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This article in JEQ

  1. Vol. 26 No. 3, p. 748-752
     
    Received: Apr 23, 1996
    Published: May, 1997


    * Corresponding author(s): mmeyer@lamer.colostate.edu
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doi:10.2134/jeq1997.00472425002600030022x

Phytotoxicity of Depleted Uranium on Three Grasses Characteristic of Different Successional Stages

  1. Michael C. Meyer * and
  2. Terry McLendon
  1. C enter for Ecological Risk Assessment and Management, Dep. of Fishery and Wildlife Biology, Colorado State Univ., Fort Collins, CO 80523;
    D ep. of Biological Sciences, Univ. of Texas-El Paso, El Paso, TX 79968.

Abstract

Abstract

In response to a paucity of data on the chemical toxicity of uranium (U) to plants, a factorial experiment employing five U concentrations (0, 50, 500, 5000, 25 000 mg kg−1) and three moisture regimes (low, medium, and high) was performed using three native grasses. Buchloe dactyloides (buffalograss; mid/late-seral), Schizachyrium scoparium (little bluestem; late-seral), and Aristida purpurea (purple threeawn; early/mid-seral) were grown in monocultures and as a mixture of two species under all combinations of U and moisture levels. This design allowed for the analysis of U effects, as well as possible interactions with moisture stress. Several measures of plant health and viability were made, including: percent emergence, plant survival, shoot biomass, and number and weight of inflorescences. Decreases in plant biomass, fecundity, and long-term survivability were observed only at the highest U level (25 000 mg kg 1). No significant differences (P < 0.05) between the U treatment levels were observed in terms of seedling emergence and survival. Drought stress also negatively impacted survival and biomass, but acted independently of U stress.

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