Evaluation of the Conceptual Model on Shrubbiness-Desertification on Arid Rangelands
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Abstract
Advancement of shrubbiness (increase in plant cover and density of woodyspecies) on different environments world-wide has generated an increasing interest in
the scientific community, particularly because of its association with the desertification
process which is increasing, also at a world-wide level. There are two opposing
positions, both of them validated by scientific evidences. The greatly accepted position
recognizes shrubbiness as one of the mechanisms conducive to desertification in natural
environments, cataloguing it as a negative process. A different view, based on recent
studies, suggests that shrubbiness should be considered as a positive process because it
may drive a reversal of desertification, depending on the environment and the species
of shrub studied at a site. This review presented within this framework discusses the
existing relationship between shrubbiness and desertification and proposes an approach
that should be considered in future research.
Key words: Shrubbiness, desertification, arid rangelands, arbuscular mycorrhiza, soil
biological crusts.
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