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Landscape metrics for characterization of forest landscapes in a sustainable management framework: Potential application and prevention of misuse / Emilio R. Diaz-Varela in Annals of Forest Science, Vol 66 n° 3 (April - May 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 3 (April - May 2009) . - n° 301 Titre : Landscape metrics for characterization of forest landscapes in a sustainable management framework: Potential application and prevention of misuse Titre original : Indices quantitatifs de paysage pour une caractérisation des paysages forestiers dans le cadre d'une gestion durable: application potentielle et prévention de mauvaise utilisation Type de document : Article/Communication Auteurs : Emilio R. Diaz-Varela, Auteur ; Manuel F. Marey-Pérez, Auteur ; Antonio Rigueiro-Rodriguez, Auteur ; Pedro Álvarez-Álvarez, Auteur Année de publication : 2009 Article en page(s) : n° 301 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] forêt [Termes IGN] gestion durable [Termes IGN] indicateur paysager [Termes IGN] modèle mathématique [Termes IGN] statistique mathématique [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) The use of landscape indices in the analysis of forest landscapes offers great potential for integration of spatial pattern information in management processes, but requires understanding of the limitations and correct interpretation of results. In this sense, awareness of scale effects on landscape indices is essential, especially when the data available is restricted to low-resolution maps. In this study, developed within the framework of the FORSEE project, the objective was to define accurately the potential usefulness of applying landscape indices to low-resolution maps commonly used in forestry studies. Landscape indices were applied to two maps differing in spatial resolution, and subsets were defined for three spatial extensions. Correlation analysis and comparison of the results were carried out to enable identification of the most suitable indices for use with low resolution data. The analysis enabled identification of the least scale-dependent indices, which are thus more useful for extrapolating results from low-resolution data. In general terms, diversity and edge indices provided the best results. We conclude that some (but not all) of the landscape indices can be used to analyse low-resolution maps with acceptable results. Additional advice is made to prevent misuse of the application of landscape indices. Numéro de notice : A2009-704 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest/2009004 Date de publication en ligne : 10/03/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/03/f07184/f07184.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72056 [article]

Preliminary study on the assessment of deadwood volume by the French national forest inventory / Rémi Teissier du Cros in Annals of Forest Science, Vol 66 n° 3 (April - May 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 3 (April - May 2009) . - n° 302 Titre : Preliminary study on the assessment of deadwood volume by the French national forest inventory Titre original : Étude préliminaire de l'évaluation du volume de bois mort à l'Inventaire forestier national français Type de document : Article/Communication Auteurs : Rémi Teissier du Cros, Auteur ; Sandra Lopez, Auteur Année de publication : 2009 Article en page(s) : n° 302 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] bois mort [Termes IGN] échantillonnage (statistique) [Termes IGN] étude préliminaire [Termes IGN] Inventaire Forestier National (organisme France) [Termes IGN] placette d'échantillonnage [Vedettes matières IGN] Inventaire forestier Résumé : (auteur) As the French national forest inventory does not currently monitor the lying compartment of the forest deadwood, the figures obtained on this topic are therefore partial. This study provides cost estimates and guidelines for assessing stumps, and standing and lying deadwood. Comparisons were made between a fixed-area sampling method and a line-intersect one. LIS was judged more time-efficient, especially in dense understorey. Computer simulations were performed in order to estimate the gain in precision with increasing transect lengths. The results showed a continuous improvement in precision associated with increases in transect length. The longest transect tested (50 m) still had a large coefficient of variation, suggesting that improvement in precision at the plot level could still be gained with longer transects. Therefore, from a practical standpoint in terms of fieldwork, we suggest that on a national scale lying deadwood should be measured by line-intersect sampling, whereas stumps, standing dead trees and snags can be monitored using standard fixed-area plots. To meet needs at the national level, we consider that local imprecision could be compensated for by the large number of plots measured each year. Numéro de notice : A2009-705 Affiliation des auteurs : IFN (1958-2011) Thématique : FORET Nature : Article DOI : 10.1051/forest/2009007 Date de publication en ligne : 07/04/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/03/f07196/f07196.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72057 [article]

