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Titolo:
Edaphic factors and the landscape-scale distributions of tropical rain forest trees
Autore:
Clark, DB; Palmer, MW; Clark, DA;
Indirizzi:
Univ Missouri, Dept Biol, St Louis, MO 63121 USA Univ Missouri St Louis MO USA 63121 ri, Dept Biol, St Louis, MO 63121 USA Oklahoma State Univ, Dept Bot, Stillwater, OK 74078 USA Oklahoma State Univ Stillwater OK USA 74078 Bot, Stillwater, OK 74078 USA
Titolo Testata:
ECOLOGY
fascicolo: 8, volume: 80, anno: 1999,
pagine: 2662 - 2675
SICI:
0012-9658(199912)80:8<2662:EFATLD>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENVIRONMENT RELATIONSHIPS; SPECIES DISTRIBUTIONS; DIPTEROCARP FOREST; SOIL FERTILITY; PUERTO-RICO; COSTA-RICA; DIVERSITY; VEGETATION; COMMUNITY; GRADIENT;
Keywords:
Costa Rica; edaphic biases; edaphic gradients; landscape ecology; mesoscale landscape; randomized tests; topographic position effects; trees; tropical rain forest; tropical soils;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Clark, DB La Selva Biol Stn, INTERLINK 341,POB 02-5635, Miami, FL 33102 USA La Selva Biol Stn INTERLINK 341,POB 02-5635 Miami FL USA 33102 A
Citazione:
D.B. Clark et al., "Edaphic factors and the landscape-scale distributions of tropical rain forest trees", ECOLOGY, 80(8), 1999, pp. 2662-2675

Abstract

Tropical rain forests have the highest tree diversity on earth. Nonrandom spatial distributions of these species in relation to edaphic factors couldbe one mechanism responsible for maintaining this diversity. We examined the prevalence of nonrandom distributions of trees and palms in relation to soil type and topographic position ("edaphic biases") over a mesoscale (573ha) old-growth tropical rain forest (TRF) landscape at the La Selva Biological Station, Costa Rica. All trees and palms greater than or equal to 10 cm diameter were measured and identified in 1170 circular 0.01-ha plots centered on an existing 50 x 100 m grid. Topographic position was classified for each plot, and slope and aspect were measured. Soil type data were taken from a previous study (Clark et al. 1998). A total of 5127 trees and palms were identified in 267 species. Detrended Correspondence Analysis and Canonical Correspondence Analysis showed that highly significant edaphic gradients were present, with swamp or highly fertile soils separated from the lessfertile, well-drained upland soils. Species composition remained significantly related to topographic position when soil type was controlled for. Themain florist ic gradients were still significant when flooded sites were excluded from the analyses. Randomization tests on a weighted preference index were used to examine the relations of individual species to soil types arid, within the dominant soil type, to topographic position. Of the 132 species with N greater than or equal to 5 individuals, 33 showed significant associations with soil type. Within the dominant soil type, 13 of 110 analyzable species were nonrandomly associated with one or more topographic positions. For a variety of seasons, including issues relating to sample size and adequate edaphic characterization of landscapes, we suggest that the similar to 30% of species shown to be edaphically biased in this study is an underestimate of the true degree of edaphically related distributional biases. To evaluate this hypothesis will require mesoscale vegetation sampling combined with quantitative soil analyses at the same scale in a range of tropical rain forests. If edaphic distributional biases are shown to be common, thissuggests that edaphically linked processes leading to differential recruitment are similarly common.

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Documento generato il 16/01/21 alle ore 08:13:17