Long-term fire resilience of the Ericaceous Belt, Bale Mountains, Ethiopia

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Graciela Gil-Romera - , Aberystwyth University, Spanish National Research Council, University of Marburg (Author)
  • Carole Adolf - , University of Oxford (Author)
  • Blas M. Benito - , University of Bergen (Author)
  • Lucas Bittner - , Martin Luther University Halle-Wittenberg (Author)
  • Maria U. Johansson - , Stockholm University (Author)
  • David A. Grady - , Aberystwyth University (Author)
  • Henry F. Lamb - , Aberystwyth University (Author)
  • Bruk Lemma - , Martin Luther University Halle-Wittenberg (Author)
  • Mekbib Fekadu - , University of Marburg, Addis Ababa University (Author)
  • Bruno Glaser - , Martin Luther University Halle-Wittenberg (Author)
  • Betelhem Mekonnen - , Martin Luther University Halle-Wittenberg (Author)
  • Miguel Sevilla-Callejo - , Spanish National Research Council, University of Zaragoza (Author)
  • Michael Zech - , Institute of Geography, Martin Luther University Halle-Wittenberg (Author)
  • Wolfgang Zech - , University of Bayreuth (Author)
  • Georg Miehe - , University of Marburg (Author)

Abstract

Fire is the most frequent disturbance in the Ericaceous Belt (ca 3000- 4300 m.a.s.l.), one of the most important plant communities of tropical African mountains. Through resprouting after fire, Erica establishes a positive fire feedback under certain burning regimes. However, present-day human activity in the Bale Mountains of Ethiopia includes fire and grazing systems that may have a negative impact on the resilience of the ericaceous ecosystem. Current knowledge of Erica-fire relationships is based on studies of modern vegetation, lacking a longer time perspective that can shed light on baseline conditions for the fire feedback. We hypothesize that fire has influenced Erica communities in the Bale Mountains at millennial timescales. To test this, we (1) identify the fire history of the Bale Mountains through a pollen and charcoal record from Garba Guracha, a lake at 3950 m.a.s.l., and (2) describe the long-term bidirectional feedback between wildfire and Erica, which may control the ecosystem's resilience. Our results support fire occurrence in the area since ca 14 000 years ago, with particularly intense burning during the early Holocene, 10.8-6.0 cal ka BP. We show that a positive feedback between Erica abundance and fire occurrence was in operation throughout the Lateglacial and Holocene, and interpret the Ericaceous Belt of the Ethiopian mountains as a long-term fire resilient ecosystem. We propose that controlled burning should be an integral part of landscape management in the Bale Mountains National Park.

Details

Original languageEnglish
Article number20190357
JournalBiology letters
Volume15
Issue number7
Publication statusPublished - 2019
Peer-reviewedYes

External IDs

PubMed 31337290

Keywords

Keywords

  • Africa, Charcoal, Erica, Fire trap, Flammability, Palaeoecology