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Operationalizing measurement of forest degradation: Identification and quantification of charcoal production in tropical dry forests using very high resolution satellite imagery / K. Dons in International journal of applied Earth observation and geoinformation, vol 39 (July 2015)
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Titre : Operationalizing measurement of forest degradation: Identification and quantification of charcoal production in tropical dry forests using very high resolution satellite imagery Type de document : Article/Communication Auteurs : K. Dons, Auteur ; C. Smith-Hall, Auteur ; H. Meilby, Auteur ; Rasmus Fensholt, Auteur Année de publication : 2015 Article en page(s) : pp 18 - 27 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] biomasse (combustible)
[Termes IGN] charbon de bois
[Termes IGN] classification dirigée
[Termes IGN] déboisement
[Termes IGN] extraction de traits caractéristiques
[Termes IGN] image Quickbird
[Termes IGN] pansharpening (fusion d'images)
[Termes IGN] sous-bois
[Termes IGN] TanzanieRésumé : (auteur) Quantification of forest degradation in monitoring and reporting as well as in historic baselines is among the most challenging tasks in national REDD+ strategies. However, a recently introduced option is to base monitoring systems on subnational conditions such as prevalent degradation activities. In Tanzania, charcoal production is considered a major cause of forest degradation, but is challenging to quantify due to sub-canopy biomass loss, remote production sites and illegal trade. We studied two charcoal production sites in dry Miombo woodland representing open woodland conditions near human settlements and remote forest with nearly closed canopies. Supervised classification and adaptive thresholding were applied on a pansharpened QuickBird (QB) image to detect kiln burn marks (KBMs). Supervised classification showed reasonable detection accuracy in the remote forest site only, while adaptive thresholding was found acceptable at both locations. We used supervised classification and manual digitizing for KBM delineation and found acceptable delineation accuracy at both sites with RMSEs of 25–32% compared to ground measurements. Regression of charcoal production on KBM area delineated from QB resulted in R2s of 0.86–0.88 with cross-validation RMSE ranging from 2.22 to 2.29 Mg charcoal per kiln. This study demonstrates, how locally calibrated remote sensing techniques may be used to identify and delineate charcoal production sites for estimation of charcoal production and associated extraction of woody biomass. Numéro de notice : A2015-299 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.jag.2015.02.001 En ligne : http://www.sciencedirect.com/science/article/pii/S0303243415000331 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76475
in International journal of applied Earth observation and geoinformation > vol 39 (July 2015) . - pp 18 - 27[article]Comparing individual-tree approaches for predicting height growth of underplanted seedlings / John M. Lhotka in Annals of Forest Science, vol 72 n° 4 (June 2015)
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Titre : Comparing individual-tree approaches for predicting height growth of underplanted seedlings Type de document : Article/Communication Auteurs : John M. Lhotka, Auteur ; Edward F. Loewenstein, Auteur Année de publication : 2015 Article en page(s) : pp 469 - 477 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] canopée
[Termes IGN] Géorgie (Etats-Unis)
[Termes IGN] hauteur des arbres
[Termes IGN] inventaire forestier étranger (données)
[Termes IGN] Liriodendron tulipifera
[Termes IGN] modèle de croissance végétale
[Termes IGN] plantation forestière
[Termes IGN] Quercus nigra
[Termes IGN] sous-bois
[Termes IGN] sylvicultureRésumé : (auteur) Key message : Individual-tree seeding height growth models developed using tree inventory data were comparable to those requiring the unique observation of point-based canopy structure data at each seedling.
Context : Quantitative approaches describing the relationship between canopy structure and seedling growth can inform silvicultural decision making regarding the development of tree reproduction beneath a dominant forest canopy.
Aims : Individual-tree seedling growth models with canopy structure predictors derived from tree inventory data have not been well-explored. This study compared a model framework fit using point-based measures of canopy structure observed at the seedling level to one fit using area-wide canopy structure variables derived from standard inventory plot data.
Methods : Species-specific models predicting 5-year height growth were fit for cherrybark oak (Quercus pagoda Raf.), water oak (Quercus nigra L.), and yellow-poplar (Liriodendron tulipifera L.) underplanted within a canopy structure gradient created by silvicultural manipulation of a closed-canopy forest in Georgia, USA.
Results : Though the species varied in shade tolerance and growth rates, the general relationship between the predictor variables and height growth was similar among species and model type. Models highlight the importance of including predictor variables that describe seedling size along with openness and vertical structure of the forest canopy.
