Plant Ecology

, Volume 170, Issue 1, pp 121–134 | Cite as

Effects of biological soil crusts on seed germination of four endangered herbs in a xeric Florida shrubland during drought

  • Christine V. Hawkes
Article

Abstract

Soil crusts of rosemary scrubs in south-central Florida were examined for effects on seed germination of four herbs that are killed by fire and must recruit from seed: Eryngium cuneifolium (Apiaceae), Hypericum cumulicola (Hypericaceae), Polygonella basiramia (Polygonaceae), and Paronychia chartacea ssp. chartacea (Caryophyllaceae). Biological soil crusts in these sites are dominated by algae, cyanobacteria, fungi, and bacteria. Because crusts can change soil stability, water, and nutrients, they can affect seed germination. A series of greenhouse and field experiments were designed to first examine the effects of crusts in isolation and then to determine their role in the context of other environmental factors – time since fire and distance to the dominant shrub in this system, Ceratiola ericoides. In the greenhouse experiment, germination in autoclaved crusts was dramatically reduced relative to germination in living crusts for all but P. basiramia. In four field experiments where crusts were left intact, disturbed (mechanically or by flaming), or completely removed, the effects of crusts were variable and species-specific, but were significant enough to impact aboveground population sizes. More germination was consistently observed in recently burned sites away from C. ericoides shrubs. Overall rates of germination were generally very low during this study, possibly as a result of seasonal droughts that could have reduced germination, increased seed dormancy, and/or decreased seed viability. The importance of water for germination was confirmed in an experiment with two watering regimes and three crust treatments designed to create a gradient of soil water availability. Germination was significantly greater in the high water treatment and unaffected by soil crust moisture. Dry years are not uncommon in scrub and the results of this study help us to understand how scrub herbs fare during drought and what role biological soil crusts play in germination.

