The effect of climate and grazing interaction on plant-plant
relations
We
found significant effects of both grazing and aridity on the outcome of
plant-plant interactions, expressed by the RII indices. In particular,
the RII indices for species richness, abundances, and Shannon diversity
were all positive in high aridity/high grazing conditions. The RII
values were neutral (i.e. not significantly different from zero) for
species richness and Shannon diversity in the low aridity/low grazing
conditions and also for Shannon diversity in the low aridity/high
grazing and even negative for RII-cover in low aridity/low grazing
regime (Table 2).