Conclusion : While the two model frameworks had comparable fit statistics, the one with predictors derived from tree inventory data may have enhanced utility as it can be directly integrated into existing individual-tree forest growth simulators.Numéro de notice : A2015-424 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s13595-014-0453-6 Date de publication en ligne : 16/01/2015 En ligne : https://doi.org/10.1007/s13595-014-0453-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77014
in Annals of Forest Science > vol 72 n° 4 (June 2015) . - pp 469 - 477[article]Neighborhood greenspace and health in a large urban center / Omid Kardan in Scientific reports, vol 5 (2015)
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Titre : Neighborhood greenspace and health in a large urban center Type de document : Article/Communication Auteurs : Omid Kardan, Auteur ; Peter Gozdyra, Auteur ; Bratislav Misic, Auteur ; et al., Auteur Année de publication : 2015 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] arbre (flore)
[Termes IGN] croisement spatial
[Termes IGN] densité de la végétation
[Termes IGN] espèce végétale
[Termes IGN] milieu urbain
[Termes IGN] santé
[Termes IGN] TorontoRésumé : (auteur) Studies have shown that natural environments can enhance health and here we build upon that work by examining the associations between comprehensive greenspace metrics and health. We focused on a large urban population center (Toronto, Canada) and related the two domains by combining high-resolution satellite imagery and individual tree data from Toronto with questionnaire-based self-reports of general health perception, cardio-metabolic conditions and mental illnesses from the Ontario Health Study. Results from multiple regressions and multivariate canonical correlation analyses suggest that people who live in neighborhoods with a higher density of trees on their streets report significantly higher health perception and significantly less cardio-metabolic conditions (controlling for socio-economic and demographic factors). We find that having 10 more trees in a city block, on average, improves health perception in ways comparable to an increase in annual personal income of $10,000 and moving to a neighborhood with $10,000 higher median income or being 7 years younger. We also find that having 11 more trees in a city block, on average, decreases cardio-metabolic conditions in ways comparable to an increase in annual personal income of $20,000 and moving to a neighborhood with $20,000 higher median income or being 1.4 years younger. Numéro de notice : A2015-499 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE Nature : Article DOI : 10.1038/srep11610 En ligne : http://www.nature.com/articles/srep11610 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77326
in Scientific reports > vol 5 (2015)[article]Augmenter le niveau de production de biomasse des cultures ligneuses dédiées ou semi-dédiées. Principaux enseignements du projet SYLVA BIOM / Jean-Charles Bastien in Revue forestière française, vol 67 n° 3 (mai 2015)
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Titre : Augmenter le niveau de production de biomasse des cultures ligneuses dédiées ou semi-dédiées. Principaux enseignements du projet SYLVA BIOM Type de document : Article/Communication Auteurs : Jean-Charles Bastien, Auteur ; Alain Berthelot, Auteur ; Franck Brignolas, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 249 - 262 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] arbre (flore)
[Termes IGN] biomasse forestière
[Termes IGN] Populus (genre)
[Termes IGN] Salix (genre)
[Termes IGN] sylviculture
[Termes IGN] taillisRésumé : (auteur) Dans le cadre d’un traitement en taillis à courte ou très courte rotation (TCR et TTCR), le projet SYLVABIOM s’est appuyé sur le suivi de la croissance et de l’efficacité avec laquelle les arbres de trois espèces (Peuplier, Robinier et Saule) utilisent l’eau et l’azote dans un réseau de quatre sites ateliers, situés dans des stations contrastées. La pertinence du taux de méthylation de l’ADN en tant que marqueur précoce du niveau de productivité a également été évaluée. Dans le cadre d’un traitement en futaie à courte révolution (FCR), le projet a reposé sur la collecte de données de croissance et de biomasse dans les réseaux expérimentaux, pour construire des tarifs compartimentés (bois de tronc, écorce, branches et feuilles) d’essences forestières à croissance rapide peu ou pas documentées. Des différences significatives ont été mises en évidence, tant en TCR qu’en TTCR, entre les trois espèces, et entre génotypes au sein d’une espèce, pour la production en biomasse, ses déterminants phénologiques, foliaires et architecturaux et l’efficience d’utilisation des ressources. Les relations complexes entre ces caractères sont modulées en fonction des conditions pédoclimatiques et de la densité de plantation. La mesure du taux de méthylation de l’ADN d’apex ou de feuilles pourrait constituer un bon prédicteur du potentiel de croissance chez le Peuplier. Des productions moyennes annuelles de biomasse comprises entre 7 et 13 tonnes de matière sèche par hectare et par an peuvent être espérées autour de 20 ans avec des conifères à croissance rapide cultivés en FCR sur d’autres gammes de stations que les espèces cultivées en TCR ou TTCR. Des gains génétiques très importants sur la production de biomasse sont par ailleurs offerts par sélection de génotypes performants. Numéro de notice : A2015-837 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.4267/2042/58175 En ligne : https://doi.org/10.4267/2042/58175 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79143
