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Titolo:
Experiments on the mechanism of tree and shrub establishment in temperate grassy woodlands: Seedling emergence
Autore:
Clarke, PJ; Davison, EA;
Indirizzi:
Univ New England, Armidale, NSW 2351, Australia Univ New England ArmidaleNSW Australia 2351 rmidale, NSW 2351, Australia
Titolo Testata:
AUSTRAL ECOLOGY
fascicolo: 4, volume: 26, anno: 2001,
pagine: 400 - 412
SICI:
1442-9985(200108)26:4<400:EOTMOT>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
EUCALYPTUS-SALMONOPHLOIA; REMNANT WOODLANDS; RECRUITMENT; GROWTH; GERMINATION; PREDATION; AUSTRALIA;
Keywords:
eucalypt woodlands; fire; grazing; myrmecochory; recruitment; savanna; spatial variation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Clarke, PJ Univ New England, Armidale, NSW 2351, Australia Univ New England Armidale NSW Australia 2351 W 2351, Australia
Citazione:
P.J. Clarke e E.A. Davison, "Experiments on the mechanism of tree and shrub establishment in temperate grassy woodlands: Seedling emergence", AUSTRAL EC, 26(4), 2001, pp. 400-412

Abstract

Field experiments were designed to examine tree and shrub seedling emergence in temperate grassy woodlands on the New England Tablelands. The effectsof study sites, intensity of previous grazing, removal of ground cover by fire or clearing, burial of seeds and ant seed theft on seedling emergence were tested in two field experiments. Six tree and seven shrub species wereused in the experiments and their cumulative emergence was compared with laboratory germination studies. All species used in field experiments had lower cumulative emergence than those in laboratory germination studies despite prolonged periods of above average rainfall before and after seeds were sown. Eucalypt species emerged faster in the field than the shrub species and generally attained higher cumulative emergence than the shrubs. Spatial effects of sites and patches within sites, and of previous grazing history did not strongly influence patterns of seedling emergence in most species. Ground and litter cover generally did not enhance or suppress the emergenceof seedlings, although the removal of cover in recently grazed areas enhanced the emergence of some species. Burning enhanced the emergence of some tree and shrub species where plots had more fuel and intense fires, but thiseffect was not strong. Compared with other treatments, seedbed manipulations produced the strongest effects. In the absence of both invertebrate and vertebrate predators, seedling emergence was lower for surface-sown seed, compared with seed sown on scarified soil surfaces. Higher seedling emergence of buried seeds in the presence of invertebrate predators probably resulted from the combined effects of predator escape and enhanced moisture status of the germination environment. Some promotion of emergence was achieved for all species in most sown treatments probably as a result of a prolongedabove average rainfall. In contrast, the natural recruitment of trees and shrubs was negligible in experimental plots, highlighting the importance ofseed supply and dispersal as ultimate determinants of recruitment.

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Documento generato il 08/04/20 alle ore 23:57:11