The effects of spatially heterogeneous nutrient supply on yield, intensity of competition and root placement patterns in Briza media and Festuca ovina

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The effects of spatial pattern of nutrient supply on yield, structure and mortality in plant populations (2003, background): “Day et al. (2003a) observed significant yield benefits after 31 days in populations of Cardamine hirsuta grown under heterogeneous conditions compared with populations in homogeneous conditions with the same overall level of nutrient supply.”
Does pattern of soil resource heterogeneity determine plant community structure? An experimental investigation (2005, background): “Day et al. (2003b) suggest that areas of low resource availability in patchy environments may provide refuges from strong competition because they support both low root biomass, and low above-ground biomass.”
Root competition: beyond resource depletion (2006, background): “Canopy gaps can provide niches for poor root competitors (Cahill & Casper 2003) and nutrient-poor patches of soil may also be places that allow poor competitors to survive (Day et al. 2003a).”
Performance of a clonal species in patchy environments: effects of environmental context on yield at local and whole-plant scales (2007, unknown): “Thus, heterogeneity is a potentially important determinant of the outcome of species interactions (e.g., Day et al. 2003) and of community composition (Hutchings et al. 2003; Wijesinghe et al. 2005).”