Oecologia

, Volume 80, Issue 3, pp 309–320 | Cite as

Recovery patterns of three chaparral shrub species after wildfire

  • C. M. Thomas
  • S. D. Davis
Original Papers

Summary

In a mature, even aged stand of mixed chaparral, Rhus laurina (facultative resprouter) had consistently higher water potentials and deeper roots than Ceanothus spinosus (facultative resprouter) and Ceanothus megacarpus (obligate seeder). For two years following a wildfire, the same stand of chaparral had resprouts with higher survivorships, predawn water potentials, stomatal conductances, photosynthetic rates and shoot elongation rates than seedlings. Supplemental irrigation of seedlings during summer months removed differences between resprouts and seedlings suggesting that the cause of such differences was limited water availability to the shoot tissues of seedlings. After two years of postfire regrowth, mean seedling survivorship for the obligate seeder (C. megacarpus) was 42%, whereas seedling survivorship for facultative resprouters was only 18% (C. spinosus) and 0.01% (R. laurina). Our results are consistent with the hypothesis that lack of resprouting ability among obligate seeders is offset by an enhanced ability to establish seedlings after wildfire, allowing obligate seeders to maintain themselves in mixed populations through many fire cycles.

Key words

Chaparral Seedling survival Root depth Rhus Ceanothus 

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References

  1. Axelrod DI (1989) Age and origin of chaparral. In: Keeley SC (ed) The California Chaparral: Paradigms Reexamined. Natural History Museum of LA County, Science Series 34:7–19Google Scholar
  2. Carpenter RL, Recher HF (1979) Pollination, reproduction, and fire. Am Nat 113:871–879CrossRefGoogle Scholar
  3. Chazdon RL, Field CB (1987) Photographic estimation of photosynthetically active radiation: evaluation of a computerized technique. Oecologia 73:525–532Google Scholar
  4. Christian KA, Tracy CR (1985) Measuring air temperature in field studies. J Therm Biol 10:55–56Google Scholar
  5. Davis SD (1989) Patterns in mixed chaparral stands: differential water status and seedling survival during summer drought. In: Keeley SC (ed) The California Chaparral: Paradigms Reexamined. Natural History Museum of LA County, Science Series 34: 97–105Google Scholar
  6. Davis SD, Mooney HA (1986) Water use patterns of four cooccurring chaparral shrubs. Oecologia 70:172–177Google Scholar
  7. Desouza J, Silka PA, Davis SD (1986) Comparative physiology of burned and unburned Rhus laurina after chaparral wildfire. Oecologia 71:63–68Google Scholar
  8. Frazer J, Davis SD (1988) Differential survival of chaparral seedlings during the first summer drought following wildfire. Oecologia 76:215–221Google Scholar
  9. Jacks PM (1984) The drought tolerance of Adenostoma fasiculatum and Ceanothus crassifolius seedlings and vegetation change in the San Gabriel Mountains. MS thesis. San Diego State Univ, CA, p 86Google Scholar
  10. Keeley JE (1977) Seed production, seed populations in soil, and seedling production after fire for two congeneric pairs of sprouting and nonsprouting chaparral shrubs. Ecology 58:820–829Google Scholar
  11. Keeley JE (1986) Resilience of mediterranean shrub communities to fire. pp 95–112. In: Dell B (ed) Resilience of Mediterranean Ecosystems. Dr W. Junk, New YorkGoogle Scholar
  12. Keeley JE, Keeley SC (1988) Chaparral. In: Barbour MG, Billings WD (eds) North American Terrestrial Vegetation. Cambridge University Press, Cambridge, pp 165–207Google Scholar
  13. Keeley JE, Zedler PH (1978) Reproduction of chaparral shrubs after fire: a comparison of sprouting and seedling strategies. Am Midl Nat 99:142–161Google Scholar
  14. Kummerow JD, Krause D, Jow W (1977) Root systems of chaparral shrubs. Oecologia 29:163–177Google Scholar
  15. Kummerow J, Ellis BA, Mills JN (1985) Post-fire seedling establishment of Adenostoma fasciculatum and Ceanothus greggii in southern California chaparral. Madrono 32:148–157Google Scholar
  16. Mahall BE, Schlesinger WH (1982) Effects of irradiance on growth, photosynthesis, and water use efficiency of seedlings of the chaparral shrub Ceanothus megacarpus. Oecologia 54:291–299Google Scholar
  17. Mills JN (1983) Herbivory and seedling establishment in post-fire southern California chaparral. Oecologia 60:267–270Google Scholar
  18. Munz PA (1974) A flora of southern California. Univ Calif Press, Berkeley, CA, p 1086Google Scholar
  19. Musick HB (1972) Post-fire seedling ecology of two Ceanothus species in relation to slope exposure. MA thesis, Univ Calif Santa Barbara, p 22Google Scholar
  20. Oechel WC, Hastings SJ (1983) The effects of fire on photosynthesis in chaparral resprouts. In: Druger FJ, Mitchell DT, Jarvis JUM (eds) Med-Type Ecosystems: The Role of Nutrients. Springer, New York, pp 274–285Google Scholar
  21. Plumb TR (1961) Sprouting of chaparral by December after a wildfire in July. US Forest Serv, Pacific Southwest Forest and Range Exp Sta Tec Paper 57, p 12Google Scholar
  22. Radosevich SR, Conard SG (1980) Physiological control of chamise shoot growth after fire. Am J Bot 67:1442–1447Google Scholar
  23. Raven PH (1977) The California Flora. In: Barbour MG, Major J (eds) Terrestrial Vegetation of California. John Wiley and Sons, New York, pp 109–137Google Scholar
  24. Sampson AW (1944) Plant succession on burned chaparral lands in Northern California. Univ Calif Agric Stn Bull No 685, p 144Google Scholar
  25. Schlesinger WH, Gray JT, Gill DS, Mahall BE (1982) Ceanothus megacarpus chaparral: a synthesis of ecosystem processes during development and annual growth. Bot Rev 48:47–117Google Scholar
  26. Scholander PF, Hammel HT, Bradstreet ED, Hemmingsen EA (1965) Sap pressure in vascular plants. Science 148:339–346Google Scholar
  27. Sokal RR, Rohlf FJ (1981) Biometry. WH Freeman & Co, San Francisco, p 859Google Scholar
  28. Weibe HH, Brown RW (1979) Temperature gradient effects on in situ hygrometer measurements of soil water. Agron J 71:397–401Google Scholar
  29. Weibe HH, Brown RW, Barker J (1977) Temperature gradient effects on in situ hygrometer measurements of water potential. Agron J 69:933–939Google Scholar
  30. Wells PV (1969) The relation between mode of reproduction and extent of speciation in woody genera of the California chaparral. Evol 23:264–267Google Scholar
  31. Zedler PH, Gautier CR, McMaster GS (1983) Vegetation change in response to extreme events: the effect of a short interval between fires in California chaparral and coastal scrub. Ecology 64:809–818Google Scholar

Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • C. M. Thomas
    • 1
  • S. D. Davis
    • 1
  1. 1.Natural Science DivisionPepperdine UniversityMalibuUSA

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