Abstract
Taraxacum officinala andTaraxacum laevigatum were grown in mixed stands at various plant densities and mixing ratios with various levels of soil moisture to formulate the effect of soil moisture on the competitive relationship between the species. In pure stands, the mean plant weight—plant density relation for each level of soil moisture could be described by the reciprocal equation of the crowding effect. On the other hand, the response of mean plant weight to soil moisture content followed the reciprocal equation for a repulsive growth factor at the respective levels of plant density. By introducing the density conversion factor, the results of mixed stands could be successfully formulated from similar reciprocal equations. The dependence of density conversion factor on soil moisture content was also formulated. From these relations, a comprehensive formula was developed to describe the effects of plant density and soil moisture content on the growth of two species in mixed stands. Changes in the biomass in mixed stands were, examined by means of calculations based on the experimental results.
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