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Titolo:
Size-structure dynamics of two conifers in relation to understorey dwarf bamboo: A simulation study
Autore:
Takahashi, K; Kohyama, T;
Indirizzi:
Hokkaido Univ, Grad Sch Environm Earth Sci, Sapporo, Hokkaido 0600810, Japan Hokkaido Univ Sapporo Hokkaido Japan 0600810 oro, Hokkaido 0600810, Japan
Titolo Testata:
JOURNAL OF VEGETATION SCIENCE
fascicolo: 6, volume: 10, anno: 1999,
pagine: 833 - 842
SICI:
1100-9233(199912)10:6<833:SDOTCI>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
OLD-GROWTH FOREST; SUB-BOREAL FOREST; SPECIES COEXISTENCE; SUBALPINE FORESTS; TREE COMPETITION; NORTHERN JAPAN; RAIN-FORESTS; REGENERATION; ABIES; DISTURBANCE;
Keywords:
Abies sachalinensis; co-existence; competition; coniferous forest; Picea glehnii; recruitment; Sasa;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Takahashi, K Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 0600819, Japan Hokkaido Univ Sapporo Hokkaido Japan 0600819 0600819, Japan
Citazione:
K. Takahashi e T. Kohyama, "Size-structure dynamics of two conifers in relation to understorey dwarf bamboo: A simulation study", J VEG SCI, 10(6), 1999, pp. 833-842

Abstract

Size-structure dynamics and co-existence of the conifers Abies sachalinensis and Picea glehnii in subalpine forests in Japan, in relation to the understorey dwarf bamboo Sasa, were examined using a simulation model. This model explicitly incorporated recruitment rate, size growth rate and mortality. Recruitment and growth rates were assumed to be suppressed by the cumulative basal area of taller trees and the density of Sasa. As for the one-sided crowding effect, two types of model were examined. The total basal area of the two species suppresses the growth and recruitment rates in an additive model, while the basal area of each species has a separate effect included in a specific model. Two types of recruitment process were examined, i.e.open and closed systems; recruitment rates of open and closed systems are independent of, and proportional to, the basal area of the same species within the plot, respectively. Parameters were estimated from data of plot censuses for four years. The parameters of the specific model showed that recruitment and size growth rates were more suppressed by the same species thanthe other species. Recruitment of A. sachalinensis was mon sensitive to suppression by Sasa compared with P. glehnii. The stationary size structure of the two species, generated from both the models with the open system, fitted well to the observed size structures across various Sasa densities. A. sachalinensis and P. glehnii dominated at lower and higher densities of Sasa, respectively. However, the closed-system simulation showed that the stable co-existence of the two species with a good fit to the observed size structure occurred only in the specific model. These results suggest that within-species interference, which is more severe than between-species interference, is important for the co-existence of the two species and that the relative dominance of the two species readily explained the differential responses to Sasa abundance.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 19:32:59