• Dans le catalogue
• Dans les sources affiliées

  trié(s) par (Pertinence décroissant(e), Titre croissant(e)) 

Expert-based measures of human impact to vegetation / Jack Zinnen in Applied Vegetation Science, vol. 24, n°1 (Année 2020)

Public [article]  inApplied Vegetation Science > vol. 24, n°1 (Année 2020) . - e12523 Titre : Expert-based measures of human impact to vegetation Type de document : texte imprimé Auteurs : Jack Zinnen, Auteur ; Greg Spyreas, Auteur ; László Erdos, Auteur ; Christian Berg, Auteur ; Jeffrey W. Matthews, Auteur Année de publication : 2020 Article en page(s) : e12523 Langues : Anglais (eng) Catégories : [habitats/milieux] 3 - Landes, fruticées et prairies [ZG] Amérique du nord [ZG] Europe [Thèmes] Impact de l'homme sur l'environnement Mots-clés : anthropisation  indice d'anthropisation  flore  coefficient de conservation  indicateur d'Ellenberg  qualité floristique  indicateur Résumé : "Human impact has had a profound influence on modern vegetation. Expert-based vegetation indicator systems have been developed to measure and characterize human impacts on vegetation. Floristic Quality Assessment (FQA) is a widely used, primarily North American system for assessing degradation and natural quality through species-based values called coefficients of conservatism. The hemeroby and naturalness indicator value (NIV) systems were independently developed for users to assess human impacts in Europe. Despite the similarities among these indicator systems, there is no mutual recognition among them, and they have developed and operate in relative isolation from one another. We describe how FQA and naturalness indicator values, in particular, could be considered twin systems. Despite these core similarities, users of these systems do not cite each other, potentially overlooking benefits from applying methods and concepts from separate systems. The FQA, hemeroby, and NIV systems have unique weaknesses, strengths, and primary applications compared to other ecological indicator systems. We conclude by discussing the future role and utility of the three specialized human impact indicator systems for scientists and practitioners. Human impact indicator values may be valuable for use in basic research, but arguably their most important applications are in the practice of conservation, such as monitoring restored ecosystems." (source : auteurs) Type de publication : périodique Référence biblio : Zinnen J., Spyreas G., Erdos L., Berg C., Matthews J., 2020 - Expert-based measures of human impact to vegetation. Applied Vegetation Science, 24 (1) : e12523. ID PMB : 70633 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=70633 [article]

Exemplaires(0)

Disponibilité
aucun exemplaire

Stratified resampling of phytosociological databases : Some strategies for obtaining more representative data sets for classification studies / Ilona Knollová in Journal of Vegetation Science, vol. 16, n°4 (Année 2005)

Public [article]  inJournal of Vegetation Science > vol. 16, n°4 (Année 2005) . - pp. 479-486 Titre : Stratified resampling of phytosociological databases : Some strategies for obtaining more representative data sets for classification studies Type de document : texte imprimé Auteurs : Ilona Knollová, Auteur ; Milan Chytrý, Auteur ; Lubomír Tichý, Auteur ; Ondrej Hájek, Auteur Année de publication : 2005 Article en page(s) : pp. 479-486 Langues : Anglais (eng) Catégories : [Thèmes] SIG - Télédétection Mots-clés : indicateur d'Ellenberg  stratification géographique  stratification de l'habitat  donnée phytosociologique  communauté végétale  relevé phytosociologique  conception d'échantillonnage Résumé : "Random resampling of the initial data set and geographically stratified resampling resulted in similar classifications. By contrast, classifications of the resampled data sets that were based on habitat stratifications (2–5) differed from each other and from the initial data set. Stratification 2 resulted in classifications that strongly reflected environmental factors with a coarse grain of spatial heterogeneity (e.g. macroclimate), whereas stratification 5 resulted in classifications emphasizing fine-grained factors (e.g. soil nutrient status). Stratification 3 led to the most deviating results, possibly due to the subjective nature of the traditional phytosociological classifications." (source : auteurs) Type de publication : périodique Référence biblio : Knollová I., Chytrý M., Tichý L., Hájek O., 2005 - Stratified resampling of phytosociological databases : Some strategies for obtaining more representative data sets for classification studies. Journal of Vegetation Science, 16 (4) : 479-486. ID PMB : 71035 DOI : 10.1111/j.1654-1103.2005.tb02388.x Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71035 [article]

Exemplaires(0)

Disponibilité
aucun exemplaire