温暖地の非相互作用下におけるススキ株の地際面積の上限

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タイトル別名
  • A MAXIMUM AREAL SIZE OF ISOLATED PATCHES OF MISCANTHUS SINENSIS ANDERSS. GROWING IN A WARM REGION
  • オンダンチ ノ ヒソウゴ サヨウ カ ニ オケル ススキカブ ノ チ サイ メンセキ ノ ジョウゲン

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From continuous observation over a ten year period of several clonal patches of Miscanthus sinensis in a warm region, Shizuoka Prefecture, it was confidently ascertained that the rate of enlargement of the patch size decreased with age, until it reached a maximum patcharea. A simulation based on the five patches mentioned above, together with additional observations of many other patches over a shorter period, showed that a patch which had reached about 90% of its maximum size (4300 cm2) had aged about thirteen years since its emergence as a seedling. Observations of the relative growth rate in a patch-area have elucidated that the tillering index, defined as the ratio of the number of shoots actually tillered to the number of tillering shoots that developed during the previous autumn, tended to decline in the peripheral shoot-population of a large patch. This seemed to be the primary cause of delay in the expansion of a large patch-area by sympodial branching of rhizomes. This delay was considered to occur naturally because of the accumulation of withered parts of a patch. In a M. sinensis patch, the descent in the tillering index resulting from its accumulation seemed to be unavoidable because of an insufficient cost for rhizome growth ; namely an extremely low ratio of rhizome length to shoot height (L/H ratio) and/or because of a lack of plasticity in rhizome branching ; namely a nearly fixed direction of the branching.

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