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- Johansson, Maria UlrikaSveriges lantbruksuniversitet,Stockholms universitet,Institutionen för ekologi, miljö och botanik,Swedish University of Agricultural Sciences, Sweden,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,Stockholm University (författare)
Fire and grazing controlling a tropical tree line : Effects of long-term grazing exclusion in Bale Mountains, Ethiopia
- Artikel/kapitelEngelska2020
Förlag, utgivningsår, omfång ...
- 2020-07-09
- Wiley,2020
- printrdacarrier
Nummerbeteckningar
- LIBRIS-ID:oai:DiVA.org:su-184246
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-184246URI
- https://doi.org/10.1111/jvs.12905DOI
- https://res.slu.se/id/publ/106992URI
Kompletterande språkuppgifter
- Språk:engelska
- Sammanfattning på:engelska
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Klassifikation
Anmärkningar
- Aims: Tropical tree lines are often associated with abrupt shifts in vegetation, soils and disturbance regimes, but the underlying mechanisms are poorly understood. We analysed the role of grazing, fuels and fire in maintaining a sharp tree line with flammable heathland above non-flammable forest.Location: Bale Mountains, Ethiopia.Methods: The study used grazing exclosures, repeated vegetation sampling, soil analyses and burning and sowing experiments along an altitudinal gradient with Hagenia abyssinica forest, Erica trimera forest and Erica heathland; all were heavily grazed, the Erica heathland also burnt on short rotation.Results: Contrary to expectation, livestock exclusion did not increase flammability in the forest, but instead resulted in a dense carpet of non-flammable herbs. In the heathland, livestock exclusion led to somewhat faster post-fire fuel recovery, but no major change in vegetation. Seeding of tree species resulted in some seedling establishment, but notably Hagenia grew poorly in the heathland, even when protected from livestock. A bioassay, as well as observations of outpost trees on atypical soil above the tree line, suggests that this poor growth is caused by the acidic soils, rather than harsh climate. Despite frequent fires, heathland soils had lower pH and higher organic matter content than forest soils. Below the tree line, tree seedling establishment was successful only in forest gaps, and if livestock was excluded. In both forest and heathland rapid vegetative regeneration in the ground flora after disturbance restricted major species shifts.Conclusions: These results suggest that the contrasting fire potential between heathland and forest, and thus the sharp tree line would be maintained, or possibly even accentuated, in the absence of livestock grazing, and that Hagenia colonization upwards into the heathland is restricted not only by fire and grazing, but also the acidic soils, which is a legacy of centuries of dominance by Erica.
Ämnesord och genrebeteckningar
- NATURVETENSKAP Biologi hsv//swe
- NATURAL SCIENCES Biological Sciences hsv//eng
- LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske hsv//swe
- AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries hsv//eng
- LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Skogsvetenskap hsv//swe
- AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Forest Science hsv//eng
- Erica arborea
- Erica trimera
- Ericaceous soils
- forest regeneration
- Hagenia abyssinica
- heathlands
- livestock grazing
- pastoral fire
- post-fire succession
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Granström, AndersSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management(Swepub:slu)50879 (författare)
- Stockholms universitetInstitutionen för ekologi, miljö och botanik (creator_code:org_t)
- Sveriges lantbruksuniversitet
Sammanhörande titlar
- Ingår i:Journal of Vegetation Science: Wiley31:5, s. 841-8531100-92331654-1103
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