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Base cation cycling in a pristine watershed of the Canadian boreal forest / Louis Duchesne in Biogeochemistry, vol 78 n° 2 (April 2006)
[article]
Titre : Base cation cycling in a pristine watershed of the Canadian boreal forest Type de document : Article/Communication Auteurs : Louis Duchesne, Auteur ; Daniel Houle, Auteur Année de publication : 2006 Article en page(s) : pp 195 - 216 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] acidification des sols
[Termes IGN] Canada
[Termes IGN] exploitation forestière
[Termes IGN] forêt boréale
[Termes IGN] nutriment végétal
[Termes IGN] sol acideRésumé : (auteur) Base cation cycling was investigated on the Canadian Shield in a pristine catchment of the boreal forest. An input–output budget (atmospheric deposition – stream exports) for the whole watershed indicated that nitrogen (N) was strongly retained, while sulphur (S) and base cations (K, Ca, Mg) were lost. The S losses are attributed to internal sources, such as SO4 desorption and/or mineralisation of soil organic-S. The base cation losses at the catchment scale, however, might be contributed by weathering of the till below the rooting zone, which has little ecological significance. For this reason, a detailed budget of basic cations, including atmospheric deposition, tree uptake, mineral weathering and leaching losses was constructed for the soil rooting zone of a stand representative of the forest covering the catchment. Different scenarios of tree uptake (whole tree and stem-only harvesting), weathering rates (PROFILE modelled values, PROFILE modelled values corrected for soil Na leaching) and soil leaching losses (depth of 22 and 81 cm) were considered. The element budgets were summed for the 1997–2003 (7 years) period. In every scenario, K was lost (−35.5 to −1.2 kg ha−1) from the exchangeable reservoir. Gain or losses of Ca were observable, depending of the scenario considered (28.8 to −20.1 kg ha−1) while Mg (−0.8 to 13.3 kg ha−1) generally accumulated over the 7-year period. The absolute K losses are very important, given the very small K soil exchangeable reservoir (55.2 kg ha−1) at the site. Because the amount of K sequestered in biomass (110 kg ha−1) is twice the amount found in the exchangeable soil reservoir, this forest is very sensitive to commercial forestry operations and forest harvesting appears as the main pathway of base cation losses. This raises important questions regarding the sustainability of the boreal forest that lies on K-poor soils of the Canadian Shield. Numéro de notice : A2006-662 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s10533-005-4174-7 En ligne : https://doi.org/10.1007/s10533-005-4174-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88994
in Biogeochemistry > vol 78 n° 2 (April 2006) . - pp 195 - 216[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité IFN-001-000245 423 DUC Tiré à part Nogent-sur-Vernisson Bibliothèque Nogent IFN Exclu du prêt A simple and effective radiometric correction method to improve landscape change detection across sensors and across time / X. Chen in Remote sensing of environment, vol 98 n° 1 (30/09/2005)
[article]
Titre : A simple and effective radiometric correction method to improve landscape change detection across sensors and across time Type de document : Article/Communication Auteurs : X. Chen, Auteur ; Lee Alexander Vierling, Auteur ; D. Deering, Auteur Année de publication : 2005 Article en page(s) : pp 63 - 79 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] analyse comparative
[Termes IGN] correction radiométrique
[Termes IGN] couvert végétal
[Termes IGN] détection de changement
[Termes IGN] données multitemporelles
[Termes IGN] Enhanced vegetation index
[Termes IGN] forêt boréale
[Termes IGN] groupe
[Termes IGN] image Landsat
[Termes IGN] image multitemporelle
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] régression
[Termes IGN] SibérieRésumé : (Auteur) Satellite data offer unrivaled utility in monitoring and quantifying large scale land cover change over time. Radiometric consistency among collocated multi-temporal imagery is difficult to maintain, however, due to variations in sensor characteristics, atmospheric conditions, solar angle, and sensor view angle that can obscure surface change detection. To detect accurate landscape change using multitemporal images, we developed a variation of the pseudoinvariant feature (PIF) normalization scheme: the temporally invariant cluster (TIC) method. Image data were acquired on June 9, 1990 (Landsat 4), June 20, 2000 (Landsat 7), and August 26, 2001 (Landsat 7) to analyze boreal forest near the Siberian city of Krasnoyarsk using the normalized difference vegetation index (NDVI), enhanced vegetation index (EVI), and reduced simple ratio (RSR). The temporally invariant cluster (TIC) centers were identified via a point density map of collocated pixel VIs from the base image and the target image, and a normalization regression line was created to intersect all TIC centers. Target image VI values were then recalculated using the regression function so that these two images could be compared using the resulting common radiometric scale. We found that EVI was very indicative of vegetation structure because of its sensitivity to shadowing effects and could thus be used to separate conifer forests from deciduous forests and grass/crop lands. Conversely, because NDVI reduced the radiometric influence of shadow, it did not allow for distinctions among these vegetation types. After normalization, correlations of NDVI and EVI with forest leaf area index (LAI) field measurements combined for 2000 and 2001 were significantly improved; the r2 values in these regressions rose from 0.49 to 0.69 and from 0.46 to 0.61, respectively. An EVI "cancellation effect" where FVI was positively related to understory greenness but negatively related to forest canopy coverage was evident across a post fire chronosequence with normalized data. These findings indicate that the TIC method provides a simple, effective and repeatable method to create radiometrically comparable data sets for remote detection of landscape change. Compared to some previous relative radiometric normalization methods, this new method does not require high level programming and statistical skills, yet remains sensitive to landscape changes occurring over seasonal and inter-annual time scales. In addition, the TIC method maintains sensitivity to subtle changes in vegetation phenology and enables normalization even when invariant features are rare. While this normalization method allowed detection of a range of land use, land cover, and phonological/biophysical changes in the Siberian boreal forest region studied here, it is necessary to further examine images representing a wide variety of ecoregions to thoroughly evaluate the TIC method against other normalization schemes. Numéro de notice : A2005-403 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2005.05.021 En ligne : https://doi.org/10.1016/j.rse.2005.05.021 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27539
