御蔵島の台風崩壊地の植生回復における外来牧草播種の影響

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  • Influence of seeding exotic pasture grasses on the vegetation recovery of landslide slopes formed by typhoon 9512 in Mikura-jima Island, Izu Islands, Japan
  • ミクラジマ ノ タイフウ ホウカイチ ノ ショクセイ カイフク ニ オケル ガイライ ボクソウ ハシュ ノ エイキョウ

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In the research area (Torino-o No. 3 landslide slope), exotic pasture grasses (Agrostis stolonifera, Festuca sp., and Lespedeza cuneata) were seeded by helicopter, after locality-certified seedlings of native species (Alnus sieboldiana and Miscanthus condensatus) had been planted for vegetation recovery. We set four fertilized plots (approximately 200 kg/10 a of manure with fowl dropping) and three non-fertilized plots in 2004, and surveyed the vegetation in every summer, from 2004 to 2009. As a result, planted seedlings grew steadily whether fertilized or not, while a phenomenon like self-thinning was observed in A. sieboldiana and the maximum plant height was observed in M. condensatus in 2008. Exotic pasture grasses decreased gradually as a whole, but still remained around 10 % in coverage. Correlation with the total percentage of coverage in exotic pasture grasses was significant only in the annual changes in the number of trees per area in the year after fertilizing. In the fertilized plots, growth of A. sieboldiana, M. condensatus and Festuca sp. increased significantly only in the year after fertilizing. Fertilizing also influenced the life forms of invaded native species and species diversity in the her-baceous layer in an early few years, however it was not suggested that the influence delay the plant community succession on a medium to long term.

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