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Boron, Zinc, Iron, and Manganese Content in Four Grassland Species

Campus Universitario, Edidficio de Ciencias, Ecologia, Univ. de Alcala de Henares, Carretera Madrid-Barcelona, Km 33.600, 28871 Alcala de Henares, Madrid, Spain;

A. Gil and J. Pastor^*

Environmental Sciences Research Center, CSIC Serrano, 115, 28006, Madrid, Spain.

^* Corresponding author (ebvpp64{at}fresno.csic.es).

ABSTRACT

A pot experiment was carried out to test the response of the B, Zn, Fe, and Mn concentration in four wild herbaceous species exposed to three landfill leachate treatments of increasing concentration of contaminants. The species tested were clustered clover (Trifolium glomeratum L.), cotton clover (T. tomentosum L.), wall barley (Hordeum murinum L.), and soft brome (Bromus hordaceus L.). The legume species accumulated more Fe and B than the grasses. The least contaminated leachate (leachate A) significantly increased the Fe and Mn content in T. glomeratum. Leachate B significantly increased the Zn content in both clover species and Fe content in T. glomeratum and H. murinum, while it significantly decreased the B content in T. glomeratum. The most contaminated leachate (leachate C) significantly increased the Zn content in T. glomeratum, while it significantly decreased the B and Fe content. In the four species the content of B, Fe, and Mn in the plants under the leachate treatments was in a normal values range, while in T. glomeratum and H. murinum the Zn content had in some cases a toxic level (>100 mg L^–1). The dry weight of the four species tested diminished significantly under the most contaminated leachate. The ANOVA confirmed a major significant influence of the "species factor" on the response of the plant to leachate supply, but the treatment factor also had significant F-values in some cases. The species tested have a potential revegetation value for some areas degraded by landfill leachates.