Journal of the Japanese Forest Society
Online ISSN : 1882-398X
Print ISSN : 1349-8509
ISSN-L : 1349-8509
Articles
Mortality of Pinus densiflora One Year after the 2011 Shinmoe-dake Eruption in the Kirishima Mountains of Kagoshima Prefecture
Seiichi KanetaniMasashi HigashiYosuke UsuiEriko KawaguchiHiromi YamagawaMitsuteru AkibaShiho Asano
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2013 Volume 95 Issue 5 Pages 253-258

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Abstract
To evaluate the effect of volcanic ash deposits and pine wilt disease on Pinus densiflora mortality in the Kirishima Mountains one year after the 2011 Shinmoe-dake eruption, we investigated the mortality rate in 84 P. densiflora forest stands and measured the depth of volcanic ash deposits from the 2011 eruption in those stands and around 117 dead P. densiflora trees which were examined for the presence of Bursaphelenchus xylophilus. Although mortality rate was less than 20% in stands with volcanic ash depths shallower than 20 cm, it ranged from 60 to 100% in three stands along a hiking trail located at altitudes above 1,000 m where the volcanic ash stood depths were deeper than 25 cm. B. xylophilus was not detected in any dead P. densiflora tree sampled along the hiking trail, but was found in 86 dead trees below c.a. 950 m where the volcanic ash deposits were shallow. This evidence indicated that heavy volcanic ash deposits might cause extensive damage to P. densiflora without pine wilt disease. But some dead P. densiflora trees infected by pine wilt disease were found around the damaged P. densiflora forests where the forest floor was covered by a deep layer of volcanic ash. The results suggested the importance of controlling pine wilt disease in the region to preserve the surviving P. densiflora trees as a seed source for natural regeneration of P. densiflora forests damaged by the 2011 Shinmoe-dake eruption.
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© 2013 The Japanese Forest Society
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