Cryptogamic Disturbance Microbiotic Precipitation Rosemary scrub 

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References

  1. Abrahamson W.G., Johnson A.F., Layne J.N. and Peroni P.A. 1984. Vegetation of the Archbold Biological Station, Florida: an example of the southern Lake Wales Ridge. Florida Scientist 47: 209–250.Google Scholar
  2. Anatani Y.S. and Marathe K.V. 1974. Soil aggregating effects of some algae occurring in the soils of Kutch and Rajasthan. Journal of the University of Bombay 41: 94–100.Google Scholar
  3. Bailey D., Mazurak A.P., Rushforth S.R. and Johansen J.R. 1973. Aggregation of soil particles by algae. Journal of Phycology 9: 99–101.Google Scholar
  4. Bazzaz F.A. 1996. Plants in changing environments. Cambridge University Press, Cambridge, Great Britain.Google Scholar
  5. Belnap J. 1995. Surface disturbances: their role in accelerating desertification. Environmental Monitoring and Assessment 37: 39–57.Google Scholar
  6. Bertness M.D. and Callaway R. 1994. Positive interactions in communities. Trends in Ecology and Evolution 9: 191–193.Google Scholar
  7. Boeken B. and Shachak M. 1994. Desert plant communities in human-made patches - implications for management. Ecological Applications 4: 702–716.Google Scholar
  8. Broadleaf Industries, Inc. 1988. Broadleaf P4 water storing granules. Broadleaf Industries, Inc. Chula Vista, CA.Google Scholar
  9. Brotherson J.D. and Rushforth S.R. 1983. Influence of cryptogamic crusts on moisture relationships of soils in Navajo National Monument, Arizona. Great Basin Naturalist 43: 73–78.Google Scholar
  10. Bliss L.C. and Gold W.G. 1999. Vascular plant reproduction, establishment, and growth and the effects of cryptogamic crusts within a polar desert ecosystem, Devon Island, N.W.T., Canada. Canadian Journal of Botany 77: 623–636.Google Scholar
  11. Campbell S.E., Seeler J.S. and Glolubic S. 1989. Desert crust formation and soil stabilization. Arid Soil Research and Rehabilitation 3: 317–328.Google Scholar
  12. Callaway R.M. 1995. Positive interactions among plants. The Botanical Review 61: 306–349.Google Scholar
  13. Christman S.P. and Judd W.S. 1990. Notes on plants endemic to Florida scrub. Florida Scientist 53: 52–73.Google Scholar
  14. Codd G.A. 1995. Cyanobacterial toxins: occurrence, properties and biological significance. Water Science and Technology 32: 149–156.Google Scholar
  15. Dolan R.W., Yahr R., Menges E.S. and Halfhill M.D. 1999. Conservation implications of genetic variation in three rare species endemic to Florida rosemary scrub. American Journal Botany 86: 1556–1562.Google Scholar
  16. Eckert R.E. Jr., Peterson E.E., Mecresse M.S. and Stephens J.L. 1986. Effects of soil surface morphology on emergence and survival of seedlings in big sagebrush communities. Journal of Range Management 39: 414–420.Google Scholar
  17. Eldridge D.J. and Greene R.S.B. 1994. Microbiotic crusts: a review of their roles in soil and ecological processes in the rangelands of Australia. Australian Journal of Soil Resources 32: 389–415.Google Scholar
  18. Evans R.D. and Ehleringer J.R. 1993. A break in the nitrogen cycle in aridlands? Evidence from delta 15N of soils. Oecologia 94: 314–317.Google Scholar
  19. Fletcher J.E. and Martin W.P. 1948. Some effects of algae and molds in the rain-crust of desert soils. Ecology 29: 95–100.Google Scholar
  20. Fischer N.H., Williamson G.B., Weidenhamer J.D. and Richardson D.R. 1994. In search of allelopathy in the Florida scrub: the role of terpenoids. Journal of Chemical Ecology 20: 1355–1380.Google Scholar
  21. Gates D.M. 1993. Climate change and its biological consequences. Sinauer Associates, Sunderland, MA.Google Scholar
  22. Greene R.S.B., Chartres C.J. and Hodgkinson K.C. 1990. The effects of fire on the soil in a degraded semiarid woodland. 1. Cryptogam cover and physical and micromorphological properties. Australian Journal Soil Research 28: 755–777.Google Scholar
  23. Harper J.L. 1977. The population biology of plants. Academic Press, Inc., New York, NY.Google Scholar
  24. Harper K.T. and Marble J. R. 1988. A role for nonvascular plants in management of arid and semiarid rangelands. In Tueller P.J. (ed.), Application of plant sciences to rangeland management and inventory. Kluwer Academic Publishers, Boston, MA, pp. 137–169.Google Scholar
