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Oecologia

, Volume 99, Issue 1–2, pp 21–26 | Cite as

Plant demographic responses to mycorrhizal symbiosis in tallgrass prairie

  • D. C. Hartnett
  • R. J. Samenus
  • L. E. Fischer
  • B. A. D. Hetrick
Original Paper

Abstract

The effects of mycorrhizal symbiosis on seedling emergence, flowering and densities of several grasses and forbs were assessed in native tallgrass prairie and in sown garden populations at the Konza Prairie in northeastern Kansas. Mycorrhizal activity was experimentally suppressed with the fungicide benomyl. Flowering and stem densities of the cool-season grass, Dichanthelium oligosanthes, sedges (Carex spp.), and the forb Aster ericoides were higher in non-mycorrhizal (benomyl-treated) than in mycorrhizal plots and the magnitude of these differences was significantly affected by burning. Mycorrhizae significantly enhanced flowering of the warmseason grasses Andropogon gerardii and Sorghastrum nutans in burned prairie, but not in unburned sites. These patterns suggest that mycorrhizal effects on the dynamics of cool-season graminoid and forb populations are likely to be mediated indirectly through effects of the symbiosis on the competitive dominance of their neighbors. Seedling emergence rates of the cool-season C3 grasses Elymus canadensis and Koeleria cristata were significantly reduced in the benomyl-treated plots, whereas benomyl treatment had no significant effect on seedling emergence of the warm-season C4 grasses A. gerardii and Panicum virgatum. The forbs showed variable responses. Seedling emergence of Liatris aspera was greater under mycorrhizal conditions, but that of Dalea purpurea was unaffected by mycorrhizal treatment. These results show that effects of mycorrhizal symbiosis on the population dynamics of co-occurring prairie plants vary significantly both among species and among different life history stages within species. The results also indicate that mycorrhizas and fire interact to influence competitive interactions and demographic patterns of tallgrass prairie plant populations.

