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Titolo:
Natural history and invasion of Russian olive along eastern Montana rivers
Autore:
Lesica, P; Miles, S;
Indirizzi:
Conservat Biol Res, Missoula, MT 59802 USA Conservat Biol Res Missoula MTUSA 59802 Biol Res, Missoula, MT 59802 USA
Titolo Testata:
WESTERN NORTH AMERICAN NATURALIST
fascicolo: 1, volume: 61, anno: 2001,
pagine: 1 - 10
SICI:
1527-0904(200101)61:1<1:NHAIOR>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
MISSOURI RIVER; RIPARIAN; ESTABLISHMENT; PLAINS; RECRUITMENT; FLOODPLAIN; WILDLIFE; FORESTS;
Keywords:
Russian olive; Elaeagnus augustifolia; exotic; cottonwood; riparian habitat; Montana; beaver;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Lesica, P Conservat Biol Res, 929 Locust, Missoula, MT 59802 USA ConservatBiol Res 929 Locust Missoula MT USA 59802 MT 59802 USA
Citazione:
P. Lesica e S. Miles, "Natural history and invasion of Russian olive along eastern Montana rivers", WEST N AM N, 61(1), 2001, pp. 1-10

Abstract

Russian olive (Elaeagnus angustifolia) is an exotic tree considered invasive in the western U.S. There is concern it will replate native riparian forests, resulting in a loss of biological diversity. We studied the dynamics of Russian olive invasion on the Marias River in north central Montana and the lower Yellowstone River in southeastern Montana to determine where and in what habitats it occurs, how it is interacting with plains cottonwood (Populus deltoides) and green ash (Fraxinus pennsylvanica), the dominant native riparian trees, and how these interactions will alter future riparian forests. We measured size, density and age of Russian olive, cottonwood, and green ash as well as vegetative composition and overstory canopy cover in sample plots in alluvial bar and terrace habitats at randomly chosen sites. Russian olive occurred in multiple-age stands on terraces along both rivers but was rarely found establishing in recently flood-deposited alluvium. Diameter growth rates decreased with increasing overstory canopy cover but did not vary significantly with soil moisture as reflected by ground-layer vegetation. Russian olive grew at nearly 3 times the rate of the native late-successional green ash at sites where both occurred together. Russian olive attained reproductive maturity at ca 10 years of age on both rivers, and,on average, there was less than 1 new plant recruited per mature tree per year. Beaver felled a high proportion of cottonwood within 50 m of both river channels, but Russian olive was little damaged. Russian olive will establish with increasing frequency in riparian forestsas well as wet meadows and along ditches and overflow channels in eastern Montana. Native riparian forests will be replaced by Russian olive as old cottonwoods die on upper terraces or are removed by beaver near active channels. Cottonwood establishment and dominance will not be precluded on riverswhere flooding regularly reinitiates primary succession beyond the zone ofbeaver activity However, Russian olive may preclude cottonwood recruitmentby shading seedlings along streams where flooding does not occur or merelydeposits alluvium on top of existing vegetation rather than creating new channels or broad point bars. Because of its long maturation time and low recruitment rate, Russian olive invasion in Montana will proceed slowly compared with many exotics.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 15:38:51