  25. Harper K.T. and Pendleton R.L. 1993. Cyanobacteria and cyanolichens: can they enhance availability of essential minerals for higher plants? Great Basin Naturalist 53: 59–72.Google Scholar
  26. Hawkes C. V. 2000. Soil crusts in a xeric Florida shrubland and their interactions with four herbaceous plants. Ph.D. dissertation. University of Pennsylvania, Philadelphia, Pennsylvania, USA.Google Scholar
  27. Hawkes C.V. and Flechtner V.R. 2002. Biological soil crusts in a xeric Florida shrubland: composition, abundance, and spatial heterogeneity of crusts with different disturbance histories. Microbial Ecology 43: 1–12.PubMedGoogle Scholar
  28. Hawkes C.V. and Menges E.S. 1996. The relationship between open space and fire for species in a xeric Florida shrubland. Bulletin of the Torrey Botanical Club 123: 81–92.Google Scholar
  29. Hawkes C.V. and Menges E.S. 1995. Density and seed production of a Florida endemic, Polygonella basiramia, in relation to time since fire and open sand. American Midland Naturalist 133: 138–148.Google Scholar
  30. Holzapfel C. and Mahall B.E. 1999. Bidirectional facilitation and interference between shrubs and annuals in the Mojave Desert. Ecology 80: 1747–171.Google Scholar
  31. Hunter M.E. and Menges E.S. 2002. Allelopathic effects of Ceratiola ericoides on seven rosemary scrub species. American Journal of Botany 89: 1113–1118.Google Scholar
  32. Johansen J.R. 1993. Cryptogamic crusts of semiarid and arid lands of North America. Journal of Phycology 29: 140–147.Google Scholar
  33. Johansen J.R. 1986. Importance of cryptogamic soil crusts to arid rangelands: implications for short duration grazing. In: Tiedeman J.A. (ed.), Short duration grazing. Washington State University, Pullman, WA, pp. 127–136.Google Scholar
  34. Johansen J.R., St. Clair L., Webb B.L. and Nebeker G.T. 1984. Recovery patterns of cryptogamic soil crusts in desert rangelands following fire disturbance. The Bryologist 87: 238–243.Google Scholar
  35. Johnson A.F. 1982. Some demographic characteristics of the Florida rosemary, Ceratiola ericoides Michx. American Midland Naturalist 108: 170–174.Google Scholar
  36. Johnson A.F. and Abrahamson W.G. 1990. A note on the fire responses of species in rosemary scrubs on the southern Lake Wales Ridge. Florida Scientist 53: 138–143.Google Scholar
  37. Kleiner E.F. and Harper K.T. 1977. Soil properties in relation to cryptogamic ground cover in Canyonlands National Park. Journal of Range Management 30: 202–205.Google Scholar
  38. Lesica P. and Shelley J.S. 1992. Effects of cryptogamic soil crust on the population dynamics of Arabis fecunda (Brassicaceae). American Midland Naturalist 128: 53–60.Google Scholar
  39. Lynch J.M. and Bragg E. 1985. Microorganisms and soil aggregate stability. Advances in Soil Science 2: 133–171.Google Scholar
  40. Mayland H.F., McIntosh T.H. and Fuller W.H. 1966. Fixation of isotopic nitrogen on a semiarid soil by algal crust organisms. Soil Science Society of America Proceedings 30: 56–60.Google Scholar
  41. Menges E.S. 1999. Ecology and conservation of Florida scrub. In: Anderson R.C., Fralish J.S. and Baskin J.M. (eds), Savannas, barrens, and rock outcrop plant communities of North America. Cambridge University Press, New York, NY, pp. 7–22.Google Scholar
  42. Menges E.S. and Hawkes C.V. 1998. Interactive effects of fire and microhabitat on plants of Florida scrub. Ecological Applications 8: 935–946.Google Scholar
  43. Menges E.S. and Kimmich J. 1996. Microhabitat and time since fire: effects on demography of Eryngium cuneifolium (Apiaceae), a Florida scrub endemic plant. American Journal of Botany 83: 185–191.Google Scholar
  44. Menges E.S. and Kohfeldt N. 1995. Life history strategies of Florida scrub plants in relation to fire. Bulletin of the Torrey Botanical Club 122: 282–297.Google Scholar
  45. Menges E.S. and Salzman V.T. 1991. Archbold Biological Station Plant List. Archbold Biological Station, Lake Placid, FL.Google Scholar
  46. Menges E.S. and Weekley C.W. 1999. Final report on continued ecological monitoring and experimental research on four Florida scrub endemic plants. Report to Division of Forestry, Department of Agriculture, Florida.Google Scholar
  47. Petru M. and Menges E.S. Seedling establishment in natural and experimental Florida scrub gaps. Journal of the Torrey Botanical Society, in press.Google Scholar