Potential indicators of soil quality in temperate forest ecosystems: a case study in the Basque Country / Nahia Gartzia-Bengoetxea in Annals of Forest Science, Vol 66 n° 3 (April - May 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 3 (April - May 2009) . - n° 303 Titre : Potential indicators of soil quality in temperate forest ecosystems: a case study in the Basque Country Titre original : Indicateurs potentiels de la qualité des sols dans les écosystèmes forestiers tempérés : une étude de cas dans le Pays Basque Type de document : Article/Communication Auteurs : Nahia Gartzia-Bengoetxea, Auteur ; Nahia Gartzia-Bengoetxea, Auteur ; Ander González-Arias, Auteur ; Ellen Kandeler, Auteur ; Inazio Martínez de Arano, Auteur Année de publication : 2009 Article en page(s) : n° 303 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] adaptation (biologie) [Termes IGN] débardage [Termes IGN] écosystème forestier [Termes IGN] indicateur de biodiversité [Termes IGN] Pays basque (Espagne) [Termes IGN] qualité du sol [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Assessment of forest sustainability requires reliable soil quality indicators. The present study evaluated the use of several potential such indicators in forests in the Basque Country under different types of management, involving: (i) species change and (ii) heavily mechanised forest operations. Five adjacent forest stands were selected for study: (i) two unmanaged forests (Quercus robur, Fagus sylvatica) and one (40-year-old) Pinus radiata plantation, to investigate the effect of species change; and (ii) a chronosequence of mechanised radiata pine plantations (3 and 16 years old), to investigate heavy mechanisation. Several physical, chemical and biological parameters were analysed in the mineral soil. Species change could not be assessed with chemical parameters, but parameters related to organic matter indicated the disturbance caused by heavy mechanisation. The Least Limiting Water Range was a good indicator of soil physical degradation induced by heavy mechanisation. Biological parameters proved sensitive indicators: (i) the fungal phospholipid fatty acid biomarker 18:2ω6 for species change; and (ii) the ratio of Gram-positive/Gram-negative bacteria for heavy mechanisation. Nevertheless, these parameters are complementary, and monitoring programmes should include physical, chemical and biological parameters. Further studies are required to assess natural boundaries of variation in soil quality indicators, and their resistance and resilience. Numéro de notice : A2009-706 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1051/forest/2009008 Date de publication en ligne : 07/04/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/03/f08073/f08073.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72058 [article]

Effects of some ecological variables on carabid communities in native and non native forests in the Ibaizabal basin (Basque Country: Spain) / Adoración Martínez in Annals of Forest Science, Vol 66 n° 3 (April - May 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 3 (April - May 2009) . - n° 304 Titre : Effects of some ecological variables on carabid communities in native and non native forests in the Ibaizabal basin (Basque Country: Spain) Titre original : Effets de certaines variables écologiques sur les communautés de carabidés autochtones et non autochtones des forêts dans le bassin Ibaizabal au Pays Basque espagnol Type de document : Article/Communication Auteurs : Adoración Martínez, Auteur ; Juan Carlos Iturrondobeitia, Auteur ; Arturo Goldarazena, Auteur Année de publication : 2009 Article en page(s) : n° 304 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] biodiversité [Termes IGN] Coleoptera (ordre) [Termes IGN] écologie forestière [Termes IGN] Espagne [Termes IGN] gestion forestière [Termes IGN] habitat forestier [Termes IGN] Pays basque (Espagne) [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Carabid beetles were investigated at five different forest types in the Ibaizabal basin (northern Spain). The landscape is characterized by the presence of remnants of native forest surrounded by conifer plantations. Carabids were trapped in 52 stands of mixed forest, beech forest, holm oak forest, mixed pine and Monterey pine plantations in 2005 and 2006. The main objectives of the study were: compare carabid diversity, recognise the characteristic species, and study the effects of ecological variables on carabid assemblages in the different forest types. No significative differences in species abundance, richness and diversity were found among the studied forests. Most of the trapped beetles were identified as forest generalists, nevertheless some native and non-native forest specialist species were also found. Distribution of carabid communities overlapped and, except for beech forest, no specific communities were distinguished. Altitude, percentage of grass coverage and temperature were the main variables influencing species distribution. The results suggest high habitat homogeneity, caused by regeneration in pine plantations of the indigenous understorey, and by poor habitat quality in native forest (patchy remnants enclosed in conifer plantations). This situation could explain the similar carabid diversity. Numéro de notice : A2009-707 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1051/forest/2009003 Date de publication en ligne : 10/03/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/03/f08106/f08106.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72059 [article]

Potential use of pine plantations to restore native forests in a highly fragmented river basin / Miren Onaindia in Annals of Forest Science, Vol 66 n° 3 (April - May 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 3 (April - May 2009) . - n° 305 Titre : Potential use of pine plantations to restore native forests in a highly fragmented river basin Titre original : Usage possible des plantations de pins pour restaurer les forêts naturelles dans un bassin hydrographique très fragmenté Type de document : Article/Communication Auteurs : Miren Onaindia, Auteur ; Anaïs Mitxelena, Auteur Année de publication : 2009 Article en page(s) : n° 305 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] afforestation [Termes IGN] bassin hydrographique [Termes IGN] biodiversité [Termes IGN] boisement artificiel [Termes IGN] chênaie [Termes IGN] Fagus sylvatica [Termes IGN] gestion forestière durable [Termes IGN] hêtraie [Termes IGN] paysage [Termes IGN] Pinus radiata [Termes IGN] Quercus (genre) [Termes IGN] régénération (sylviculture) [Vedettes matières IGN] Sylviculture Résumé : (auteur) In forests, the substitution of broadleaf species by conifers can reduce biodiversity because coniferous forests generally provide less diverse vascular understories than broadleaf forests. However, in some cases, former pine plantations might be useful for restoring native forests. We compared plant species composition on the plot scale in natural beech and mixed oak forests with that in plantations of Pinus radiata. Links between plant diversity and landscape parameters (patch size, fractal dimension and distance to the nearest patch of the same type) were investigated. The objective of this study was to evaluate the use of pine plantations for restoring native diversity in a zone where native forests are very fragmented. Similar to oak forests, plant diversity in pine plantations was high, mainly due to the presence of generalist species. Some species characteristic of oak forests also appeared in pine plantations, suggesting the onset of natural forest regeneration. These results suggest that pine plantations could be used to promote natural regeneration of original oak forests. Moreover, residual native stands should be conserved as important sources of native species and their seeds. Numéro de notice : A2009-708 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1051/forest/2009002 Date de publication en ligne : 10/03/2009 En ligne : https://doi.org/10.1051/forest/2009002 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72060 [article]

