Veiko Lehsten
Researcher
Climate-fire interactions and Savanna ecosystems : A dynamic vegetation modeling study for the African Continent
Author
Summary, in English
Savannas are inherently “disturbed” ecosystems, but the regularly recurring disruptions play such a fundamental ecological role (Scholes and Archer, 1997) that “episodic events” rather than “disturbance” may the more apt terminology. From an atmospheric perspective, fire is the most significant of these episodic events. Fires shape community species composition; tree to grass ratio and nutrient redistribution; and biosphere-atmosphere exchange of trace gases, aerosols, momentum, and energy. Savannas’ estimated mean NPP of 7.2 ± 2.0 t C ha-1 year-1 amounts to nearly two thirds of tropical forest NPP (Grace et al., 2006); but remarkably little is known about Savanna net carbon balance, especially for the African continent (Williams et al., 2007). In the absence of transient changes in the fire regime, such as could be introduced by climate change or fire-driven changes in land cover, Savanna fires do not affect average annual net carbon uptake much, as the carbon released.
Department/s
- Dept of Physical Geography and Ecosystem Science
- MERGE: ModElling the Regional and Global Earth system
Publishing year
2010-01-01
Language
English
Pages
463-478
Publication/Series
Ecosystem Function in Savannas : Measurement and Modeling at Landscape to Global Scales
Document type
Book chapter
Publisher
CRC Press
Topic
- Physical Geography
Status
Published
ISBN/ISSN/Other
- ISBN: 9781439804704
- ISBN: 9781439804711