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Airborne laser scanning for tree diameter distribution modelling: a comparison of different modelling alternatives in a tropical single-species plantation / Matti Maltamo in Forestry, an international journal of forest research, vol 91 n° 1 (January 2018)
[article]
Titre : Airborne laser scanning for tree diameter distribution modelling: a comparison of different modelling alternatives in a tropical single-species plantation Type de document : Article/Communication Auteurs : Matti Maltamo, Auteur ; Lauri Mehtätalo, Auteur ; R. Abdelfattah, Auteur ; Jari Vauhkonen, Auteur ; Petteri Packalen, Auteur Année de publication : 2018 Article en page(s) : pp 121 - 131 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] Brésil
[Termes IGN] diamètre à hauteur de poitrine
[Termes IGN] diamètre des arbres
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] Eucalyptus grandis
[Termes IGN] modèle numérique
[Termes IGN] plantation forestière
[Termes IGN] positionnement par GNSSMots-clés libres : Weibull distribution Résumé : (Auteur) This study examines the potential of airborne laser scanning (ALS) to predict diameter distributions in an even-aged plantation of Eucalyptus urograndis in Brazil. The single-species plantation conditions allow different modelling alternatives to be compared without the presence of minor tree species or an understory layer affecting the results. Three modelling alternatives based on the two-parametric Weibull function form; parameter prediction, parameter recovery and distribution matching were tested with a k-nearest neighbour prediction (k-nn) method. We also evaluated a parameter prediction alternative, in which the Weibull distribution was predicted using field attributes. The results showed that ALS information can predict diameter distributions with an error margin of slightly more than 10 per cent of the RMSE of the mean of the third power of diameter, and with error index values between 50 and 60. The degree of accuracy was only slightly improved when the Weibull distribution was predicted using field attributes. According to the accuracy metrics, the differences between modelling alternatives were minor but parameter recovery and k-nn seem to be the most favourable ALS-based prediction methods. To conclude, the results showed a strong relationship between ALS information and diameter distributions in a tropical single-species plantation and we discuss how these results could be applied in other types of forests. Numéro de notice : A2018-633 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1093/forestry/cpx041 En ligne : https://doi.org/10.1093/forestry/cpx041 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93233
in Forestry, an international journal of forest research > vol 91 n° 1 (January 2018) . - pp 121 - 131[article]Assessing forest windthrow damage using single-date, post-event airborne laser scanning data / Gherardo Chirici in Forestry, an international journal of forest research, vol 91 n° 1 (January 2018)
[article]
Titre : Assessing forest windthrow damage using single-date, post-event airborne laser scanning data Type de document : Article/Communication Auteurs : Gherardo Chirici, Auteur ; Francesca Bottalico, Auteur ; Francesca Giannetti, Auteur ; Barbara Del Perugia, Auteur ; Davide Travaglini, Auteur ; et al., Auteur Année de publication : 2018 Article en page(s) : pp 27 - 37 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] arbre urbain
[Termes IGN] dommage matériel
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] peuplement forestier
[Termes IGN] tempête
[Termes IGN] Toscane (Italie)
[Termes IGN] zone urbaineRésumé : (Auteur) One of many possible climate change effects in temperate areas is the increase of frequency and severity of windstorms; thus, fast and cost efficient new methods are needed to evaluate wind-induced damages in forests. We present a method for assessing windstorm damages in forest landscapes based on a two-stage sampling strategy using single-date, post-event airborne laser scanning (ALS) data. ALS data are used for delineating damaged forest stands and for an initial evaluation of the volume of fallen trees. The total volume of fallen trees is then estimated using a two-stage model-assisted approach, where variables from ALS are used as auxiliary information in the difference estimator. In the first stage, a sample of the delineated forest stands is selected, and in the second stage the within-stand damages are estimated by means of line intercept sampling (LIS). The proposed method produces maps of windthrown areas, estimates of forest damages in terms of the total volume of fallen trees, and the uncertainty of the estimates. A case study is presented for a large windstorm that struck the Tuscany Region of Italy the night of the 4th and the 5th of March 2015 and caused extensive damages to trees in both forest and urban areas. The pure field-based estimates from LIS and the ALS-based estimates of stand-level fallen wood were very similar. Our positive results demonstrate the utility of the single-date approach for a fast assessment of windthrow damages in forest stands which is especially useful when pre-event ALS data are not available. Numéro de notice : A2018-630 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1093/forestry/cpx029 Date de publication en ligne : 06/07/2017 En ligne : https://doi.org/10.1093/forestry/cpx029 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93215
