, Volume 83, Issue 1, pp 7–13 | Cite as

Soil water exploitation after fire: competition between Bromus tectorum (cheatgrass) and two native species

  • Graciela Melgoza
  • Robert S. Nowak
  • Robin J. Tausch
Original Papers


Causes for the widespread abundance of the alien grass Bromus tectorum (cheatgrass) after fire in semiarid areas of western North America may include: (1) utilization of resources freed by the removal of fireintolerant plants; and (2) successful competition between B. tectorum and individual plants that survive fire. On a site in northwestern Nevada (USA), measurements of soil water content, plant water potential, aboveground biomass production, water use efficiency, and B. tectorum tiller density were used to determine if B. tectorum competes with either of two native species (Stipa comata and Chrysothamnus viscidiflorus) or simply uses unclaimed resources. Soil water content around native species occurring with B. tectorum was significantly lower (P<0.05) than around individuals without B. tectorum nearby. Native species had significantly more negative plant water potential when they occurred with B. tectorum. Aboveground biomass was significantly higher for native species without B. tectorum. However, the carbon isotope ratio of leaves for native species with B. tectorum was not significantly different from individuals without B. tectorum. Thus, B. tectorum competes with native species for soil water and negatively affects their wate status and productivity, but the competition for water does not affect water use efficiency of the native species. These adverse effects of B. tectorum competition on the productivity and water status of native species are also evident at 12 years after a fire. This competitive ability of B. tectorum greatly enhances its capability to exploit soil resources after fire and to enhance its status in the community.

Key words

Soil water content Water use efficiency Carbon isotope ratio Stipa comata Chrysothamnus viscidiflorus 


