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Titolo:
Natural recovery and restoration potential of severely disturbed talus vegetation at Niagara Falls: Assessment using a reference system
Autore:
de Gruchy, MA; Matthes, U; Gerrath, JA; Larson, DW;
Indirizzi:
Univ Guelph, Dept Bot, Cliff Ecol Res Grp, Guelph, ON N1G 2W1, Canada UnivGuelph Guelph ON Canada N1G 2W1 Res Grp, Guelph, ON N1G 2W1, Canada
Titolo Testata:
RESTORATION ECOLOGY
fascicolo: 3, volume: 9, anno: 2001,
pagine: 311 - 325
SICI:
1061-2971(200109)9:3<311:NRARPO>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
CLIFF COMMUNITY; NEED; ESCARPMENT;
Keywords:
Niagara Escarpment; Niagara Falls; riparian vegetation; disturbance; talus slope; ice scour; alien species; restoration; cluster analysis; ordination;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Matthes, U Univ Guelph, Dept Bot, Cliff Ecol Res Grp, Guelph, ON N1G 2W1, Canada Univ Guelph Guelph ON Canada N1G 2W1 uelph, ON N1G 2W1, Canada
Citazione:
M.A. de Gruchy et al., "Natural recovery and restoration potential of severely disturbed talus vegetation at Niagara Falls: Assessment using a reference system", RESTOR ECOL, 9(3), 2001, pp. 311-325

Abstract

The talus slope adjacent to the Niagara River at Niagara Falls (Ontario, Canada) has been severely disturbed over the course of the past century as the area has been increasingly developed for tourism. In addition the lower talus slope is disturbed by periodic ice scour, most recently one year prior to this study. Historical evidence suggests that the original vegetation was similar to that currently found on talus slopes of the Niagara Escarpment, which could, therefore, be used as a reference system and restoration target. The current community structure and physical environment were sampled in 75 randomly placed 1-x-1-m quadrats. A total of 137 species were found, of which 62% were aliens. ANOVA showed that species richness, woody debris cover, litter cover, soil depth, and photosynthetically active radiation changed along a gradient perpendicular to the river. Three different sections of the study area whose last severe disturbance dated back 100, 30, and 4 years, respectively, were similar in their physical environment but were significantly different in species richness. Ordinations of species frequencies showed that light levels and distance from the river were the principal gradients controlling the vegetation structure. The species composition of the section last disturbed 100 years ago was different from that of the more recently disturbed sections. Ordination and cluster analysis of the pooled data showed large differences between the Niagara Falls site and reference escarpment talus slopes. Natural escarpment vegetation was much more homogeneous and had more species and fewer aliens. By comparing reference talus with sections of the study area at Niagara Falls that were last disturbed at different times, we conclude that the trajectory of natural successionat Niagara Falls is leading to an alternative state, an urban forest dominated by aliens, and that active restoration will be required to return the talus to its original state.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/01/20 alle ore 19:21:28