in Forestry, an international journal of forest research > vol 91 n° 1 (January 2018) . - pp 27 - 37[article]Changement climatique et toponymie : Écologie historique du houx et du buis à travers leurs traces toponymiques / Emilien Conte (2018)
Titre : Changement climatique et toponymie : Écologie historique du houx et du buis à travers leurs traces toponymiques Type de document : Mémoire Auteurs : Emilien Conte, Auteur Editeur : Paris : Université de Paris 1 Panthéon Sorbonne Année de publication : 2018 Autre Editeur : Paris : Université de Paris 7 Denis Diderot Importance : 49 p. Format : 21 x 30 cm Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Toponymie
[Termes IGN] aire de répartition
[Termes IGN] analyse diachronique
[Termes IGN] Buxus sempervirens
[Termes IGN] changement climatique
[Termes IGN] France (administrative)
[Termes IGN] ilex aquifolium
[Termes IGN] indicateur biologiqueIndex. décimale : DCAR Mémoires de l'ex DESS cartographie et du Master CARTHAGEO Résumé : (auteur) Les toponymes sont, entre autres choses, une expression du lien entre les sociétés et leur environnement. Les noms de lieux qui désignent des espèces végétales peuvent être vus comme une trace de la présence passée de ces espèces. La géographie des toponymes, lorsqu’elle est comparée aux données environnementales présentes, nous renseigne sur l’évolution de l’environnement. En explorant la toponymie du houx (Ilex aquifolium) et du buis (Buxus sempervirens) en France et en les confrontant aux conditions actuelles, nous avons pu observer les dynamiques historiques de ces deux espèces à une large échelle. L’expansion de l’aire de répartition du houx en France en lien avec l’augmentation générale de la température a pu être constatée et le caractère bioindicateur de l’arbuste a été confirmé. L’étude des toponymes du buis a montré que la géographie de cette espèce doit, en dehors de sa zone d’extension continue, être analyser en lien avec le rôle majeur des sociétés humaines et la complexité de son maintien malgré la glaciation a également été rendu visible. // Toponyms are, among other things, an expression of the link between societies and their environment. Place names that designate plant species can be seen as a record of the past range of these species. The geography of toponyms, when compared with current environmental data, gives us insights on the evolution of the environment. By exploring the toponymy of holly (Ilex aquifolium) and box-tree (Buxus sempervirens) in France and comparing them to current conditions, we have been able to observe the historical dynamics of these two species on a large scale. The expansion of the holly's range in France in connection with the general increase of temperature was noted and the bioindicator capacity of this shrub was confirmed. The study of box-tree toponyms has shown that the geography of this species must be analyzed outside its continuous extension area in relation to the major role of human societies. Finally, the complexity of its upkeep during glacial period has also been seen. Numéro de notice : 17538 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE/TOPONYMIE Nature : Mémoire master cartographie Organisme de stage : IGN Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91183 Réservation
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Changement climatique et toponymie - pdf auteurAdobe Acrobat PDF Climate change risk to forests in China associated with warming / Yunhe Yin in Scientific reports, vol 8 (2018)
[article]
Titre : Climate change risk to forests in China associated with warming Type de document : Article/Communication Auteurs : Yunhe Yin, Auteur ; Danyang Ma, Auteur ; Shaohong Wu, Auteur Année de publication : 2018 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] changement climatique
[Termes IGN] Chine
[Termes IGN] croissance des arbres
[Termes IGN] écologie forestière
[Termes IGN] forêt tropicale
[Termes IGN] production primaire nette
[Termes IGN] risque naturel
[Termes IGN] sécheresse
[Termes IGN] vingt-et-unième siècle