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  1. Antos JA, McCune B, Bara C (1983) The effect of fire on an ungrazed western Montana grassland. Am Midl Nat 110:354–364Google Scholar
  2. Bookman PA (1982) Microsite utilization by Bromus tectorum L. and Poa pratensis L. in a meadow steppe community. Oecologia 56:413–418Google Scholar
  3. Bradford JM, Grossman RB (1982) In-situ measurement of nearsurface soil strength by the fall-cone device. Soil Sci Soc Am J 46:685–688Google Scholar
  4. Cable DR (1967) Fire effects on semidesert grasses and shrubs. J Range Manage 20:170–176Google Scholar
  5. Caldwell MM, Richards JH (1986) Competing root systems: morphology and models of absorption. In: TJ Givnish (ed) On the economy of plant form and function. Cambridge University Press, Cambridge, pp 251–273Google Scholar
  6. Conrad CE, Poulton CE (1966) Effect of a wildfire on Idaho fescue and bluebunch wheatgrass. J Range Manage 19:138–141Google Scholar
  7. Daubenmire R (1968) Ecology of fire in grasslands. Adv Ecol Res 5:209–266Google Scholar
  8. Eckert RE Jr, Evans RA (1963) Responses of downy brome and crested wheatgrass to nitrogen and phosphorous in nutrient solution. Weeds 11:170–174Google Scholar
  9. Evans RA, Holbo HR, Eckert RE Jr, Young JA (1970) Functional environment of downy brome communities in relation to weed control and revegetation. Weed Sci 18:154–162Google Scholar
  10. Evans RA, Young JA (1977) Weed control-revegetation systems for big sagebrush-downy brome rangelands. J Range Manage 30:331–336Google Scholar
  11. Farquhar GD, O'Leary MH, Berry JA (1982) On the relationship between carbon isotope discrimination and the intercellular carbon dioxide concentration in leaves. Aust J Plant Physiol 9:121–137Google Scholar
  12. Harniss RO, Murray RB (1973) 30 years of vegetal change following burning of sagebrush-grass range. J Range Manage 26:322–325Google Scholar
  13. Harris GA (1967) Some competitive relationships between Agropyron spicatum and Bromus tectorum. Ecol Monog 37:89–111Google Scholar
  14. Harris GA, Wilson AM (1970) Competition for moisture among seedlings of annual and perennial grasses as influenced by root elongation at low temperature. Ecology 51:530–534Google Scholar
  15. Hauser VL (1984) Neutron meter calibration and error control. Trans ASAE 27:722–728Google Scholar
  16. Hobbs NT, Schimel DS (1984) Fire effects on nitrogen mineralization and fixation in mountain shrub and grassland communities. J Range Manage 37:402–405Google Scholar
  17. Hull AC Jr (1963) Competition and water requirements of cheatgrass and wheatgrasses in the greenhouse. J Range Manage 16:199–204Google Scholar
  18. Kay BL, Evans RA (1965) Effects of fertilization on a mixed stand of cheatgrass and intermediate wheatgrass. J Range Manage 18:7–11Google Scholar
  19. Klemmedson JO, Smith JG (1964) Cheatgrass (Bromus tectorum L.). Bot Rcv 30:226–262Google Scholar
  20. Knapp AK (1984) Post-burn differences in solar radiation, leaf temperature and water stress influencing production in a lowland tallgrass prairie. Am J Bot 71:220–227Google Scholar
  21. Koviac DA, Swift DM, Ellis JE, Hakonson TE (1986) Immediate effects of prescribed burning on mineral soil nitrogen in ponderosa pine of New Mexico. Soil Sci 141:71–76Google Scholar
  22. Mack RN (1981) Invasion of bromus tectorum L. into western North America: An ecological chronicle. Agro-Ecosystems 7:145–165Google Scholar
  23. Mack RN, Pyke DA (1983) The demography of Bromus tectorum: variation in time and space. J Ecol 71:69–93Google Scholar
  24. Old SM (1969) Microclimate, fire, and plant production in an Illinois prairie. Ecol Monog 39:355–384Google Scholar
  25. Pyke DA (1987) Demographic responses of Bromus tectorum and seedlings of Agropyron spicatum to grazing by small mammals: The influence of grazing frequency and plant age. J Ecol 75:825–835Google Scholar
  26. Raison RJ (1979) Modification of the soil environment by vegetation fires with particular reference to nitrogen transformations: a review. Plant Soil 51:73–108Google Scholar
  27. Redmann RE (1978) Plant and soil water potentials following a fire in a northern mixed grassland. J Range Manage 31:443–445Google Scholar
  28. Reginato RJ, Nakayama FS (1988) Neutron probe calibration based on plastic transfer standards. Soil Sci 145:381–384Google Scholar
  29. Rundel PW, Parsons DJ (1984) Post-fire uptake of nitrients by diverse ephemeral herbs in chamise chaparral. Oecologia 61:285–288Google Scholar
  30. Smith SD, Nowak RS (1990) Physiological ecology of plants in the intermountain lowlands. In: Osmond CB, Pitelka LF, Hidy G (eds) Ecological Studies, Vol 79, Plant Biology of the Basin and Range (in press)Google Scholar
  31. Stewart G, Hull AC (1949) Cheatgrass (Bromus tectorum L.) —An ecological intruder in southern Idaho. Ecology 30:58–74Google Scholar
  32. Turner NC, Long JL (1980) Errors arising from rapid water loss in the measurement of leaf water potential by the pressure chamber technique. Aust J Plant Physiol 7:527–537Google Scholar
  33. Uresk DW, Cline JF, Rickard WH (1976) Impact of wildfire on three perennial grasses in south-central Washington. J Range Manage 29:309–310Google Scholar
  34. Van Bavel CHM, Nixon PR, Hauser VL (1963) Soil moisture measurement with the neutron method.USDA, ARS-41-70Google Scholar
  35. Wilson AM, Harris GA, Gates DH (1966) Fertilization of mixed cheatgrass-bluebunch wheatgrass stands. J Range Manage 19:134–137Google Scholar
  36. Wright HA (1971) Why squirreltail is more tolerant to burning than needle-and-thread. J Range Manage 24:277–284Google Scholar
  37. Wright HA, Bailey AW (1982) Fire ecology. United States and Southern Canada. Wiley and Sons, New York 501 pGoogle Scholar
  38. Wright HA, Klemmedson JO (1965) Effect of fire on bunchgrasses of the sagebrush-grass region in southern. Idaho. Ecology 46:680–688Google Scholar
  39. Young JA, Evans RA (1973) Downy brome—Intruder in the plant succession of big sagebrush communities in the Great Basin J Range Manage 26:410–415Google Scholar
  40. Young JA, Evans RA (1978) Population dynamics after wildfires in sagebrush grasslands. J Range Manage 31:283–289Google Scholar
  41. Young JA, Evans RA, Eckert RE Jr (1969) Population dynamics of downy brome. Weed Sci 17:20–26Google Scholar
  42. Young RP (1983) Fire as a vegetation management tool in rangelands of the intermountain region. In: SB Monsen and Shaw (compilers). Managing Intermountain Rangelands: Improvement of Range and Wildlife Habitats USDA Gen Tech Rep INT-157 pp 18–31Google Scholar
  43. Young RP, Miller RF (1985) Response of Sitanion hystrix (Nutt) JG Smith to prescribed burning. Am Midl Nat 113:182–187Google Scholar

Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • Graciela Melgoza
    • 1
  • Robert S. Nowak
    • 1
  • Robin J. Tausch
    • 1
  1. 1.Department of Range Wildlife and ForestryUniversity of Nevada RenoRenoUSA

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