Dead leaves and fire survival in Southern African tree aloes

Summary

Many aloe species in southern Africa have stems clothed with a layer of persistent dead leaves. The degree of stem coverage is species-specific. The suggestion that persistent dead leaves have an insulatory function and are adaptive in fire-prone habitat was tested on Aloe ferox. Field surveys demonstrated a significant negative relationship between mortality and degree of stem coverage and laboratory studies confirmed the insulating properties of dead leaves. The distribution of southern African tree aloes supprts the prediction that bare-stemmed species would be confined to fire-free habitat whilst fully clothed species would occur in both fire-prone and fire-free habitat. The study suggests that harvesting of Aloe ferox leaves for medicinal purposes could result in significant mortality in fires.

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References

  1. Acocks JPH (1953) Veld Types of South Africa. Mem Bot Surv S Afr 28:128 pp

  2. Coates Palgrave K (1977) Trees of Southern Africa. Struik, Cape Town

    Google Scholar 

  3. Eames AJ, MacDaniels LH (1947) An introduction to Plant Anatomy. McGraw-Hill, New York 2nd ed

    Google Scholar 

  4. Gill AM (1975) Fire and the Australian Flora: A review. Aust For 38:4–25

    Google Scholar 

  5. Gill AM (1981 a) Adaptive responses of Australian vascular plant species to fires. In: Gill AM, Groves RH, Noble IR (eds) Fire and the Australian Biota. Australian Academy of Sciences, Canberra, pp 243–272

    Google Scholar 

  6. Gill AM (1981 b) Coping with Fire. In: Pate JS, McComb AJ (eds) The Biology of Australian Plants, Univ of W Aust Press, pp 65–87

  7. Gill AM, Ashton DH (1968) The role of bark type in relative tolerance to fire of three central Victorian eucalypts. Aust J Bot 16:491–498

    Google Scholar 

  8. Hare RC (1965) Contribution of bark to fire resistance of southern trees. J For 63:248–251

    Google Scholar 

  9. Jeppe B (1969) South African Aloes. Purnell, Cape Town. pp 150

    Google Scholar 

  10. Kayll AJ (1966) Some characteristics of heath fires in north-east Scotland. J Appl Ecol 3:29–40

    Google Scholar 

  11. Marloth R (1915) The flora of South Africa: Vol IV Monocotyledones. Wesley, London p 95

    Google Scholar 

  12. Martin RE (1963) A basic approach to fire injury of tree stems. In: Proc Tall Timbers Fire Ecology Conference 2:151–162

  13. Moll E (1981) Trees of Natal. Eco-Lab, University of Cape Town. pp 572

  14. Noble IR, Slatyer RO (1977) Post-fire successon of plants in Mediterranean Ecosystems. In: Mooney HA, Conrad CE (eds), Proc of the Symposium on the Environmental Consequences of Fire and Fuel Management in Mediterranean Ecosystems, USDA Forest Service General Technical Report WO-3, pp 27–36

  15. Reynolds GW (1950) The Aloes of South Africa. Aloes of South Africa Book Fund

  16. Trabaud L (1979) Etude du comportement du feu dans la garrigue de Chêne kermès à partir des températires et des vitesses de propagation. Ann Sci Forest 36:13–38

    Google Scholar 

  17. Trollope WSW (1978) Fire behaviour: a preliminary study. Proc Grassld Soc Sth Afr 13:123–128

    Google Scholar 

  18. Tunstall BR, Walker J, Gill AM (1976) Temperature distribution around synthetic trees during grass fires. For Sci 22:269–276

    Google Scholar 

  19. Vareschi V (1962) La quema como factor ecologico en los llanos. Bol Soc Venezol Cienc Nat 23:9–26

    Google Scholar 

  20. Vines RG (1968) Heat transfer through bark, and the resistance of trees to fire. Aust J Bot 16:499–514

    Google Scholar 

  21. West O (1974) Field guide to the Aloes of Rhodesia. Longmans

  22. Whittaker E (1961) Temperature in heath fires. J Ecol 49:709–715

    Google Scholar 

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Bond, W. Dead leaves and fire survival in Southern African tree aloes. Oecologia 58, 110–114 (1983). https://doi.org/10.1007/BF00384549

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Keywords

  • Negative Relationship
  • Laboratory Study
  • Field Survey
  • Insulatory Function
  • Significant Mortality