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Titolo:
BIOMECHANICS OF PLANT-GROWTH FORMS - THE TROUBLE WITH FOSSIL PLANTS
Autore:
ROWE NP; SPECK T;
Indirizzi:
UNIV MONTPELLIER 2,INST SCI EVOLUT,UMR 5554 CNRS,LAB PALEOBOT,PL E BATAILLON,CP062 F-34095 MONTPELLIER 05 FRANCE ALBERT LUDWIGS UNIV,BOT GARTEN D-79104 FREIBURG GERMANY
Titolo Testata:
Review of palaeobotany and palynology
fascicolo: 1-2, volume: 102, anno: 1998,
pagine: 43 - 62
SICI:
0034-6667(1998)102:1-2<43:BOPF-T>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
TREE; HABIT;
Keywords:
BIOMECHANICS; FOSSIL PLANTS; GROWTH FORMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
N.P. Rowe e T. Speck, "BIOMECHANICS OF PLANT-GROWTH FORMS - THE TROUBLE WITH FOSSIL PLANTS", Review of palaeobotany and palynology, 102(1-2), 1998, pp. 43-62

Abstract

Among living plants, a wide range of growth forms from herbs to shrubs and large-bodied trees and Lianas can be characterized by identifying different mechanical signals based on changes of structural Young's modulus (E-str) and flexural stiffness (EI) during ontogeny. Over recent years this 'ontogenetic approach' has been adopted to infer growth forms of fossil plants by treating the fossil stems and their tissues as composite materials and using appropriate centrisymmetric models tocalculate values of EI and E-str. One of the main difficulties facingmechanical reconstructions of fossil plants and a confident assessment of growth form, result from disarticulated stem parts. Two approaches of viewing mechanical data from both living and fossil plants include: (1) observing mechanical data based on different ontogenetic stagesas 'general data', independently of relative position on the plant body (applicable to both living plants and especially isolated fossil stem parts); (2) viewing the mechanical data as 'positional data' where relative positioning of stem parts and their mechanical parameters maybe observed (rare in fossil plants). A comparison of general and positional data sets among extant plants indicates that both are informative for large-bodied growth forms including self-supporting trees and non-self-supporting lianas that show appreciable changes in stem diameter during ontogeny. Among the small-bodied plants tested such as Lycopodiella cernua, an informative mechanical signal was generated only from the positional data set. The conclusion reached in extending this approach to fossil plants is that large-bodied fossil plants showing a wide range of stem diameter-based ontogenetic stages during growth maygenerate an informative pattern from isolated fragments but small-bodied plants may require interconnected positional data for an unequivocal mechanical growth form signal. (C) 1998 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 09:35:52