Influence of Grazing Cattle on Survival and Growth of Cryptomeria japonica D. Don Seedlings in a Sasa kurilensis Makino et Shibata-predominated Forest Floor of a Beech Forest

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  • Fukuda Eiki
    National Agricultural Research Center for Tohoku Region
  • Suyama Tetsuo
    National Agricultural Research Center for Tohoku Region
  • Shibuya Yukinori
    National Agricultural Research Center for Tohoku Region
  • Yagi Takanori
    National Agricultural Research Center for Tohoku Region:(Present office)National Agricultural Research Center for Hokkaido Region
  • Meguro Ryohei
    National Agricultural Research Center for Tohoku Region

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  • 放牧牛がブナ林内ササ植生中のスギ稚樹の生残と生育に及ぼす影響
  • ホウボクギュウ ガ ブナリン ナイ ササショクセイ チュウ ノ スギチジュ ノ セイザン ト セイイク ニ オヨボス エイキョウ

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Abstract

This study investigated the influence of grazing cattle on the survival and growth of Japanese cedar (Cryptomeria japonica D. Don) seedlings in a sasa-type forest floor of a Fagus crenata Bl. forest. We compared the height and coverage of Sasa kurilensis and the survival rate, height, and photoenvironment of cedar seedlings between grazed and excluded plots in a gap of the beech forest including an artificial cedar stand for five years. In the excluded plots, S. kurilensis rapidly increased in height and coverage, and the relative photon flux density decreased, resulting in a decrease in the cedar seedlings survival rate in the third year. On the other hand, in the grazed plots, cattle frequently grazed S. kurilensis and, thus, a good photoenvironment was maintained, which resulted in a significantly higher survival rate and height of the seedlings as compared to those in the excluded plots. Cattle rarely influenced cedar seedlings directly by grazing, trampling and excreting behaviors. We can term grazing cattle as a "selective biological disturbance factor" for S. kurilensis because it acted as a disturbance factor for S. kurilensis but not for cedar seedlings. Therefore, it is concluded that the success or failure of cedar regeneration depends on cattle grazing pressure in the S. kurilensis-type forest floor of a beech forest.

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