Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Brittleness of twig bases in the genus Salix: fracture mechanics and ecological relevance
Autore:
Beismann, H; Wilhelmi, H; Bailleres, H; Spatz, HC; Bogenrieder, A; Speck, T;
Indirizzi:
Univ Freiburg, Inst Biol Geobot 2, D-79104 Freiburg, Germany Univ Freiburg Freiburg Germany D-79104 obot 2, D-79104 Freiburg, Germany Harvard Univ, Cambridge, MA 02138 USA Harvard Univ Cambridge MA USA 02138Harvard Univ, Cambridge, MA 02138 USA CIRAD Foret, F-34032 Rennes, France CIRAD Foret Rennes France F-34032CIRAD Foret, F-34032 Rennes, France Univ Freiburg, Inst Biol 3, D-79104 Freiburg, Germany Univ Freiburg Freiburg Germany D-79104 Biol 3, D-79104 Freiburg, Germany
Titolo Testata:
JOURNAL OF EXPERIMENTAL BOTANY
fascicolo: 344, volume: 51, anno: 2000,
pagine: 617 - 633
SICI:
0022-0957(200003)51:344<617:BOTBIT>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
BIOMECHANICS; WOOD;
Keywords:
growth strains; scanning electron microscopy; elasticity; fracture; plant ecology;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Beismann, H Univ Basel, Inst Bot, Schoenbeinstr 6, CH-4056 Basel, Switzerland Univ Basel Schoenbeinstr 6 Basel Switzerland CH-4056 tzerland
Citazione:
H. Beismann et al., "Brittleness of twig bases in the genus Salix: fracture mechanics and ecological relevance", J EXP BOT, 51(344), 2000, pp. 617-633

Abstract

The twig bases within the genus Salix were investigated. Brittleness of twig bases as defined in the literature neither correlates with Young's modulus nor with growth strains, which were measured for S. alba, S. fragilis and S. x rubens, For the species S. alba, S. appendiculata, S. eleagnos, S. fragilis, S. purpurea, S. triandra, S. viminalis, and S. x rubens, fracture surfaces of broken twigs were investigated and semiquantitatively describedin terms of 'relative roughness' (ratio of rough area of fracture surface over whole area of fracture surface). The relative roughness clearly corresponds with the classification into brittle and nonbrittle species given in the literature. An attempt was made to quantify brittleness with mechanicaltests. The absolute values of stress and strain do not correlate with the brittleness of the twig bases as defined by the relative roughness. However, the 'index stress' (ratio of stress at yield over stress at fracture) or the 'index strain' (ratio of strain at yield over strain at fracture), correlate well with the relative roughness. The graphic analysis of index stress against index strain reveals a straight line on which the eight species are ordered according to their brittleness. Depending on growth form and habitat, brittle twig bases of willows may function ecologically as mechanicalsafety mechanisms and, additionally, as a propagation mechanism.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 10:25:08