in Remote sensing of environment > vol 98 n° 1 (30/09/2005) . - pp 63 - 79[article]Assesment of manual and automated methods for updating stand-level forest inventories based on aerial photography / Perttu Antilla (2005)
Titre : Assesment of manual and automated methods for updating stand-level forest inventories based on aerial photography Type de document : Thèse/HDR Auteurs : Perttu Antilla, Auteur ; Risto Päivinen, Directeur de thèse ; Matti Maltamo, Directeur de thèse Editeur : Vantaa [Finlande] : Finnish Society of Forest Science Année de publication : 2005 Collection : Dissertationes forestales, ISSN 1795-7389 num. 9 Importance : 42 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-951-651-108-8 Note générale : bibliographie
Academic Dissertation, Faculty of Forestry, University of Joensuu, FinlandLangues : Anglais (eng) Descripteur : [Termes IGN] actualité des données
[Termes IGN] appariement d'images
[Termes IGN] détection d'arbres
[Termes IGN] détection de changement
[Termes IGN] Finlande
[Termes IGN] forêt boréale
[Termes IGN] identification automatique
[Termes IGN] inventaire forestier (techniques et méthodes)
[Termes IGN] inventaire forestier étranger (données)
[Termes IGN] peuplement forestier
[Termes IGN] photo-identification
[Termes IGN] photogrammétrie aérienne
[Vedettes matières IGN] Inventaire forestierRésumé : (auteur) Data collection for forest planning in private forestry in Finland is based on periodic, labour-intensive, stand level field inventories. Therefore, to increase guidance for forest owners more cost-efficient methods that replace or supplement field inventories are needed so as to reallocate labour resources. In addition, for active forest owners, up-to-date information is of interest. The aim of this thesis was to test the applicability of different inventory and updating methods that are based on aerial photography for the regional forest inventory of private forests in Finland. Four approaches were chosen: I) stand level visual interpretation of changes and simulation of stand development, 2) automatic, stand level interpretation of aerial photographs utilising nonparametric estimation, 3) automatic, photogrammetric estimation of mean height, and 4) automatic, monoscopic identification of individual trees. Approaches I and 2 are inventory or updating methods, while approaches 3 and 4 can be considered as components of such methods. Approach 1 was found to be appropriate for operative use for estates that have not ordered a forest plan, provided that the strict prerequisites for the inventory area are met. The- accuracy of approach 2, as such, was not considered to be high enough for forest planning, but this very inexpensive method could turn out to be applicable, if its accuracy could be improved. Approach 3 was based on image matching and would be most useful as a part of other methods, like template matching in multiple images. Although only identification of trees was tested in approach 4, the applicability of whole single tree based inventory method was appraised. Relatively high costs and low accuracy limit the possibilities to use this method, in practice. Note de contenu : Introduction
1 - Material
2 - Methods
3 - Results
4 - DiscussionNuméro de notice : 21692 Affiliation des auteurs : non IGN Thématique : FORET Nature : Thèse étrangère Note de thèse : Academic Dissertation : Forestry : University of Joensuu : 2005 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90928 LIDAR-based geometric reconstruction of boreal type forest stands at single tree level for forest and wildland fire management / F. Morsdorf in Remote sensing of environment, vol 92 n° 3 (30 August 2004)
[article]
Titre : LIDAR-based geometric reconstruction of boreal type forest stands at single tree level for forest and wildland fire management Type de document : Article/Communication Auteurs : F. Morsdorf, Auteur ; E. Meier, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 353 - 362 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] forêt boréale
[Termes IGN] hauteur des arbres
[Termes IGN] houppier
[Termes IGN] incendie de forêt
[Termes IGN] lasergrammétrie
[Termes IGN] lutte contre l'incendie
[Termes IGN] reconstruction 3D
[Termes IGN] risque naturel
[Termes IGN] segmentation d'image
[Termes IGN] télémétrie laser aéroportéRésumé : (Auteur) Vegetation structure is an important parameter in fire risk assessment and fire behavior modeling. We present a new approach deriving the structure of the upper canopy by segmenting single trees from small footprint LIDAR data and deducing their geometric properties. The accuracy LIDAR data is evaluated using six geometric reference targets, with the standard deviation of the LIDAR returns on the target being as low as 0.06 m. The segmentation is carried out by using cluster analysis on the LIDAR raw data in all three coordinate dimensions. From the segmented clusters, tree position, tree height, and crown diameter are derived and compared with field measurements. A robust linear regression of 917 tree height measurements yields a slope of 0.96 with an offset of 1 m and the adjusted R 2 resulting at 0.92. However, crown diameter is not well matched by the field measurements, with R2 being as low as 0.2, which is most certainly due to random errors in the field measurements. Finally, a geometric reconstruction of the forest scene using a paraboloid model is carried out using values of tree positsion, tree height, crown diameter, and crown base height.
