Descripteur
Documents disponibles dans cette catégorie (122)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Utilisation de SIG pour l'étude de la diffusion spatiale des métaux lourds : cas de la décherge contrôlée de jebel Chakir (Tunisie) / Fethi Bouzayania in Géomatique expert, n° 110 (mai - juin 2016)
[article]
Titre : Utilisation de SIG pour l'étude de la diffusion spatiale des métaux lourds : cas de la décherge contrôlée de jebel Chakir (Tunisie) Type de document : Article/Communication Auteurs : Fethi Bouzayania, Auteur ; Abdelwaheb Aydia, Auteur ; Nesrine Ouchira, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 42 - 47 Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] cartographie statistique
[Termes IGN] déchet
[Termes IGN] métal
[Termes IGN] risque de pollution
[Termes IGN] risque environnemental
[Termes IGN] surveillance écologiqueRésumé : (auteur) [introduction] [...] En Tunisie, les études sur la pollution des milieux naturels par les métaux lourds issus des décharges sont encore à leur début. Les travaux menés jusqu'ici sont ceux de Marzougui et Ben Mammou (2006), Bouzayani et al., 2014 et Aydi, 2015. On note aussi que ces études se sont intensifiées depuis que l'on a constaté que la contamination des sols pouvait avoir de graves influences sur l'environnement.
C'est dans ce contexte général que s'inscrit la présente étude, qui se propose d'évaluer l'impact environnemental de la diffusion des polluants engendrés par le lixiviat de la décharge de Jebel Chakir sur le sol, et ce par le biais de techniques géomatiques performantes permettant d'étudier la migration spatiale des polluants dans le sol de cette décharge.Numéro de notice : A2016-389 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81175
in Géomatique expert > n° 110 (mai - juin 2016) . - pp 42 - 47[article]Réservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 265-2016031 RAB Revue Centre de documentation En réserve L003 Disponible IFN-001-P001847 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt Comparative analysis on utilisation of linear spectral unmixing and band ratio methods for processing ASTER data to delineate bauxite over a part of Chotonagpur plateau, Jharkhand, India / Arindam Guha in Geocarto international, vol 31 n° 3 - 4 (March - April 2016)
[article]
Titre : Comparative analysis on utilisation of linear spectral unmixing and band ratio methods for processing ASTER data to delineate bauxite over a part of Chotonagpur plateau, Jharkhand, India Type de document : Article/Communication Auteurs : Arindam Guha, Auteur ; K. Vinod Kumar, Auteur Année de publication : 2016 Article en page(s) : pp 367 - 384 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image mixte
[Termes IGN] aluminium
[Termes IGN] analyse comparative
[Termes IGN] analyse discriminante
[Termes IGN] analyse linéaire des mélanges spectraux
[Termes IGN] image hyperspectrale
[Termes IGN] image Terra-ASTER
[Termes IGN] Inde
[Termes IGN] mineraiRésumé : (Auteur) We have attempted comparative analysis of the utility of linear spectral unmixing (LSU) method and band ratios for delineating bauxite from laterite within the lateritic bauxite provinces of Chotonagpur Plateau, Jharkhand of India. This was attempted based on processing of visible–near infrared (VNIR) and shortwave infrared (SWIR) spectral bands of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) sensor. In LSU method, spectral features of main constituent minerals of lateritic bauxite are used to decompose the pixel spectra to estimate the relative abundance of bauxite and laterite in each pixel to spatially delineate bauxite within laterite. We have also compared the bauxite map derived using LSU method with bauxite maps of two band ratios in terms of spatial disposition of bauxite. We also have attempted to relate the abundance values of pixels of LSU-based bauxite map with band ratio values of bauxite pixels of two selected bauxite indices. Numéro de notice : A2016-155 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106049.2015.1047471 Date de publication en ligne : 10/06/2015 En ligne : http://www.tandfonline.com/doi/full/10.1080/10106049.2015.1047471 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80395
in Geocarto international > vol 31 n° 3 - 4 (March - April 2016) . - pp 367 - 384[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 059-2016021 RAB Revue Centre de documentation En réserve L003 Disponible Plant community mycorrhization in temperate forests and grasslands: relations with edaphic properties and plant diversity / Maret Gerz in Journal of vegetation science, vol 27 n° 1 (January 2016)
[article]
Titre : Plant community mycorrhization in temperate forests and grasslands: relations with edaphic properties and plant diversity Type de document : Article/Communication Auteurs : Maret Gerz, Auteur ; Carlos Guillermo Bueno, Auteur ; Martin Zobel, Auteur ; Mari Moora, Auteur Année de publication : 2016 Article en page(s) : pp 89 - 99 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] azote
[Termes IGN] biodiversité végétale
[Termes IGN] ectomycorhize
[Termes IGN] Estonie
[Termes IGN] forêt tempérée
[Termes IGN] humidité du sol
[Termes IGN] prairie
[Vedettes matières IGN] Ecologie forestièreRésumé : (auteur) Questions : Mycorrhizal symbiosis plays a key role in plant communities. Its prevalence in plant communities (mycorrhization) at larger spatial scales has so far been mostly qualitative, while quantitative studies incorporating the mycorrhizal traits of plant species are scarce. This study aims to: (1) determine the variation in general and arbuscular mycorrhization in temperate forests and grasslands, (2) study the effects of soil N, pH and moisture on mycorrhization, and (3) determine the relationships between mycorrhization and plant diversity.
