Résultat de la recherche
3 recherche sur le mot-clé
'valeur indicatrice d'Ellenberg' 




Do Ellenberg?s indicator values apply to the vascular plants colonizing decaying logs in mountain forests ? / Damian Chmura in Flora, vol. 234 (Année 2017)
[article]
Titre : Do Ellenberg?s indicator values apply to the vascular plants colonizing decaying logs in mountain forests ? Type de document : texte imprimé Auteurs : Damian Chmura, Auteur ; Jan Zarnowiec, Auteur ; Monika Staniaszek-Kik, Auteur Année de publication : 2017 Article en page(s) : pp. 15-23 Langues : Anglais (eng) Catégories : [habitats/milieux] 4 - Forêts
[Thèmes] Flore vasculaire (phanérogames et cryptogames vasculaires)
[Thèmes] MontagneMots-clés : valeur indicatrice d'Ellenberg étalonnage Résumé : "We investigated the applicability of Ellenbergs indicator values (EIVs) on coarse woody debris (CWD). Given that a small number of vascular plant species forms the pool of potential colonizers, we wanted to examine whether the properties of decaying logs and site characteristics can be predicted using EIVs. A comparison was made between the EIVs of the flora inhabiting mineral soil and plants colonizing 364 decaying logs of Picea abies and Fagus sylvatica in the Karkonosze Mts., southern Poland. We used correlation tests to assess the relationships between the mean and weighted EIVs and the decomposition stage of a decaying log, light conditions and moisture as well as the altitude at which the dead logs were lying. There were no significant differences in the mean EIVs between the species growing on mineral soil and CWD, except for the soil reaction, which was higher on the spruce logs. The plants colonizing decaying downed trees reflect the climatic conditions and altitude, i.e. elevation index, approximated heat load and vegetational gradient better than the edaphic conditions, i.e. the properties of dead wood such as its decomposition and moisture. We concluded that, in spite of the fact that in terms of biotopes fallen trees can be treated as synusia in forest communities, bioindication using the EIVs is not only possible but also predictable. Species that are present on CWD thus should be included in assessments of forest habitat conditions." (source : auteur) Type de publication : périodique Référence biblio : Chmura D., Zarnowiec J., Staniaszek-Kik M., 2017 - Do Ellenberg?s indicator values apply to the vascular plants colonizing decaying logs in mountain forests ? Flora, 234 : 15-23. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66245
in Flora > vol. 234 (Année 2017) . - pp. 15-23[article]Exemplaires(0)
Disponibilité aucun exemplaire Resurveying hedgerows in Northern Germany : Plant community shifts over the past 50 years / Kathrin Litza in Biological conservation, vol. 206 (Février 2017)
[article]
Titre : Resurveying hedgerows in Northern Germany : Plant community shifts over the past 50 years Type de document : texte imprimé Auteurs : Kathrin Litza, Auteur ; Martin Diekmann, Auteur Année de publication : 2017 Article en page(s) : pp. 226-235 Langues : Anglais (eng) Catégories : [ZG] Allemagne Use for events before 1949 and after October 1990.
[habitats/milieux] 84 - Alignements d'arbres, haies, petits bois, bocage, parcsMots-clés : haie acidification valeur indicatrice d'Ellenberg eutrophisation suivi à long terme Résumé : "Resurveying is a powerful approach to investigate responses of plant species communities to a changing environment. We present a resurvey of hedgerows from the “Knick” landscape of eastern Schleswig-Holstein, Germany. The original survey was done by H. E. Weber in 1967 and new data from totally 51 semi-permanent plots was sampled in 2015. Hedgerows are a key near-natural habitat that can harbour a great biodiversity in otherwise agriculturally intensified landscapes.
Our study reveals a distinct shift in the herbaceous species composition of the hedgerows over the past five decades. To understand the reasons for these changes, we compared the mean Ellenberg indicator values (EIVs) and measured pH values, as well as hedge shape parameters of the hedgerows between the recent and the original study. The main driver behind the change in species composition appeared to be the increase in nutrient supply. The hedge shape changed as well, indicating an altered hedgerow management. Interestingly, we found a contradictory relationship between measured pH values and mean EIVs for reaction: while the former showed a decrease over time, the latter suggested an increase.
Species richness decreased in some groups (shrubs and herbaceous forest species) but increased in others (grass species and arable weed species), with an overall decline in species richness. An analysis of the species' changes in frequency in relation to their EIVs showed that species with higher nitrogen and temperature scores were more likely to have increased." (source : auteur)Type de publication : périodique Référence biblio : Litza K., Diekmann M., 2017 - Resurveying hedgerows in Northern Germany : Plant community shifts over the past 50 years. Biological conservation, 206 : 226-235. ID PMB : 65420 DOI : 10.1016/j.biocon.2016.11.031/10.1016/j.biocon.2016.11.031 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65420
in Biological conservation > vol. 206 (Février 2017) . - pp. 226-235[article]Exemplaires(0)
Disponibilité aucun exemplaire Un bocage remarquable, témoin inestimable d'un parcellaire aujourd'hui largement disparu / Isabelle Paillusson in Penn ar bed, n°223-224 (Année 2016)
[article]
Titre : Un bocage remarquable, témoin inestimable d'un parcellaire aujourd'hui largement disparu Type de document : texte imprimé Auteurs : Isabelle Paillusson, Auteur ; Marie-Claire Bouvier, Collaborateur ; Nathalie Buckvald (....-2018), Collaborateur ; Elyan Cohin, Collaborateur ; Amélie Gardelle, Collaborateur ; Estelle Gouraud, Collaborateur ; Jean-Pierre Gouret, Collaborateur ; Gwénola Kervingant, Collaborateur ; Nicole Maillard, Collaborateur ; Corentin Paillusson, Collaborateur ; Melaine Roullaud, Collaborateur ; Jean-Pierre Roullaud, Collaborateur ; Daniel Chicouène, Auteur Année de publication : 2016 Article en page(s) : pp. 9-20 Langues : Français (fre) Catégories : [ZG] LOIRE-ATLANTIQUE (44)
[Espèces (in biblio)] Quercus pyrenaica
[habitats/milieux] 84.4 - BOCAGESMots-clés : Zone à défendre (ZAD) sol oligosaturé valeur indicatrice d'Ellenberg facteur abiotique Notre-Dame-des-Landes (Loire-Atlantique) Résumé : "L'effet mise en réserve de la ZAD depuis la fin des années 1960 a permis de préserver le bocage avec un parcellaire peu agrandi, des haies sur talus possédant des espèces floristiques caractéristiques de l'oligotrophie des landes (sol très pauvre en nutriments) et le chêne tauzin, espèce en limite nord de répartition." (source : auteurs) Type de publication : périodique Référence biblio : Paillusson I., Chicouène D., 2016 - Un bocage remarquable, témoin inestimable d'un parcellaire aujourd'hui largement disparu. Penn ar bed, NS Notre-Dame-des-Landes : 9-20. ID PMB : 63565 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=63565
in Penn ar bed > n°223-224 (Année 2016) . - pp. 9-20[article]Exemplaires(1)
Cote Localisation Disponibilité P0182-1 Brest Exclu du prêt