Copyright ElsevierNuméro de notice : A2004-384 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2004.05.013 En ligne : https://doi.org/10.1016/j.rse.2004.05.013 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26911
in Remote sensing of environment > vol 92 n° 3 (30 August 2004) . - pp 353 - 362[article]Remote sensing in BOREAS [BOReal Ecosystem Atmosphere Study]: Lessons learned / John A. Gamon in Remote sensing of environment, vol 89 n° 2 (30/01/2004)
[article]
Titre : Remote sensing in BOREAS [BOReal Ecosystem Atmosphere Study]: Lessons learned Type de document : Article/Communication Auteurs : John A. Gamon, Auteur ; K.F. Huemmrich, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 139 - 162 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse diachronique
[Termes IGN] bilan du carbone
[Termes IGN] biométrie
[Termes IGN] biosphère
[Termes IGN] carte d'occupation du sol
[Termes IGN] classification
[Termes IGN] climat froid
[Termes IGN] flore locale
[Termes IGN] forêt boréale
[Termes IGN] milieu naturel
[Termes IGN] mode d'occupation du sol
[Termes IGN] zone boréaleRésumé : (Auteur) The Boreal Ecosystem Atmosphere Study (BOREAS) was a large, multiyear internationally supported study designed to improve our understanding of the boreal forest biome and its interactions with the atmosphere, biosphere, and the carbon cycle in the face of global climate change. In the initial phase of this study (early 1990s), remote sensing played a key role by providing products needed for planning and modeling. During and after the main BOREAS field campaigns (1994 and 1996), innovative remote sensing approaches and analyses expanded our understanding of the boreal forest in four key areas: (1) definition of vegetation structure, (2) landcover classification, (3) assessment of the carbon balance, and (4) links between surface properties, weather, and climate. In addition to six BOREAS special issues and over 500 journal papers, a principal legacy of BOREAS is its well-documented and publicly available database, which provides a lasting scientific resource and opportunity to further advance our understanding of this critical northern biome. Numéro de notice : A2004-024 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2003.08.017 En ligne : https://doi.org/10.1016/j.rse.2003.08.017 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26552
in Remote sensing of environment > vol 89 n° 2 (30/01/2004) . - pp 139 - 162[article]Les milieux physiques continentaux / Yannick Lageat (2004)PermalinkMultitemporal repeat-pass SAR interferometry of boreal forests / J. Askne in IEEE Transactions on geoscience and remote sensing, vol 41 n° 7 (July 2003)PermalinkTélédétection de l'environnement dans l'espace francophone / F. Bonn (1994)PermalinkVégétation du continent européen / Paul Ozenda (1994)PermalinkTélédétection en Francophonie, Bilans régionaux et thématiques, Journées scientifiques / J.M. Dubois (1989)PermalinkIntermediate-scale vegetation mapping of Innoko national wildlife refuge, Alaska using Landsat MSS digital data / S.S. Talbot in Photogrammetric Engineering & Remote Sensing, PERS, vol 54 n° 3 (march 1988)PermalinkThematic Mapper and Spot integration with a geographic information system / D.G. Goodenough in Photogrammetric Engineering & Remote Sensing, PERS, vol 54 n° 2 (february 1988)PermalinkDirectional reflectance factor distributions for two forest canopies / J. Kleman in Remote sensing of environment, vol 23 n° 1 (01/10/1987)PermalinkPractical application of remote sensing in forestry / S. Sohlberg (1986)PermalinkRacing into tomorrow, 1985 ACSM ASPRS Fall convention / American society for photogrammetry and remote sensing (1985)PermalinkTélédétection et gestion des ressources / Hervé Guichard (1985)PermalinkPermalink