草地の雑草管理に関する研究 : I. 雑草の発生が新播草地における牧草の個体密度および分布に及ぼす影響

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Population density and spatial distribution of orchardgrass in three newly established swards (orchardgrass sward with Rumex obtusifolius infestation, Digitaria ciliaris infestation and pure orchardgrass sward, free of weeds as control) were examined. Spatial distribution of orchard-grass was analyzed by means of Morishita's I_δ-index in the swards. Invasion of R, obtusifolius or D. ciliaris into the sward decreased both the yield and population density of orchardgrass (Table 1, 3), and due to weed infestation the spatial distribution of orchardgrass was contagious. On the other hand, in the weed-free sward, the spatial distribution was random (Fig. 1). From these results, it is suggested that the decrease in the density and the concentration in the distribution of the herbage population in newly established swards associated with weed infestation further promote the infestation of weeds, resulting in the decrease of the productivity of the swards which deteriorate earlier than under weed-free conditions.
日本雑草学会の論文
1987-05-26