Growth of Japanese Black Pine Forest and Water Infiltration Rates on the Lava Flows of Sakurajima Volcano, Japan

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  • 桜島の溶岩上におけるクロマツ林の成長と土壌浸透能
  • サクラジマ ノ ヨウガン ジョウ ニ オケル クロマツリン ノ セイチョウ ト ドジョウ シントウノウ

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<p>  From 2000 until 2004, Japanese black pine growing on Sakurajima Volcano has been devastated by pine wilt disease. Most of the pines on the Taisho and Showa lava flows suffered high mortality rates after being invaded by pine wilt disease starting in 2004. We investigated a relationship between the growth of Japanese black pine forest, and the surrounding environment and water infiltration rates into soil of Japanese black pine forest after this invasion and the associated morality. We installed vegetation survey plots in the areas covered by the Taisho and Showa lava flows, which erupted from Sakurajima Volcano in 1914 and 1946, respectively, and conducted field surveys in 2013. In the study plots, for trees with the same diameter at breast height, pines on the Taisho lava flow grew taller than pines on the Showa lava flow; also, the pines on the Taisho lava flow grew faster and with a larger amount of diameter growth than pines on the Showa lava flow. In the study plots, the development of forest soil on the Taisho lava flow was better than that on the Showa lava flow because the Taisho lava flow has a better growth environment for pine, and therefore the water infiltration rate on the Taisho lava flow was larger than that on the Showa lava flow.</p>

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