Thinning around old oaks in spruce production forests: current practices show no positive effect on oak growth rates and need fine tuning / Igor Drobyshev in Scandinavian journal of forest research, vol 34 n° 2 (March 2019)  

Public [article]  inScandinavian journal of forest research > vol 34 n° 2 (March 2019) . - pp 126 - 132 Titre : Thinning around old oaks in spruce production forests: current practices show no positive effect on oak growth rates and need fine tuning Type de document : Article/Communication Auteurs : Igor Drobyshev, Auteur ; Maria Koch Widerberg, Auteur ; Mikael Andersson, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp 126 - 132 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] conservation de la flore [Termes descripteurs IGN] croissance végétale [Termes descripteurs IGN] dendrochronologie [Termes descripteurs IGN] éclaircie (sylviculture) [Termes descripteurs IGN] Picea abies [Termes descripteurs IGN] politique de conservation (biodiversité) [Termes descripteurs IGN] quercus pedunculata [Termes descripteurs IGN] sécheresse [Termes descripteurs IGN] Suède [Vedettes matières IGN] Sylviculture Résumé : (auteur) The expansion of spruce-dominated forestry in Southern Sweden during the twentieth century has led to a considerable amount of oak (Quercus robur L.) woodlands being converted into stands dominated by planted spruce. The thinning of spruces around oak trees is currently done in Sweden to improve local diversity of insects, oak growing conditions and eventually decrease their mortality. To evaluate the effect of these treatments, we dendrochronologically studied growth of old (100–200 years old) oaks subjected to thinning of different intensity at nine locations in southern Sweden, and compared them to oaks located in nearby pastures. The overall pattern suggests that commonly adopted thinning intensities do not significantly affect oak growth. Oak growth was positively related to oak age and negatively to the amount of dead oak crown. Analyses of correlations between oak growth and summer drought conditions, as reflected by location-specific chronologies of the Monthly Drought Code (MDC), indicated that older trees exhibited generally negative correlations, whereas the correlation remained generally positive for the younger trees, both inside and outside forest stands. We propose that removal of spruces should be primarily done around older and healthier-looking trees. Numéro de notice : A2019-377 Thématique : FORET Nature : Article DOI : 10.1080/02827581.2018.1557247 date de publication en ligne : 23/12/2018 En ligne : https://doi.org/10.1080/02827581.2018.1557247 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93436 [article]

Optimisation of GNSS networks, considering baseline correlations / M. Amin Alizadeh-Khameneh in Survey review, vol 51 n° 364 (January 2019)  

Public [article]  inSurvey review > vol 51 n° 364 (January 2019) . - pp 35 - 42 Titre : Optimisation of GNSS networks, considering baseline correlations Type de document : Article/Communication Auteurs : M. Amin Alizadeh-Khameneh, Auteur ; Lars E. Sjöberg, Auteur ; Anna B. O. Jensen, Auteur Année de publication : 2019 Article en page(s) : pp 35 - 42 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes descripteurs IGN] corrélation [Termes descripteurs IGN] données GNSS [Termes descripteurs IGN] double différence [Termes descripteurs IGN] ligne de base [Termes descripteurs IGN] optimisation (mathématiques) [Termes descripteurs IGN] réseau géodésique local [Termes descripteurs IGN] Suède Résumé : (Auteur) By considering global navigation satellite system (GNSS) observations, one can perform optimisation according to some pre-defined criteria and come up with the best location of receivers and optimum number of baselines. In practice, it is quite common to neglect the effect of correlations between baselines, and instead assume single-baseline-adjusted data in the optimisation procedure. However, in each session of observation, usually more than two receivers are simultaneously taking data from a number of common GNSS satellites, implying that the single- or double-difference observations are correlated. Our study designs an optimal observation plan for a GPS network in Skåne in southern Sweden, with the aim of determining possible displacements. Assuming three receivers in each session of observations leads to correlation between the GPS baselines, and consequently a fully populated weight matrix for each session of observation. A bi-objective optimisation model of precision and reliability is chosen to optimise the variance factor of each session, and eventually, design an observation plan. It is shown in this study that observing six out of ten possible sessions is sufficient to enable the network to detect a 5 mm displacement at each station. Assuming that the double-difference phase observations are uncorrelated changes the observation plan by retaining two more sessions. However, defining the weight matrix based on the double-difference observations requires the correlations to be taken into account, and neglecting them leads to incorrect results. Numéro de notice : A2019-187 Thématique : POSITIONNEMENT Nature : Numéro de périodique nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00396265.2017.1342896 date de publication en ligne : 26/06/2017 En ligne : https://doi.org/10.1080/00396265.2017.1342896 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92618 [article]

La propriété en 3D : état des lieux / Anonyme in Géomatique expert, n° 123 (juillet - août 2018)

Public [article]  inGéomatique expert > n° 123 (juillet - août 2018) Titre : La propriété en 3D : état des lieux Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2018 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Cadastre [Termes descripteurs IGN] base de données foncières [Termes descripteurs IGN] base de données localisées 3D [Termes descripteurs IGN] Colombie-Britannique (Canada) [Termes descripteurs IGN] Espagne [Termes descripteurs IGN] France (administrative) [Termes descripteurs IGN] Genève [Termes descripteurs IGN] Norvège [Termes descripteurs IGN] Pologne [Termes descripteurs IGN] propriété foncière [Termes descripteurs IGN] Queensland (Australie) [Termes descripteurs IGN] Suède Résumé : (éditeur) En Suisse comme partout ailleurs, la densification du tissu urbain implique de construire des bâtiments élevés qui sont ensuite cogérés par plusieurs propriétaires. Se pose alors le problème de la représentation cadastrale, et SIG, de ces divisions en volumes. Numéro de notice : A2018-269 Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90329 [article]

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-001-P002065	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt

Optimization of deformation monitoring networks using finite element strain analysis / M. Amin Alizadeh-Khameneh in Journal of applied geodesy, vol 12 n° 2 (April 2018)  

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Terrestrial laser scanning reveals differences in crown structure of Fagus sylvatica in mixed vs. pure European forests / Ignacio Barbeito in Forest ecology and management, vol 405 (1 December 2017)  

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The influence of spatial scales on Red List composition: Forest species in Fennoscandia / Lise Tingstad in Global ecology and conservation, vol 11 (July 2017)  

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Mapping forest attributes using data from stereophotogrammetry of aerial images and field data from the national forest inventory / Jonas Bohlin in Silva fennica, vol 51 n° 2 (2017)  

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Mapping forest attributes using data from stereophotogrammetry of aerial images and field data from the national forest inventory / Jonas Bohlin in Silva fennica, vol 51 n° 2 (2017)  

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Dead wood availability in managed Swedish forests – Policy outcomes and implications for biodiversity / Bengt Gunnar Jonsson in Forest ecology and management, vol 376 (15 September 2016)  

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Extreme events and climate change: the post-disaster dynamics of forest fires and forest storms in Sweden / Rolf Lidskog in Scandinavian journal of forest research, vol 31 n° 2 (March 2016)  

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Estimation of forest biomass from two-level model inversion of single-pass InSAR data / M.J. Soja in IEEE Transactions on geoscience and remote sensing, vol 53 n° 9 (September 2015)

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Matching authority and VGI road networks using an extended node-based matching algorithm / Ehsan Abdolmajidi in Geo-spatial Information Science, vol 18 n° 2 (August 2015)  

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Determination of the local tie vector between the VLBI and GNSS reference points at Onsala using GPS measurements / Tong Ning in Journal of geodesy, vol 89 n° 7 (July 2015)  

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