Analysis of Frequency and Density Effects on Growth in Mixtures of Salvia Splendens and Linum Grandiflorum Using Hexagonal Fan Designs

摘要: (1) The use of hexagonal fan designs as an efficient method for the analysis frequency and density effects on growth survival in two-component mixtures is illustrated greenhouse experiments with annual cultivars Salvia splendens Linum grandiflorum. (2) Density had a large effect vegetative reproductive weight Salvia, but lower Linum. These were consistent dwarf, large-broad-leaved habit tall, small-narrow-leaved Reproductive effort declined increasing increased (3) There complex interactions, at low densities being affected by higher high At densities, tended to give yields frequencies, frequencies than monocultures. (4) responses mixed generally pure fans, or stands fixed density, although there was evidence that results fans could not solely be accounted nearest-neighbour effects. (5) Data from such used construct replacement series graphs, density-frequency response surfaces, examine population regulation two-species using graphs given different initial numbers two components. Complex patterns revealed did fit expectations simple competition models. (6) Hexagonal provided approximately four-fold economy seeds nearly ten-fold space, compared separate plots providing same range densities. However, are considerable statistical problems associated designs. Nevertheless, they promise important exploratory tool examination yield mixtures.