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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/9243 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/9243 http://eprints.org/relation/issmallThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/9243 archive 137 disk0/00/00/20/59 2015-04-16 06:13:36 2015-04-16 06:13:36 2015-04-16 06:13:36 article 469 show Kikvidze Zaal zaal.kikvidze@iliauni.edu.ge pub QEC ins18 public Alpine plant communities are very suitable for ecological experiments that study plant-plant interactions. Actually, in mountains we find magnitude of environmental gradients and well­ pronounced spatial patterns with strong shifts between competition and facilitation. These advantages were especially useful for the experimental testing of the abiotic stress hypothesis, which states that in a plant community neighboring individuals may have both competitive and facilitative effects on each other, and that the relative importance of facilitation increases with the harshness of the environment. The experimental data obtained from alpine gradients support well this hypothesis, and indicate to a probable balance of competition and facilitation in most plant communities that are moderately stressful. The goal for further experiments may be disclosing the mechanisms of this balance. 1998 Global Environmental Research 9 261-264 TRUE