Using cover measurements to estimate aboveground understorey biomass in Maritime pine stands / Annabel J. Porté in Annals of Forest Science, Vol 66 n° 3 (April - May 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 3 (April - May 2009) . - n° 307 Titre : Using cover measurements to estimate aboveground understorey biomass in Maritime pine stands Titre original : Estimation de la biomasse aérienne du sous-bois de peuplements de pin maritime à l'aide de mesures de recouvrement Type de document : Article/Communication Auteurs : Annabel J. Porté, Auteur ; Jean-Charles Samalens, Auteur ; Raphaël Dulhoste, Auteur ; Rémi Teissier du Cros, Auteur ; Alexandre Bosc, Auteur ; Céline Meredieu, Auteur Année de publication : 2009 Article en page(s) : n° 307 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] biomasse forestière [Termes IGN] mise à l'échelle [Termes IGN] modèle de croissance végétale [Termes IGN] Pinus pinaster [Termes IGN] sous-bois Résumé : (auteur) Understorey plays a major role in forest fluxes and stocks balances, however this compartment is generally poorly quantified. Our objectives were to establish models to estimate understorey biomass using vegetation cover measurements and to investigate upscaling methodologies from stand to regional level. Understorey aboveground biomass measurements were undertaken in Maritime pine stands of mesohygric, mesic and dry moorlands in South West France. Average biomass stock in this compartment was estimated to 3.50 t DM ha-1. The more abundant species groups varied with moorland types, with a higher relative contribution of herbaceous species (23.3%), bracken (59.2%) and mosses (31.6%) for mesohygric, mesic and dry moorlands, respectively. For each species group, we established significant relationships to estimate biomass using a volumetric index, based on cover and height measurements. No relationship between stand characteristics and understorey biomass was founded. We investigated the upscaling of these estimations to a several thousands hectare area using understorey cover measurements done along a regular spatial grid. The only significant correlation linked one satellite vegetation index to understorey biomass. We successfully developed empirical relationships to estimate the understorey biomass at the stand level. Further investigations could focus on the analysis of understorey variability over a finer space grid and the potential use of satellite vegetation indexes. Numéro de notice : A2009-710 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1051/forest/2009005 Date de publication en ligne : 10/03/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/03/f08135/f08135.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72062 [article]

Towards standardised crown condition assessment in poplar plantations / Jorge Martín-García in Annals of Forest Science, Vol 66 n° 3 (April - May 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 3 (April - May 2009) . - n° 308 Titre : Towards standardised crown condition assessment in poplar plantations Titre original : Améliorations en vue d'un suivi standardisé de l'état sanitaire des houppiers en plantations monoclonales de peuplier Type de document : Article/Communication Auteurs : Jorge Martín-García, Auteur ; Julio Javier Diez, Auteur ; Hervé Jactel, Auteur Année de publication : 2009 Article en page(s) : n° 308 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] houppier [Termes IGN] indicateur biologique [Termes IGN] Populus (genre) [Termes IGN] santé des forêts Résumé : (auteur) This work aims at developing new tools for rapid assessment of forest health indicators in poplar plantations. Crown transparency and discoloration were visually evaluated in all trees of four 15 m-radius sub-plots in 32 poplar clonal plantations, which were chosen according to a factorial scheme with three factors: tree age, site quality and understorey vegetation management. A subset of trees was assessed using digital photos processed with a semi-automatic image analysis system (the CROCO software) in order to compare visual and digital crown transparency estimates. Poplar crown conditions were better in young stands and rich sites. Harrowing understorey vegetation improved tree health in poor sites. Samples of 20 trees per stand provided the same information about crown transparency and discoloration as 60 trees. Calibration curves of digital crown transparency estimates were successfully fitted against visual crown transparency estimates. The same effects of stand age and site quality could be detected with digital crown transparency as response variable. The use of digital photos processed with CROCO in ca. twenty trees per stand is therefore recommended to accurately and objectively monitor crown condition in clonal poplar plantations. Numéro de notice : A2009-711 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest/2009006 Date de publication en ligne : 10/03/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/03/f08144/f08144.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72063 [article]