, Volume 81, Issue 2, pp 149–153 | Cite as

The timing and degree of root proliferation in fertile-soil microsites for three cold-desert perennials

  • R. B. Jackson
  • M. M. Caldwell
Original Papers


Root proliferation in nutrient-rich soil patches is an important mechanism facilitating nutrient capture by plants. Although the phenomenon of root proliferation is well documented, the specific timing of this proliferation has not been investigated. We studied the timing and degree of root proliferation for three perennial species common to the Great Basin region of North America: a shrub, Artemisia tridentata, a native tussock grass, Agropyron spicatum, and an introduced tussock grass, Agropyron desertorum. One day after we applied nutrient solution to small soil patches, the mean relative growth rate of Agropyron desertorum roots in these soil patches was two to four times greater than for roots of the same plants in soil patches reated with distilled water. Most of the increased root growth came from thin, laterally branching roots within the patches. This rapid and striking root proliferation by Agropyron desertorum occurred in response to N-P-K enrichment as well as to P or N enrichment alone. A less competitive bunchgrass, Agrophyron spicatum, showed no tendency to proliferate roots in enriched soil patches during these two-week experiments. The shrub Artemisia tridentata proliferated roots within one day of initial solution injection in the N-enrichment experiment, but root proliferation of this species was more gradual and less consistent in the N-P-K and P-enrichment experiments, respectively. The ability of Agropyron desertorum to proliferate roots rapidly may partly explain both its general competitive success and its superior ability to exploit soil nutrients compared to Agropyron spicatum in Great Basin rangelands of North America.

Key words

Agropyron Artemisia Belowground competition Pseudoroegneria Root proliferation 


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  1. Barber SA (1984) Soil nutrient bioavailability. John Wiley and Sons, New YorkGoogle Scholar
  2. Barkworth ME, Dewey DR (1985) Genomically based genera in the perennial Tritaceae of North America: identification and membership. Am J Bot 72:767–776Google Scholar
  3. Galdwell MM, Richards JH (1986) Competing root systems: morphology and models of absorption. In: Givnish TJ (ed) On the economy of plant form and function. Cambridge University Press, Cambridge, pp 251–273Google Scholar
  4. Caldwell MM, Richards JH, Johnson DA, Nowak RS, Dzurec RS (1981) Coping with herbivory: photosynthetic capacity and resource allocation in two semiarid Agropyron bunchgrasses. Oecologia 50:14–24Google Scholar
  5. Caldwell MM, Eissenstat DM, Richards JH, Allen MF (1985) Competition for phosphorus: differential uptake from dualisotope-labeled soil interspaces between shrub and grass. Science 229:384–386Google Scholar
  6. Chapin FS III (1980) The mineral nutrition of wild plants. Ann Rev Ecol Syst 11:233–260Google Scholar
  7. Crick JC, Grime JP (1987) Morphological plasticity and mineral nutrient capture in two herbaceous species of contrasted ecology. New Phytol 107:403–414Google Scholar
  8. Drew MC, Saker LR (1975) Nutrient supply and the growth of the seminal root system in barley. II. Localized, compensatory increases in lateral root growth and rates of nitrate uptake when nitrate supply is restricted to only part of the root system. J Exp Bot 26:79–90Google Scholar
  9. Drew MC, Saker LR (1978) Nutrient supply and the growth of the seminal root system in barley. III. Compensatory increases in growth of lateral roots, and in rates of phosphate uptake, in response to a localized supply of phosphate. J Exp Bot 29:435–451Google Scholar
  10. Duncan WG, Ohlrogge AJ (1958) Principles of nutrient uptake from fertilizer bands. II. Root development in the band. Agron J 50:605–608Google Scholar
  11. Eissenstat DM, Caldwell MM (1987) Characteristics of sucessful competitors: an evaluation of potential growth rate in two cold desert tussock grasses. Oecologia 71:167–173Google Scholar
  12. Eissenstat DM, Caldwell MM (1988a) Seasonal timing of root growth in favorable microsites. Ecology 69:870–873Google Scholar
  13. Eissenstat DM, Caldwell MM (1988b) Competitive ability is linked to rates of water extraction: a field study of two aridland tussock grasses. Oecologia 75:1–7Google Scholar
  14. Grime JP, Crick JC, Rincon JE (1986) The ecological significance of plasticity. In: Jennings DH, Trewavas AJ (eds) Plasticity in plants. Cambridge University Press, Cambridge, pp 5–29Google Scholar
  15. Gurevitch J, Chester ST Jr (1986) Analysis of repeated measures experiments. Ecology 67:251–255Google Scholar
  16. Newman EI (1966) A method of estimating the total length of root in a sample. J Appl Ecol 3:139–145Google Scholar
  17. Nye PH, Tinker PB (1977) Solute movement in the soil-root system. University of California Press, Berkeley, Los AngelesGoogle Scholar
  18. Passioura JB, Wetselaar R (1972) Consequences of banding nitrogen fertilizers in soil. II. Effects on the growth of wheat roots. Plant Soil 36:461–473Google Scholar
  19. Richards JH (1984) Root growth response to defoliation in two Agropyron bunchgrasses: field observations with an improved root periscope. Oecologia 64:21–25Google Scholar
  20. Snaydon RW (1962) Micro-distribution of Trifolium repens L. and its relation to soil factors. J Ecol 50:133–143Google Scholar
  21. St. John TV, Coleman DC, Reid CPP (1983) Growth and spatial distribution of nutrient-absorbing organs: selective exploitation of soil heterogeneity. Plant Soil 71:487–493Google Scholar
  22. Tennant D (1975) A test of a modified line intersect method of estimating root length. J Ecol 63:995–1001Google Scholar
  23. Tilman D (1982) Resource competition and community structure. Princeton University Press, Princeton, New JerseyGoogle Scholar
  24. Tilman D (1988) Plant strategies and the dynamics and structure of plant communities. Princeton University Press, Princeton, New JerseyGoogle Scholar

Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • R. B. Jackson
    • 1
  • M. M. Caldwell
    • 1
  1. 1.Range Science Department and the Ecology Center Utah State UniversityLoganUSA

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