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Accueil du site → Doctorat → États-Unis → 1996 → Effects of climatic and biotic interactions on plant life forms, reproductive characteristics and interspecific associations in southwestern American deserts

Brigham Young University (1996)

Effects of climatic and biotic interactions on plant life forms, reproductive characteristics and interspecific associations in southwestern American deserts

Abbadi, Ghanim A. S

Titre : Effects of climatic and biotic interactions on plant life forms, reproductive characteristics and interspecific associations in southwestern American deserts

Auteur : Abbadi, Ghanim A. S

Université de soutenance : Brigham Young University

Grade  : Doctor of Philosophy (PhD) 1996

Résumé
Southwestern desert vegetation and associated environments were studied at 55 locations in 4 states. Shrubs and annuals were the most speciose life forms in all deserts considered. Both groups increased with increasing annual mean temperature and potential evapotranspiration. Perennial grasses and broad-leaved herbs decreased strongly along the same gradients. Wind pollinated species increased and animal pollinated species decreased as annual temperature declined. Living plant cover and species richness per unit area declined as potential evapotranspiration and annual mean temperature increased. Annual species are rarely randomly distributed between shrub interspaces and shrub influenced microsites. Thirty-nine percent of the annual species preferred interspace locations, while 61% preferred to grow beneath a shrub. Each shrub species has a unique assemblage of associated annuals.

Mots clés : Ecology, Mojave Desert, Arizona, New Mexico, Biological sciences, Botany Sonoran Desert

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Page publiée le 11 mars 2015, mise à jour le 21 décembre 2019