草地の雑草管理に関する研究 : III.エゾノギシギシ侵入草地におけるオーチャードグラス個体の減少過程

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The decrease in the population density of orchardgrass (Dactylis glomerata L. 'Aonami') in a sward infested with broadleaf-dock (Rumex obtusifolius L.) was investigated from the view point of pasture productivity, distribution pattern of the plants expressed by MORISHITA'S Iδ-index, and competition among adjoining plants determined by Voronoi polygons, during the period from September, 1985 to October, 1987. The results obtained are as follows : 1 . In the sward heavily infested with broadleaf-dock, the yield of broadleaf-dock increased and the density of orchardgrass decreased with the lapse of time. Orchardgrass showed a contagious distribution, whereas broadleaf-dock showed a uniform distribution with a narrow spacing, and it became dominant over a wide area by suppressing orchardgrass growth (Tables 1, 2 and 3, Fig.1). 2 . The negative correlation of yield (dry matter weight) between adjoining broadleaf-dock and orchardgrass plants suggested the existence of interspecific competition. The positive correlation of yield between adjoining plants of either orchardgrass or broadleaf-dock, respectively suggested the existence of a low competitive relation between conspecific plant individuals (Table 4) . 3 . Orchardgrass and broadleaf-dock plants with a light weight readily died. Orchardgrass plants surrounded by a large number of adjoining plants also tended to die. Only orchardgrass plants surrounded by a large number of adjoining plants (orchardgrass or broadleaf-dock) with a light weight were able to survive (Fig.2, Table 5).
日本雑草学会の論文
1988-12-26

草地の雑草管理に関する研究 : III.エゾノギシギシ侵入草地におけるオーチャードグラス個体の減少過程

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