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Accueil du site → Doctorat → Australie → Phenological responses of select Eucalyptus species to environmental variability

University of Melbourne (2014)

Phenological responses of select Eucalyptus species to environmental variability

Rawal, Deepa Shree

Titre : Phenological responses of select Eucalyptus species to environmental variability

Auteur : Rawal, Deepa Shree

Université de soutenance : University of Melbourne

Grade : Doctor of Philosophy (PhD) 2014

Présentation
The Earth’s climate is warming which will likely lead to changes in biological systems ; particularly to species physiology, phenology and distribution. Phenology is the study of life cycle events of plants and animals (e.g.plant germination/ leafing/ flowering ; bird migration/feeding) that is directly ruled by seasonal changes in climate. The phenological responses of species are typically sensitive to climate and can be drivers of plant distributions. In Australia, significant research gaps exist on species phenology as extensive and long-term datasets are lacking. A lack of datasets and observational studies highlights key knowledge gaps on the relationship between climate and species phenology, which in turn may limit our ability to predict the response of species to climatic change.
This study investigates the key environmental drivers that affect three phenological cycles ; germination, growth and reproduction (flowering) of six Eucalyptus species that co-occur in two groups, representing dry (warm-dry) and wet (cool-moist) sclerophyll forests of south-eastern Australia respectively. The six species studied were E. microcarpa, E. polyanthemos, E. tricarpa, E. obliqua, E. radiata and E.sieberi ; the first three species representing the dry and the later three the wet sclerophyll forests. The study seeks to identify the relationships between these phenological events and the environmental factors temperature, soil moisture, air humidity and photoperiod length. In particular, the study seeks to identify environmental thresholds that initiate or delay phenological events. Experimental and statistical approaches were used to identify phenological response parameters for each phenological stage.

Mots Clés : Eucalypt ; germination ; growth ; flowering ; climate response ; establishment ; modelling ; recruitment

Présentation

Page publiée le 16 octobre 2016, mise à jour le 3 juillet 2017