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Exposure-related forest-steppe: A diverse landscape type determined by topography and climate / Martin Hais in Journal of Arid Environments, vol 135 (December 2016)  

Public [article]  inJournal of Arid Environments > vol 135 (December 2016) . - pp 75 - 84 Titre : Exposure-related forest-steppe: A diverse landscape type determined by topography and climate Type de document : Article/Communication Auteurs : Martin Hais, Auteur ; Milan Chytrý, Auteur ; Michal Horsak, Auteur Année de publication : 2016 Article en page(s) : pp 75 - 84 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] climat continental [Termes IGN] hétérogénéité spatiale [Termes IGN] image Landsat [Termes IGN] modèle numérique de surface [Termes IGN] occupation du sol [Termes IGN] pente [Termes IGN] précipitation [Termes IGN] Sibérie [Termes IGN] steppe [Termes IGN] topographie locale [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Topographic heterogeneity under dry continental climate can create a landscape mosaic called “exposure-related forest-steppe”, characterized by a regular pattern of forest on the north- and steppe on the south-facing slopes. Here we identify the climatic and topographic determinants of this landscape type, using a model of the Altai Mountains in southern Siberia because they (1) contain large areas of forest-steppe together with forested and steppe landscapes, and (2) possess well-preserved natural land-cover. Based on the Landsat land-cover classification and digital elevation model we identified areas containing exposure-related forest-steppe and modeled their climatic and topographic thresholds using regression trees. The models showed that in the Altai exposure-related forest-steppe is most common in topographically heterogeneous areas with May–September precipitation of 226–377 mm and a mean July temperature of 13.8–15.6 °C. Its existence is jointly determined by hilly topography and a climate that is moist enough to support tree growth on north-facing slopes, but insufficiently so to support woodland development on south-facing slopes. This is consistent with the concept of effective topographic heterogeneity, suggesting that topographic heterogeneity on the landscape level is translated into high habitat diversity and species diversity only within a certain range of climatic conditions. Numéro de notice : A2016--158 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1016/j.jaridenv.2016.08.011 Date de publication en ligne : 31/08/2016 En ligne : https://doi.org/10.1016/j.jaridenv.2016.08.011 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86984 [article]

Alien species pool influences the level of habitat invasion in intercontinental exchange of alien plants / Veronica Kalusová in Global ecology and biogeography, vol 23 n° 12 (December 2014)  

Public [article]  inGlobal ecology and biogeography > vol 23 n° 12 (December 2014) . - pp 1366 - 1375 Titre : Alien species pool influences the level of habitat invasion in intercontinental exchange of alien plants Type de document : Article/Communication Auteurs : Veronica Kalusová, Auteur ; Milan Chytrý, Auteur ; Robert K. Peet, Auteur ; Thomas R. Wentworth, Auteur Année de publication : 2014 Article en page(s) : pp 1366 - 1375 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Caroline du Nord (Etats-Unis) [Termes IGN] Caroline du Sud (Etats-Unis) [Termes IGN] espèce exotique envahissante [Termes IGN] habitat d'espèce [Termes IGN] habitat forestier [Termes IGN] placette d'échantillonnage [Termes IGN] République Tchèque [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Aim : We hypothesize that the level of plant invasion at the scale of vegetation plots is affected by the different sizes of regional species pools of alien plants adapted to particular habitats. We test these species-pool effects in the context of alien species exchange between analogous habitats on two continents. Location : North and South Carolina, and the Czech Republic (both as native and invaded range). Methods : We identified native and alien vascular plant species within 6059 vegetation plots from 27 habitats of eastern North America and Central Europe. We compared the habitats’ level of invasion, expressed as the proportion of alien species in a representative sample of vegetation plots from each habitat, with the contribution of each habitat to the alien species pool, calculated as the proportion of species of this habitat that are native to one continent and donated as aliens to the other. Results : A habitat's level of invasion on one continent increases with the proportion of alien species donated to its regional species pools by analogous habitats on the other continent, i.e. the more of its native species a habitat contributes as aliens, the more of them establish in analogous recipient habitats (direct species-pool effect). The habitat's level of invasion on the same continent also increases with the proportion of native species that those habitats themselves donate to regional species pools on the other continent, i.e. a habitat that gives many aliens also receives many aliens (reciprocal species-pool effect). Main conclusions : We demonstrate that when a habitat on one continent donates more of its native species to the alien species pool, the analogous habitat on the recipient continent also contains a greater number of aliens. The same donor habitat is itself also the recipient of more alien species invading from the analogous habitats of other continents. Numéro de notice : A2014-791 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1111/geb.12209 En ligne : http://dx.doi.org/10.1111/geb.12209 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80342 [article]

Silver Jubilee of the journal and complexity of global change / Meelis Pärtel in Journal of vegetation science, vol 25 n° 1 (January 2014)    

Public [article]  inJournal of vegetation science > vol 25 n° 1 (January 2014) . - pp 1 - 3 Titre : Silver Jubilee of the journal and complexity of global change Type de document : Article/Communication Auteurs : Meelis Pärtel, Auteur ; Alessandro Chiarucci, Auteur ; Milan Chytrý, Auteur ; Valerio D. Pillar, Auteur Année de publication : 2014 Article en page(s) : pp 1 - 3 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Ecologie forestière [Termes IGN] phytosociologie Résumé : [introduction] The Journal of Vegetation Science is celebrating its Silver Jubilee this year! Since 1990, when the journal was founded by Eddy van der Maarel, Robert K. Peet and Robert Neuhäusl as the official publication of the International Association for Vegetation Science (IAVS), we have published 2556 papers on all topics of plant community ecology. Numéro de notice : A2014-797 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1111/jvs.12133 En ligne : https://doi.org/10.1111/jvs.12133 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81073 [article]

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