Location : Temperate forests and grasslands in Estonia, Northern Europe.
Methods : To quantify mycorrhization we used a plant community mycorrhization index – community mean of mycorrhizal status weighted by plant species abundances. The effects of edaphic factors characterized by cumulative Ellenberg values on mycorrhization were analysed using linear mixed models, and the relationship between mycorrhization and diversity was evaluated with partial correlation and variance partitioning.
Results : General mycorrhization was higher in forests and lower in grasslands, opposite to arbuscular mycorrhization. Soil N, pH and moisture negatively impacted general mycorrhization, whereas arbuscular mycorrhization was positively affected by soil pH and negatively by soil N and moisture. Plant species richness was negatively correlated with general mycorrhization in forests, whereas arbuscular mycorrhization was positively associated with plant species richness, Shannon and Simpson indices in forests and across ecosystems.
Conclusions : Mycorrhization is highly dependent on soil conditions and related to plant diversity, showing its importance for vegetation science. The plant community mycorrhization index used in this study is a promising tool for quantifying the prevalence of mycorrhizal symbiosis along environmental gradients.Numéro de notice : A2016-361 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1111/jvs.12338 En ligne : http://dx.doi.org/10.1111/jvs.12338 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81096
in Journal of vegetation science > vol 27 n° 1 (January 2016) . - pp 89 - 99[article]Phosphorus nutrition of beech (Fagus sylvatica L.) is decreasing in Europe / Ulrike Talkne in Annals of Forest Science, vol 72 n° 7 (October 2015)
[article]
Titre : Phosphorus nutrition of beech (Fagus sylvatica L.) is decreasing in Europe Type de document : Article/Communication Auteurs : Ulrike Talkne, Auteur ; Karl Josef Meiwes, Auteur ; Nenad Potočić, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 919 - 928 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] azote
[Termes IGN] croissance des arbres
[Termes IGN] défoliation
[Termes IGN] Fagus (genre)
[Termes IGN] nutriment végétal
[Termes IGN] phosphore
[Termes IGN] phytobiologie
[Termes IGN] placette d'échantillonnage
[Termes IGN] sol acide
[Vedettes matières IGN] Végétation et changement climatiqueRésumé : (auteur) Key message : Foliar phosphorus concentrations have decreased in Europe during the last 20 years. High atmospheric nitrogen deposition and climate change might be responsible for this trend. Continued decrease in foliar P concentrations might lead to reduced growth and vitality of beech forests in Europe.
Context : Increased forest soil acidification, atmospheric nitrogen deposition, and climate change have been shown to affect phosphorus nutrition of forest trees. Low foliar phosphorus levels and high nitrogen/phosphorus ratios have been observed in different European countries and have been related to reduced growth in forests.
Aims : We test the hypothesis that phosphorus concentrations of European beech (F. sylvatica L.) foliage are decreasing at the European scale.
Methods : Foliar phosphorus concentrations in beech were monitored on the basis of the “International Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests.” Here, data from 12 European countries, comprising 79 plots and a 20-year sampling period (1991–2010), were evaluated.
