Rhizo-Stolons in Eucalyptus

1980 ◽  
Vol 28 (3) ◽  
pp. 299 ◽  
Author(s):  
AN Gillison ◽  
CJ Lacey ◽  
RH Bennett
Keyword(s):  
Field Observations ◽  
South Eastern ◽  
Eucalypt Species ◽  
Eastern Australia ◽  
South Eastern Australia

A previously unrecorded system of eucalypt regeneration, via stolons and rhizo-stolons, is reported for field populations of shrub-like forms of grey box (Eucalyptus moluccana Roxb. subsp. moluccana) in south- eastern Australia. Field collections of rooted stoloniferous material were transplanted into artificial media under controlled glasshouse conditions where they produced similar rhizomes and extensive plagiotropic branching. Similar field observations in E. stellulata populations suggest that this clonal phenomenon may be present in other eucalypt species and could have significant implications for research and management.

Buoyancy of Avicennia marina Propagules in South-Eastern Australia

1991 ◽  
Vol 39 (1) ◽  
pp. 77 ◽  
Author(s):  
PJ Clarke ◽  
PJ Myerscough
Keyword(s):  
Avicennia Marina ◽  
Field Observations ◽  
Tidal Inundation ◽  
South Eastern ◽  
Parent Tree ◽  
Eastern Australia ◽  
South Eastern Australia

Buoyancy of propagules of Avicennia marina (Forsk.) Vierh. was observed in the laboratory and in the field. Under constant exposure to seawater in the laboratory, propagules that shed their pericarp sank while those that retained their pericarp floated. The time taken for propagules to shed their pericarps varied greatly between trees in a population and between populations. However, more propagules lost their pericarps and sank faster in 10% seawater than in full seawater. Propagules that had sunk in 10% seawater refloated after several days' immersion. In the field, propagules placed at three tidal levels and exposed to differing periods of tidal inundation all lost their pericarps and sank within 24 h with no differences detected between tidal levels. Field observations were also made where brackish and seawater sites could be compared. Propagules shed their pericarps faster and sank earlier at the brackish site, although after 24 h more than 80% of propagules had sunk at all sites. After 48 h propagules in the brackish site began to refloat. These observations suggest that most A. marina. propagules strand and establish near the parent tree populations and only a few are dispersed more widely.

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