Viewpoint: Assessing the carbon sequestration potential of mesic savannas in the Northern Territory, Australia: approaches, uncertainties and potential impacts of fire

Functional Plant Biology : FPB
Richard J WilliamsXiayong Chen

Abstract

Tropical savannas cover a quarter of the Australian landmass and the biome represents a significant potential carbon sink. However, these savannas are subject to frequent and extensive fire. Fire regimes are likely to affect the productivity and carbon sequestration potential of savannas, through effects on both biomass and carbon emissions. The carbon sequestration potential has been estimated for some savanna sites by quantifying carbon storage in biomass and soil pools, and the fluxes to these pools. Using different techniques, previous work in these savannas has indicated that net ecosystem productivity [NEP, net primary productivity (NPP) less heterotrophic respiration] was about -3 t C ha-1 y-1 (i.e. a carbon sink). However, the impacts of fire were not accounted for in these calculations. Estimates of NEP have been combined with remotely-sensed estimates of area burnt and associated emissions for an extensive area of mesic savanna in Arnhem Land, NT, Australia. Combining NEP estimates with precise fire data provides an estimate of net biome productivity (NBP), a production index that includes carbon loss through disturbance (fire), and is thus a more realistic indicator of sequestration rate from this biome. This prelimi...Continue Reading

Citations

Jul 10, 2019·Global Change Biology·James R ProbertColin M Beale
Feb 8, 2013·Ecological Applications : a Publication of the Ecological Society of America·Shaun R LevickIzak P J Smit
Jan 27, 2012·Journal of Biogeography·David M J S BowmanRobert Whittaker
Aug 26, 2009·The New Phytologist·Ross A Bradstock, Richard J Williams
Jul 22, 2014·Global Change Biology·Jason BeringerPetteri Uotila
Jun 1, 2007·Ecology·Steven I HigginsWinston S W Trollope
Dec 1, 2004·Functional Plant Biology : FPB·Stephen H RoxburghMicahel L Roderick

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