[Vedettes matières IGN] Végétation et changement climatiqueRésumé : (auteur) Variations in forest net primary productivity (NPP) reflects the combined effects of key climate variables on ecosystem structure and function, especially on the carbon cycle. We performed risk analysis indicated by the magnitude of future negative anomalies in NPP in comparison with the natural interannual variability to investigate the impact of future climatic projections on forests in China. Results from the multi-model ensemble showed that climate change risk of decreases in forest NPP would be more significant in higher emission scenario in China. Under relatively low emission scenarios, the total area of risk was predicted to decline, while for RCP8.5, it was predicted to first decrease and then increase after the middle of 21st century. The rapid temperature increases predicted under the RCP8.5 scenario would be probably unfavorable for forest vegetation growth in the long term. High-level risk area was likely to increase except RCP2.6. The percentage area at high risk was predicted to increase from 5.39% (2021–2050) to 27.62% (2071–2099) under RCP8.5. Climate change risk to forests was mostly concentrated in southern subtropical and tropical regions, generally significant under high emission scenario of RCP8.5, which was mainly attributed to the intensified dryness in south China. Numéro de notice : A2018-009 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1038/s41598-017-18798-6 En ligne : http://dx.doi.org/10.1038/s41598-017-18798-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89002
in Scientific reports > vol 8 (2018)[article]A comparative analysis of the NDVIg and NDVI3g in monitoring vegetation phenology changes in the Northern Hemisphere / Qing Chang in Geocarto international, vol 33 n° 1 (January 2018)
[article]
Titre : A comparative analysis of the NDVIg and NDVI3g in monitoring vegetation phenology changes in the Northern Hemisphere Type de document : Article/Communication Auteurs : Qing Chang, Auteur ; Jiahua Zhang, Auteur ; Wenzhe Jiao, Auteur ; Fengmei Yao, Auteur Année de publication : 2018 Article en page(s) : pp 1 - 20 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse comparative
[Termes IGN] analyse spatio-temporelle
[Termes IGN] données spatiotemporelles
[Termes IGN] hémisphère Nord
[Termes IGN] image NOAA-AVHRR
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] phénologie
[Termes IGN] surveillance de la végétation
[Vedettes matières IGN] Végétation et changement climatiqueRésumé : (Auteur) Phenology is a sensitive and critical feature of vegetation and is a good indicator for climate change studies. The global inventory modelling and mapping studies (GIMMS) normalized difference vegetation index (NDVI) has been the most widely used data source for monitoring of the vegetation dynamics over large geographical areas in the past two decades. With the release of the third version of the NDVI (GIMMS NDVI3g) recently, it is important to compare the NDVI3g data with those of the previous version (NDVIg) to link existing studies with future applications of the NDVI3g in monitoring vegetation phenology. In this study, the three most popular satellite start of vegetation growing season (SOS) extraction methods were used, and the differences between SOSg and SOS3g arising from the methods were explored. The amplitude and the peak values of the NDVI3g are higher than those of the NDVIg curve, which indicated that the SOS derived from the NDVIg (SOSg) was significantly later than that derived from the NDVI3g (SOS3g) based on all the methods, for the whole northern hemisphere. In addition, SOSg and SOS3g both showed an advancing trend during 1982–2006, but that trend was more significant with SOSg than with SOS3g in the results from all three methods. In summary, the difference between SOSg and SOS3g (in the multi-year mean SOS, SOS change slope and the turning point in the time series) varied among the methods and was partly related to latitude. For the multi-year mean SOS, the difference increased with latitude intervals in the low latitudes (0–30°N) and decreased in the mid- and high-latitude intervals. The GIMMS NDVI3g data-sets seemed more sensitive than the GIMMS NDVIg in detecting information about the ground, and the SOS3g data were better correlated both with the in situ observations and the SOS derived from the Moderate Resolution Imaging Spectroradiometer NDVI. For the northern hemisphere, previous satellite measures (SOS derived from GIMMS NDVIg) may have overestimated the advancing trend of the SOS by an average of 0.032 d yr–1. Numéro de notice : A2018-029 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106049.2016.1222633 En ligne : https://doi.org/10.1080/10106049.2016.1222633 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89198
in Geocarto international > vol 33 n° 1 (January 2018) . - pp 1 - 20[article]Réservation
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