  48. Quintana-Ascencio P.F. 1997. Population viability analysis of a rare plant species in patchy habitats with sporadic fire. PhD Thesis, Dept. of Ecology and Evolution, State University of New York at Stony Brook.Google Scholar
  49. Quintana-Ascencio P.F. and Menges E.S. 1996. Inferring metapopulation dynamics from patch-level incidence of Florida scrub plants. Conservation Biology 10: 1210–1219.Google Scholar
  50. Quintana-Ascencio P.F. and Menges E.S. 2000. Competitive abilities of three narrowly endemic plant species in experimental neighborhoods along a fire gradient. American Journal of Botany 87: 690–699.PubMedGoogle Scholar
  51. Quintana-Ascencio P.F. and Morales-Hernandez M. 1997. Firemediated effects of shrubs, lichens, and herbs on the demography of Hypericum cumulicola in patchy Florida scrub. Oecologia 112: 263–271.Google Scholar
  52. Quintana-Ascencio P.F., Dolan R.W. and Menges E.S. 1998. Hypericum cumulicola demography in unoccupied and occupied Florida scrub patches with different time-since-fire. Journal of Ecology 86: 640–651.Google Scholar
  53. Quintana-Ascencio P.F., Menges E.S. and Weekley C.W. 2003. A fire-explicit population viability analysis of Hypericum cumulicola in Florida rosemary scrub. Conservation Biology 17: 433–449.Google Scholar
  54. Rychert R.C. and Skujiņš J. 1974. Nitrogen fixation by blue-green algae-lichen crusts in the Great Basin Desert. Soil Society of America Proceedings 38: 768–771.Google Scholar
  55. St. Clair L.L., Webb B.L., Johansen J.R. and Nebeker G.T. 1984. Cryptogamic soil crusts: enhancement of seedling establishment in disturbed and undisturbed areas. Reclamation and Revegetation Research 3: 129–136.Google Scholar
  56. Schupp E.W. 1995. Seed-seedling conflicts, habitat choice, and patterns of plant recruitment. American Journal of Botany 82: 399–409.Google Scholar
  57. Shem-Tov S., Zaady E., Groffman P.M. and Gutterman Y. 1999. Soil carbon content along a rainfall gradient and inhibition of germination: a potential mechanism for regulating distribution of Plantago coronopus. Soil Biology and Biochemistry 31: 1209–1217.Google Scholar
  58. Skujiņš J. 1981. Nitrogen cycling in arid ecosystems. Ecological Bulletin (Stockholm) 33: 477–491.Google Scholar
  59. Skujiņš J. 1984. Microbial ecology of desert soils. In: Marshall C.C. (ed.), Advances in microbial ecology, Vol. 7. Plenum Press, New York, NY, pp. 49–91.Google Scholar
  60. SPSS forWindows 1999. Rel. 10.0.0. SPSS, Inc., Chicago, Illinois.Google Scholar
  61. Verrecchia E., Yair A., Kidron G.J. and Verrecchia K. 1995. Physical properties of the psammophile cryptogamic crust and their consequences to the water regime of sandy soils, north-western Negev Desert, Israel. Journal of Arid Environments 29: 427–437.Google Scholar
  62. Warren S.D. 2001. Synopsis: influence of biological soil crusts on arid land hydrology and soil stability. In: Belnap J. and Lange O.L. (eds), Biological soil crusts: structure, function, and management. Springer-Verlag, Berlin, Germany, pp. 349–362.Google Scholar
  63. West N.E. 1990. Structure and function of microphytic soil crusts in wildland ecosystems of arid to semi-arid regions. Advances in Ecological Research 20: 179–223.Google Scholar
  64. Williams J.D., Dobrowolski J.P., West N.E. and Gillette D.A. 1995a. Microphytic crust influence on wind erosion. Transactions of the American Society of Agricultural Engineers 38: 131–137.Google Scholar
  65. Williams J.D., Dobrowolski J.P. and West N.E. 1995b. Microphytic crust influence on interill erosion and infiltration capacity. Transactions of the American Society of Agricultural Engineers 38: 139–146.Google Scholar
  66. Wunderlin R.P. 1998. Guide to the vascular plants of Florida. University Press of Florida, Gainesville FL.Google Scholar
  67. Young C.C. and Menges E.S. 1999. Postfire gap-phase regeneration in scrubby flatwoods on the Lake Wales Ridge. Florida Scientist 62: 1–12.Google Scholar
  68. Zaady E., Gutterman Y. and Boeken B. 1997. The germination of mucilaginous seeds of Plantago coronopus, Reboudia pinnata and Carrichtera annua on cyanobacterial soil crust from the Negev Desert. Plant and Soil 190: 247–252.Google Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Christine V. Hawkes
    • 1
  1. 1.Department of Biology, Leidy LaboratoriesUniversity of PennsylvaniaPhiladelphia

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