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Titolo:
Can isotropy vs. anisotropy in the spatial association of plant species reveal physical vs. biotic facilitation?
Autore:
Haase, P;
Titolo Testata:
JOURNAL OF VEGETATION SCIENCE
fascicolo: 1, volume: 12, anno: 2001,
pagine: 127 - 136
SICI:
1100-9233(200102)12:1<127:CIVAIT>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHRUB RETAMA-SPHAEROCARPA; SEMIARID ENVIRONMENT; NURSE PLANT; POSITIVE INTERACTIONS; LEGUMINOUS SHRUB; SONORAN DESERT; PHOTOSYNTHETIC RATE; SOUTHEASTERN SPAIN; PATTERN-ANALYSIS; QUERCUS-HUMILIS;
Keywords:
aggregated pattern; bivariate pattern; clustered pattern; competition; facilitation; K-statistics; L-statistics; nurse-plant effect; Ripley's K-function; second-order spatial analysis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
66
Recensione:
Indirizzi per estratti:
Indirizzo: Haase, P Dyckerhoffstr 3, D-49525 Lengerich, Germany Dyckerhoffstr 3 Lengerich Germany D-49525 25 Lengerich, Germany
Citazione:
P. Haase, "Can isotropy vs. anisotropy in the spatial association of plant species reveal physical vs. biotic facilitation?", J VEG SCI, 12(1), 2001, pp. 127-136

Abstract

In dryland ecosystems and other harsh environments, a large part of the vegetation is often clustered, appearing as 'islands'. If 'independent' species, usually colonizers, can be distinguished from species which are 'dependent' on the presence of the colonizing species for successful establishmentand/or persistence, the type of spatial pattern of the association - isotropic (spatially symmetric) or anisotropic (spatially asymmetric)- can give information on the underlying environmental factors driving the process of association. Modified spatial pattern analysis based on Ripley's K-functioncan be applied to bivariate clustered patterns by cardinal direction in order to detect possible anisotropy in the pattern of association. The methodwas applied to mapped distribution patterns of two types of semi-arid shrubland in southeastern Spain. In shrubland of Retama sphaerocarpa, low shrubs of Artemisia barrelieri were significantly clustered under the canopy of the Retama shrubs in all four cardinal directions, suggesting an isotropic facilitation effect. In low shrubland dominated by Anthyllis cytisoides andArtemisia barrelieri, Anthyllis shrubs occurred more frequently than expected on the eastern side (and downslope) of Artemisia shrub. The possible environmental factors driving the two association patterns are discussed and recommendations for further applications of the analytical method are given.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/06/20 alle ore 22:13:23