in Revue forestière française > vol 67 n° 3 (mai 2015) . - pp 249 - 262[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 133-2015031 SL Revue Centre de documentation Revues en salle Disponible Do competition-density rule and self-thinning rule agree? / Sonja Vospernik in Annals of Forest Science, vol 72 n° 3 (May 2015)
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Titre : Do competition-density rule and self-thinning rule agree? Type de document : Article/Communication Auteurs : Sonja Vospernik, Auteur ; Hubert Sterba, Auteur Année de publication : 2015 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Abies (genre)
[Termes IGN] auto-éclaircie
[Termes IGN] Autriche
[Termes IGN] croissance des arbres
[Termes IGN] densité de la végétation
[Termes IGN] inventaire forestier étranger (données)
[Termes IGN] Larix decidua
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] Picea abies
[Termes IGN] Pinus nigra
[Termes IGN] Pinus pinea
[Termes IGN] Pinus sylvestris
[Vedettes matières IGN] ForesterieRésumé : (auteur) Context : The competition-density principle, which can mathematically be described by the competition-density rule, is an important principle in plant ecology. The border line relationship is the self-thinning rule. Despite the importance of both rules for forest management, they have been fit for few species.
Aims : The aim of this study is to compare competition-density rule and self-thinning rule in particular with respect to potential density for 15 species from the Austrian National Forest Inventory (ANFI).
Methods : The self-thinning line was estimated using quantile regression. The competition-density rule was fit as four- and as three-parameter model, where the fourth parameter was substituted (a) with a specific slope from the self-thinning line estimated from the ANFI and (b) Reineke’s slope (−1.605).
Results : Potential density was highest for Austrian pine and Norway spruce, followed by silver fir and Scots pine; it was considerably lower for European larch, stone pine and broadleaf species. Species-specific slopes of the self-thinning line ranged between −1.5 and −2.0 and were significantly different from Reineke’s slope for Norway spruce, European larch and European beech.
Conclusions : Using robust estimation techniques, both competition-density rule and self-thinning line can also be fit for minor species, providing an important guide for practical forest management.Numéro de notice : A2015-456 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s13595-014-0433-x Date de publication en ligne : 30/10/2014 En ligne : https://doi.org/10.1007/s13595-014-0433-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77120
in Annals of Forest Science > vol 72 n° 3 (May 2015)[article]Optimising the yield of Douglas-fir with an appropriate thinning regime / Jean-Philippe Schütz in European Journal of Forest Research, vol 134 n° 3 (May 2015)
PermalinkPas de vent, pas de bois. L’apport de la biomécanique des arbres pour comprendre la croissance puis la vulnérabilité aux vents forts des peuplements forestiers / Meriem Fournier in Revue forestière française, vol 67 n° 3 (mai 2015)
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PermalinkLes forêts tempérées face aux conséquences du changement climatique : est-il primordial de favoriser une plus forte diversité d’arbres dans les peuplements forestiers ? / Charlotte Grossiord in Revue forestière française, Vol 67 n° 2 (mars 2015)
PermalinkLes journées de la recherche 2015 à l'IGN / Anonyme in Géomatique expert, n° 103 (mars - avril 2015)
PermalinkSylvaccess : un modèle pour cartographier automatiquement l’accessibilité des forêts / Sylvain Dupire in Revue forestière française, Vol 67 n° 2 (mars 2015)
PermalinkTemporal stability of X-band single-pass InSAR heights in a spruce forest: effects of acquisition properties and season / Svein Solberg in IEEE Transactions on geoscience and remote sensing, vol 53 n° 3 (March 2015)
PermalinkValidation of terrestrial laser scanning data using conventional forest inventory methods / Taye Mengesha in European Journal of Forest Research, vol 134 n° 2 (March 2015)
PermalinkVariation in irradiance, soil features and regeneration patterns in experimental forest canopy gaps / Urša Vilhar in Annals of Forest Science, vol 72 n° 2 (March - april 2015)
PermalinkCapabilities of BIOMASS tomography for investigating tropical forests / Ho Tong Minh Dinh in IEEE Transactions on geoscience and remote sensing, vol 53 n° 2 (February 2015)
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