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Titolo:
Experimental manipulations of fertile islands and nurse plant effects in the Mojave Desert, USA
Autore:
Walker, LR; Thompson, DB; Landau, FH;
Indirizzi:
Univ Nevada, Dept Biol Sci, Las Vegas, NV 89154 USA Univ Nevada Las VegasNV USA 89154 Dept Biol Sci, Las Vegas, NV 89154 USA
Titolo Testata:
WESTERN NORTH AMERICAN NATURALIST
fascicolo: 1, volume: 61, anno: 2001,
pagine: 25 - 35
SICI:
1527-0904(200101)61:1<25:EMOFIA>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTHERN NEVADA; COLEOGYNE COMMUNITIES; ARTEMISIA-TRIDENTATA; CHIHUAHUAN DESERT; LARREA-TRIDENTATA; SONORAN DESERT; COMPETITION; SHRUBS; ECOSYSTEM; PATTERNS;
Keywords:
competition; facilitation; aridland soils; Ambrosia dumosa; Coleogyne ramosissima; Larrea tridentata;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Walker, LR Univ Nevada, Dept Biol Sci, Box 454004, Las Vegas, NV 89154 USAUniv Nevada Box 454004 Las Vegas NV USA 89154 gas, NV 89154 USA
Citazione:
L.R. Walker et al., "Experimental manipulations of fertile islands and nurse plant effects in the Mojave Desert, USA", WEST N AM N, 61(1), 2001, pp. 25-35

Abstract

In a mixed desert shrub community we removed and added shrub canopies to examine above- and belowground influences of 3 species of shrubs on islands of soil fertility and the survival of transplanted Ambrosia dumosa seedlings. Soils sampled under shrubs in the wet season had higher pH, water content, organic matter, and both total and mineralizable nitrogen than soils in adjacent open areas, confirming a widely established pattern in arid lands. However, we also found species differences in soil parameters. Soils underColeogyne ramosissima had highest pH, soils under A. dumosa had highest water content and nitrogen mineralization rates, and soils under Larrea tridentata had lowest water content. Soils sampled under shrubs in the dry season, 7 months after experimental shrub removal, maintained higher organic matter and total and mineralizable nitrogen content than adjacent open soils, but pH and water were altered by shrub manipulations. Species differences persisted only in soil water levels (A. dumosa soils were driest). Over a 1-year period, transplanted A. dumosa seedlings had highest survivorship in shrub removal and open treatments and died most rapidly under control shrubsof all 3 species, suggesting that shrubs had a strong negative effect on seedling survival, even in the presence of higher organic matter, nutrients,and (initially) higher water content of fertile islands. Our results suggest that nurse plants and islands of soil fertility have the potential to facilitate growth of other species by nutrient additions, but that the net effect of nurse plants can be negative due to shading and/or root competition.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 08:30:16