Biologia Plantarum

, Volume 44, Issue 2, pp 269–275 | Cite as

Allelopathic Effects of Tree Species on Some Soil Microbial Populations and Herbaceous Plants

  • X.C. Souto
  • J.C. Bolaño
  • L. González
  • M.J. Reigosa


The allelopathic potential of four tree species on soil microbial populations and some herbaceous plants (two understory species and one general biotest species) was investigated. Effects of three nonindigenous tree species, Eucalyptus globulus Labill, Pinus radiata D.Don and Acacia melanoxylon R.Br., on microorganisms participating in the cycle of nitrogen were evaluated, comparing them with those produced by the autochthonous Quercus robur L. Influence of the trees on Lactuca sativa L., Dactylis glomerata L. and Trifolium repens L. was also checked in bioassays. Cell numbers of Nitrosomonas sp. were negatively affected by Acacia and Eucalyptus stands, mainly during spring, when flowers are especially abundant on the ground. Proteolytic microorganisms were also negatively affected by Eucalyptus and Pinus stands, whilst Quercus stand did not show any toxicity. Soil bioassays showed clear inhibitory effects on germination and growth of understory plants, particularly soils from Eucalyptus and Acacia stands. The greatest effects had the soil from Acacia stand, which was phytotoxic during the whole period of germination and growth of understory plants. Allelopathic phenomena could be, at least partially, responsible of the low species diversity in the understory of the nonindigenous tree stands.

Acacia melanoxylon Dactylis glomerata Eucalyptus globulus Lactuca sativa nitrogen cycle Pinus radiata Quercus robur Trifolium repens 


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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • X.C. Souto
    • 1
  • J.C. Bolaño
    • 2
  • L. González
    • 2
  • M.J. Reigosa
    • 2
  1. 1.Departamento de Ingeniería de los Recursos Naturales y Medio Ambiente, E.U.E.T. ForestalUniversidade de VigoPontevedraSpain
  2. 2.Departamento de Bioloxía Vexetal e Ciencia do Solo, Facultade de Ciencias de VigoUniversidade de VigoVigoSpain

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