A field test of the stress-gradient hypothesis along an aridity gradient

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Designing resilient and sustainable grasslands for a drier future: Adaptive strategies, functional traits and biotic interactions (2013, background): “Hence, if facilitation among species is a potential means by which plant performance may be enhanced, it should be most apparent under severe stress or in resource-poor environments (Callaway et al. 2002; Maestre et al. 2009; Armas et al. 2011).”
Soil microbial community under a nurse-plant species changes in composition, biomass and activity as the nurse grows (2013, background): “Mature R. sphaerocarpa shrubs promote plant growth and species richness,which are at least 3 times higher under the canopy than in open areas (gaps) around shrubs (Pugnaire et al., 2004; Armas et al., 2011).”