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Fire controls population structure in four dominant tree species in a tropical savanna

Lehmann, Caroline, Prior, Lynda Dorothy and Bowman, David M. J. S. (2009). Fire controls population structure in four dominant tree species in a tropical savanna. Oecologia,161(3):505-515.

Document type: Journal Article
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IRMA ID 78663947xPUB5
Title Fire controls population structure in four dominant tree species in a tropical savanna
Author Lehmann, Caroline
Prior, Lynda Dorothy
Bowman, David M. J. S.
Journal Name Oecologia
Publication Date 2009
Volume Number 161
Issue Number 3
ISSN 1432-1939   (check CDU catalogue open catalogue search in new window)
Start Page 505
End Page 515
Total Pages 11
Place of Publication Germany
Publisher Springer
HERDC Category C1 - Journal Article (DEST)
Abstract The persistence of mesic savannas has been theorised as being dependent on disturbances that restrict the number of juveniles growing through the sapling size class to become fire-tolerant trees. We analysed the population structures of four dominant tropical savanna tree species from 30 locations in Kakadu National Park (KNP), northern Australia. We found that across KNP as a whole, the population size structures of these species do not exhibit recruitment bottlenecks. However, individual stands had multimodal size-class distributions and mixtures of tree species consistent with episodic and individualistic recruitment of co-occurring tree species. Using information theory and multimodel inference, we examined the relative importance of fire frequency, stand basal area and elevation difference between a site and permanent water in explaining variations in the proportion of sapling to adult stems in four dominant tree species. This showed that the proportion of the tree population made up of saplings was negatively related to both fire frequencies and stand basal area. Overall, fire frequency has density-dependent effects in the regulation of the transition of saplings to trees in this Australian savanna, due to interactions with stem size, regeneration strategies, growth rates and tree–tree competition. Although stable at the regional scale, the spatiotemporal variability of fire can result in structural and floristic diversity of savanna tree populations.
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Created: Thu, 18 Mar 2010, 14:42:33 CST by Sarena Wegener