The estimation of carbon budgets of frequently burnt tree stands in savannas of northern Australia, using allometric analysis and isotopic discrimination

The estimation of carbon budgets of frequently burnt tree stands in savannas of northern Australia, using allometric analysis and isotopic discrimination

Title
Publication TypeJournal Article
Year of Publication2005
AuthorsCook, GD, Liedloff, AC, Eager, RW, Chen, X, Williams, RJ, O'Grady, AP, Assoc Prof Hutley, LB
JournalAustralian Journal of Botany
Volume53
Issue7
Pagination621 - 630
Date Published01/01/05
ISSN0067-1924
Keywordsatmospheric co2, biomass, delta-c-13, fire, kakadu national-park, management, patterns, rainfall gradient, tropical savanna, water-use efficiency
Abstract

The stock, rates of sequestration and allocation of carbon were estimated for trees in 14 0.1-ha plots at Kapalga in Kakadu National Park, Northern Territory, using new allometric relationships of carbon stock to stem cross-sectional area and measured growth rates of trees. Carbon stocks of trees ranged from 12 to 58 t ha(-1), with sequestration representing similar to 9% of the total stocks. More than half of the sequestered carbon is allocated to leaves and twigs and similar to 20% to wood. Only similar to 25% is retained in the live trees with leaf and twig fall accounting for 80 - 84% of the total transfers to the environment. An alternative method of calculating sequestration rates from consideration of water use and carbon-isotope discrimination data had a close to 1 : 1 match with estimates from allometric relationships. We developed and applied algorithms to predict the impacts of. re on carbon stocks of live trees. This showed that the reduction in live carbon stocks caused by single fires increased with increasing intensity, but the impact was highly dependent on the tree stand structure.

URLhttp://espace.cdu.edu.au/view/cdu:1806

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