Key words

Tallgrass prairie VA mycorrhizas Plant demography Fire 

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References

  1. Abbott LK, Robson AD (1984) The effect of VA mycorrhizae on plant growth. In: Powell CL, Bagyaraj DJ (eds) Mycorrhizae. CRC Press, Boca Raton, Florida, pp 113–130Google Scholar
  2. Allen MF (1982) Influence of vesicular-arbuscular mycorrhizae on water movement through Bouteloua gracilis (H.B.K.) Lag ex Steud. New Phytol 91: 191–196Google Scholar
  3. Allen MF (1991) The ecology of mycorrhizae. Cambridge University Press, Cambridge, UKGoogle Scholar
  4. Bazzaz FA, Parrish JAD (1982) Organization of grassland communities. In: Tyrl JR, Brunker JN (eds) Grasses and grasslands: systematics and ecology. University of Oklahoma Press, Norman, pp 233–254Google Scholar
  5. Bentivenga SP, Hetrick BAD (1991) Relationship between mycorrhizal activity, burning, and plant productivity in tallgrass prairie. Can J Bot 69: 2597–2602Google Scholar
  6. Bentivenga SP, Hetrick BAD (1992) The effects of prairie management practices on mycorrhizal symbiosis. Mycologia 84: 522–527Google Scholar
  7. Bergelson JM, Crawley MJ (1988) Mycorrhizal infection and plant species diversity. Nature 334: 202Google Scholar
  8. Carey PD, Fitter AH, Watkinson AR (1992) A field study using the fungicide benomyl to investigate the effect of mycorrhizal fungi on plant fitness. Oecologia 90: 550–555Google Scholar
  9. Chiariello N, Hickman JC, Mooney HA (1982) Endomycorrhizal role for interspecific transfer of phosphorus in a community of annual plants. Science 217: 941–943Google Scholar
  10. Cox G, Sanders FE, Wild JA (1975) Ultrastructural evidence relating to host-endophyte transfer in vesicular-arbuscular mycorrhiza. In: Sander FE, Mosse B, Tinker PB (eds) Endomycorrhizas. Academic Press, New York, pp 297–312Google Scholar
  11. Fitter AH (1977) Influence of mycorrhizal infection on competition for phosphorus and potassium by two grasses. New Phytol 79: 119–125Google Scholar
  12. Fitter AH (1986) Effect of Benomyl on leaf phosphorus concentration in alpine grassland: a test of mycorrhizal benefit. New Phytol 103: 767–776Google Scholar
  13. Freeman CC, Hulbert LC (1985) An annotated list of the vascular flora of Konza Prairie Research Natural Area, Kansas. Trans Kans Acad Sci 88: 84–115Google Scholar
  14. Gibson DJ, Hetrick BAD (1988) Topographic and fire effects on the composition and abundance of VA-mycorrhizal fungi on tallgrass prairie. Mycologia 80: 433–451Google Scholar
  15. Goldberg DE, Barton AM (1992) Patterns and consequences of interspecific competition in natural communities: a review of field experiments with plants. Am Nat 139: 771–801Google Scholar
  16. Grime JP, MacKey JM, Hillier SH, Reid DJ (1987) Floristic diversity in a model system using experimental microcosms. Nature 328: 420–422Google Scholar
  17. Hall IR (1978) Effects of endomycorrhizas on the competitive ability of white clover. New Z J Agric Res 21: 509–515Google Scholar
  18. Hartnett DC (1990) Size-dependent allocation to seed and vegetative reproduction in four clonal composites. Oecologia 84: 254–259Google Scholar
  19. Hartnett DC (1991) Effects of fire in tallgrass prairie on growth and reproduction of prairie coneflower (Ratibida columnifera: Asteraceae). Am J Bot 78: 429–435Google Scholar
  20. Hartnett DC, Hetrick BAD, Wilson GTW, Gibson DJ (1993) Mycorrhizal influence on intra- and interspecific neighbour interactions among co-occurring prairie grasses. J Ecol 81: 787–795Google Scholar
  21. Hetrick BAD (1989) Acquistion of phosphorus by VA mycorrhizal fungi and the growth responses of their host plants. In: Boddy L, Marchant R, Read DJ (eds) Nitrogen, phosphorus, and sulfur utilization by fungi. Cambridge University Press, Cambridge UK pp 205–227Google Scholar
  22. Hetrick BAD, Bloom J (1983) Vesicular-arbuscular mycorrhizal fungi associated with native tallgrass prairie and cultivated winter wheat. Can J Bot 61: 2140–2146Google Scholar
  23. Hetrick BAD, Gerschefske Kitt D, Wilson GWT (1988) Mycorrhizal dependence and growth habit of warm-season and cool-season tallgrass prairie plants. Can J Bot 66: 1376–1380Google Scholar
  24. Hetrick BAD, Wilson GWT, Hartnett DC (1989) Relationship between mycorrhizal dependence and competitive ability of two tallgrass prairie grasses. Can J Bot 67: 2608–2615Google Scholar
  25. Hetrick BAD, Wilson GWT, Todd TC (1990) Differential responses of C3 and C4 grasses to mycorrhizal symbiosis, phosphorus fertilization, and soil microorganisms. Can J Bot 68: 461–467Google Scholar
  26. Hetrick BAD, wilson GWT, Todd TC (1992) Relationships of mycorrhizal symbiosis, rooting strategy, and phenology among tallgrass prairie forbs. Can J Bot 70: 1521–1528Google Scholar
  27. Janos DP (1980) Mycorrhizae influence tropical succession. Biotropica 12: 56–64Google Scholar
  28. Knapp AK (1984) Effect of fire in tallgrass prairie on seed production of Vernonia baldwinii Torr. (Compositae). Southwest Nat 29: 242–243Google Scholar
  29. Knapp AK, Hulbert LC (1986) Production, density and height of flower stalks of three grasses in annually burned and unburned eastern Kansas tallgrass prairie: a four year record. Southwest Nat 31: 235–241Google Scholar
  30. Knapp AK, Seastedt TR (1986) Detritus accumulation limits productivity of tallgrass prairie. Bioscience 36: 662–668Google Scholar
  31. Kuchler AW (1964) Potential natural vegetation of the conterminous United States. Am Geogr Soc Spec Pub no. 36Google Scholar
  32. Kuchler AW (1967) Some geographic features of the Kansas prairie. Trans Kans Acad of Sci 70: 388–401Google Scholar
  33. Mosse B, (1973) Advances in the study of vesicular-arbuscular mycorrhiza. Annu Rev Phytopathol 11: 171–195Google Scholar
  34. Mosse B, Stribley DP, LeTacon F (1981) Ecology of mycorrhizae and mycorrhizal fungi. Adv Microb Ecol 5: 137–210Google Scholar
  35. Nelson CE, Safir GR (1982) Increased drought tolerance of mycorrhizal onion plants caused by improved phosphorus nutrition. Planta 154: 407–415Google Scholar
  36. Newman EI, Reddell P (1987) The distribution of mycorrhizas among families of vascular plants. New Phytol 106: 745–751Google Scholar
  37. Paul ND, Aryes PG, Wyness LE (1989) On the use of fungicides for experimentation in natural vegetation. Funct Ecol 3: 759–769Google Scholar
  38. Phillips JM, Hayman DS (1970) Improved procedures for clearing roots and staining parasitic and vesicular-arbuscular mycorrhizal fungi for rapid assessment of infection. Trans Brit Mycol Soc 55: 158–160Google Scholar
  39. Read DJ (1984) The structure and function of the vegetative mycelium of mycorrhizal roots. In: Jennings DH, Rayner ADM, (eds) The ecology and physiology of fungal mycelium. Cambridge University Press, Cambridge UK, pp 215–240Google Scholar
  40. SAS Institute Inc. 1988. SAS/STAT User's guide, release 6.03. SAS Institute Inc. Cary, NCGoogle Scholar
  41. Turkington R, Mehrhoff LA (1990) The role of competition in structuring pasture communities. In: Grace JB, Tilman D (eds) Perspectives on plant competition. Academic Press, San Diego, pp 308–340Google Scholar

Copyright information

© Springer Verlag 1994

Authors and Affiliations

  • D. C. Hartnett
    • 1
  • R. J. Samenus
    • 1
  • L. E. Fischer
    • 1
  • B. A. D. Hetrick
    • 2
  1. 1.Division of BiologyKansas State UniversityManhattanUSA
  2. 2.Department of Plant PathologyKansas State UniversityManhattanUSA

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