海岸風衝草地におけるタマテンツキの分布とそれを規制する要因

概要

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To clarify the possible mechanisms controlling the distribution of Fimbristylis cymosa subsp. umbellato-capitata (FCU) in the coastal windswept pasture, field experiments using protective cages at 0 m, 200 m, 300 m and 400 m from the cliff top were carried out in Yonaguni Island, Southwestern Japan. Ecological characteristics of FCU were investigated under different field conditions. Seedlings of FCU were cultivated in sand containing different amounts of NaCI under shading conditions in a greenhouse. In the field the mean clone size inside the enclosure was bigger than that outside. The size of the clones transplanted in the enclosures near the cliff top increased, but those inside and outside the enclosure located further from the cliff edge died. The growth of FCU cultivated in the greenhouse was suppressed at a high NaCl concentration ; however, the dry weight of unshaded plants increased. While under shaded conditions, plants scarcely grew even without addition of NaCl. FCU was distributed around the sea cliff with and without grazing use. However, in sheltered places where salt winds decline, the number of plant species increased and growth of FCU was suppressed by tall-growing Imperata cylindrica under protected, and by quickly expanding prostrate species e. g. Digltaria under grazed condition.
日本生態学会の論文
1991-12-31