Results : Foliar phosphorus concentrations ranged from 0.81 to 1.66 mg g−1 dw (plot median of the 20-year sampling period). On 22 % of the plots, phosphorus concentrations were in the deficiency range of beech (Mellert and Göttlein 2012). On 62 % of the plots, the nitrogen/phosphorus ratio was above 18.9, which is considered to be disharmonious for beech. In addition, foliar phosphorus concentrations were significantly decreasing by, on average, 13 % from 1.31 to 1.14 mg g−1 in Europe (p Conclusion : Our results show that phosphorus nutrition of beech is impaired in Europe. Possible drivers of this development might be high atmospheric nitrogen deposition and climate change. Continued decrease in foliar phosphorus concentrations, eventually attaining phosphorus deficiency levels, might lead to reduced growth and vitality of beech forests in Europe.Numéro de notice : A2015-719 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s13595-015-0459-8 Date de publication en ligne : 01/10/2015 En ligne : https://doi.org/10.1007/s13595-015-0459-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78368
in Annals of Forest Science > vol 72 n° 7 (October 2015) . - pp 919 - 928[article]Variables related to nitrogen deposition improve defoliation models for European forests / Marco Ferretti in Annals of Forest Science, vol 72 n° 7 (October 2015)
[article]
Titre : Variables related to nitrogen deposition improve defoliation models for European forests Type de document : Article/Communication Auteurs : Marco Ferretti, Auteur ; Marco Calderis, Auteur ; Aldo Marchetto, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 897 - 907 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] azote
[Termes IGN] défoliation
[Termes IGN] espèce végétale
[Termes IGN] Europe (géographie physique)
[Termes IGN] Fagus (genre)
[Termes IGN] forêt
[Termes IGN] impact sur l'environnement
[Termes IGN] Picea abies
[Termes IGN] Pinus sylvestris
[Termes IGN] placette d'échantillonnage
[Termes IGN] pollution atmosphérique
[Termes IGN] surveillance de la végétationRésumé : (auteur) Key message : Atmospheric deposition of nitrogen compounds and soil and foliar variables related to N deposition resulted important factors accounting for the variability of defoliation in European forest plots.
Context : Nitrogen (N) deposition has increased in the northern hemisphere because of anthropogenic-related emission of N compounds. Increased N availability may have an adverse impact on forest sustainability.
Aims : This study aims to test the importance of throughfall N (Nthr) deposition in explaining the variability of the frequency of trees with defoliation >25 % (F 25), an indicator of forest condition.
Methods : A pan-European data set (71 plots) with enhanced quality control was considered. The additive effect of Nthr-related predictors (identified conceptually and by rank correlation) in explaining F 25 was investigated by partial least square regression in comparison with a reference model based on site, stand, management and climate data. Reported damage to foliage, Nthr deposition, foliar N ratios and mineral top-soil variables were added stepwise to the reference model.
Results : N-related variables improved defoliation models. Higher Nthr deposition led to higher F 25 for beech and Norway spruce, while the effect was opposite for Scots pine. Higher foliar N ratios led to higher F 25 for all species.
Conclusion : Nthr deposition, damage to foliage, foliar N/P, N/Ca, N/Mg, N/K, top-soil pH, C/N and exchangeable base cation resulted important factors (although with possible diverse effect) in explaining the variability of F 25 among plots.Numéro de notice : A2015-718 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s13595-014-0445-6 Date de publication en ligne : 01/10/2015 En ligne : https://doi.org/10.1007/s13595-014-0445-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78364
in Annals of Forest Science > vol 72 n° 7 (October 2015) . - pp 897 - 907[article]Prediction of the presence of topsoil nitrogen from spaceborne hyperspectral data / Binny Gopal in Geocarto international, vol 30 n° 1 - 2 (January - February 2015)PermalinkRegional gold potential mapping in Kelantan (Malaysia) using probabilistic based models and GIS / Suhaimizi Yusoff in Open geosciences, vol 7 n° 1 (January 2015)PermalinkSols et environnement, chiffres clés, édition 2015 / CGDD Commissariat Général au Développement Durable (2015)PermalinkNon-linear partial least square regression increases the estimation accuracy of grass nitrogen and phosphorus using in situ hyperspectral and environmental data / Abel Ramoelo in ISPRS Journal of photogrammetry and remote sensing, vol 82 (August 2013)PermalinkUne évaluation spatiale des risques agro-environnementaux par une modélisation multicritère combinée avec la méthode PIXAL / Francis Macary in Revue internationale de géomatique, vol 23 n° 1 (mars - mai 2013)PermalinkLandscape controls over major nutrients and primary productivity of Arctic lakes / P. Pathak in Cartography and Geographic Information Science, vol 39 n° 4 (October 2012)PermalinkUse of high-resolution satellite imagery for investigating acid mine drainage from artisanal coal mining in North-Eastern India / B. Blahwar in Geocarto international, vol 27 n° 3 (June 2012)PermalinkModelling forest management within a global vegetation model - Part 2: Model validation from a tree to a continental scale / V. Bellassen in Ecological modelling, vol 222 n° 1 (janvier 10, 2011)PermalinkModelling forest management within a global vegetation model - Part 1: Model structure and general behaviour / V. Bellassen in Ecological modelling, vol 221 n° 20 (octobre 2010)PermalinkEvaluation de teneurs en plomb dans les rejets des mines de Jalta et de Bougrine (Tunisie) en se basant sur données satellitaires (ASTER) / S. Gannouni in Photo interprétation, European journal of applied remote sensing, vol 46 n° 3-4 (septembre 2010)Permalink