In Cactaceae, the interception of photosynthetic active radiation (PAR) differs among opposite sides of the stem, determining the availability of resources for reproduction, since it has been suggested that there is no translocation of resources between ribs. It has been shown that the production of reproductive structures in columnar cacti...
This work was made to study the influence of different factors as density (high and low), spatial patterns of distribution (clumped and random) and species composition on survival and growth rates, intensity of competition and finally on the biomass production, under controlled experimental conditions. Two annual plants species from the...