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

Environmental biology of a tropical treeline species, Polylepis sericea / G. Goldstein

Public in Tropical alpine environments : plant form and function / Philip Rundel (1994) Titre : Environmental biology of a tropical treeline species, Polylepis sericea Type de document : texte imprimé Auteurs : G. Goldstein, Auteur ; F.C. Meinzer, Auteur ; F. Rada, Auteur Importance : pp. 129-149 Langues : Anglais (eng) Résumé : "It is likely that Polylepis (Rosaceae) occurs naturally at higher elevations than any other arborescent angiosperm genus in the world. The 15 species (Simpson 1979) are confined to the South American Andes where they occur primarily in tropical alpine environments. Some Polylepis species tend to form discrete forest stands reaching elevations over 5000 m, well above the upper continuous forest limit (timberline). Throughout their high altitude distribution most members of this genus are exposed to rigorous climatic conditions in which diurnal temperature variations by far exceed seasonal ones and night frosts are frequent. The genus is exclusively arborescent (trees or shrubs), with individuals ranging in height from 1 m to no more than 30 m. The trees tend to have twisted, crooked stems and branches, particularly in open, exposed habitats. The form and branching pattern of some individuals resembles those of krummholz trees found in temperate alpine regions. The bark is deep red in color and consists of several layers of thin, exfoliating sheets. Although the exfoliating bark is particularly thick at the base of the stem or large branches, the insulating effect is by no means comparable to that of the marcescent leaves that surround the stem of the adjacent giant rosette plants (Smith 1979; Goldstein & Meinzer 1983). The leaves are compound and alternate but often appear whorled owing to the compression of internodes at the branch tips. The leaflets are small, dark green above and are covered with dense, silvery trichomes on the underside in several species." (source : auteurs) Type de publication : article de livre Référence biblio : Goldstein G., Meinzer F.-C., Rada F., 1994 - Environmental biology of a tropical treeline species, Polylepis sericea. In : 1994 - Tropical alpine environments : plant form and function. Cambridge University Press, 129-149. ID PMB : 7614 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=7614

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Tropical alpine ecology : progress and priorities / F.C. Meinzer

Public in Tropical alpine environments : plant form and function / Philip Rundel (1994) Titre : Tropical alpine ecology : progress and priorities Type de document : texte imprimé Auteurs : F.C. Meinzer, Auteur ; Alan Smith, Auteur Importance : pp. 355-363 Langues : Anglais (eng) Catégories : [Thèmes] Ecologie Résumé : "As physiological plant ecologists and population biologists continue to work in tropical alpine environments, our knowledge of the form and functional relationships will surely grow rapidly. These ecosystems present unusual challenges for plant establishment and survival, but remain poorly studied. In this closing chapter, we briefly review what we feel are the important accomplishments to date in tropical alpine ecology and the challenges that remain. We focus on plant growth forms, plant demography, physiological convergence, ecosystem function and global climate change. Plant growth forms The most striking aspect of tropical alpine habitats is the diversity of plant growth forms, and the apparent convergence between geographically disjunct tropical mountains with respect to these forms (Hedberg & Hedberg 1979; Rauh 1978). Much progress has been made in understanding the ecological and physiological significance of the giant rosette form, perhaps the most conspicuous and typical form of high tropical mountains. However, the majority of tropical alpine growth forms have not been subject to quantitative and experimental analysis. Sclerophyllous-leaved shrubs, cushion plants, tussock grasses and acaulescent rosette forms have received minimal attention. Species in each of these forms may respond differently to changing environmental conditions, and may contribute in very different ways to edaphic, microclimatic and biotic environments. Classical ecological paradigms suggest the evolution will lead toward convergence in adaptive traits of morphology, phenology, and physiology which provide the ‘best’ ecological solution to similar environmental stresses in disjunct habitats." (source : auteurs) Type de publication : article de livre Référence biblio : Meinzer F.-C., Smith A., 1994 - Tropical alpine ecology : progress and priorities. In : 1994 - Tropical alpine environments : plant form and function. Cambridge University Press, 355-363. ID PMB : 7601 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=7601

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Tropical alpine environments : plant form and function / Philip Rundel (1994)

Public Titre : Tropical alpine environments : plant form and function Type de document : texte imprimé Auteurs : Philip Rundel, Directeur de publication ; Alan Smith, Directeur de publication ; F.C. Meinzer, Directeur de publication Editeur : Cambridge University Press Année de publication : 1994 Importance : 376 p. ISBN/ISSN/EAN : 978-0-511-55147-5 Langues : Anglais (eng) Type de publication : livre Référence biblio : Rundel P. & Smith A.-P. & Meinzer F.-C. (coord.), 1994 - Tropical alpine environments : plant form and function. Cambridge University Press, 376 p. ID PMB : 1345 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=1345

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Cote	Localisation	Disponibilité
R29000110	Brest	Exclu du prêt

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