Journal of Forest and Environmental Science

Institute of Forest Science, kangwon National University (강원대학교 산림과학연구소)
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Influence of Spatial Differences in Volcanic Activity on Vegetation Succession and Surface Erosion on the Slope of Sakurajima Volcano, Japan

  • Teramoto, Yukiyoshi (Faculty of Agriculture, Kagoshima University) ;
  • Shimokawa, Etsuro (Faculty of Agriculture, Kagoshima University) ;
  • Ezaki, Tsugio (Faculty of Agriculture, Ehime University) ;
  • Nam, Sooyoun (Department of Forest Restoration, National Institute of Forest Science) ;
  • Jang, Su-Jin (Division of Forest Sciences, Kangwon National University) ;
  • Kim, Suk-Woo (Division of Forest Sciences, Kangwon National University) ;
  • Chun, Kun-Woo (Division of Forest Sciences, Kangwon National University)
  • Received : 2017.02.14
  • Accepted : 2017.05.13
  • Published : 2017.05.31
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Abstract

We selected 6 plots ($100m^2$) located 2.2-3.8 km from Minamidake Crater on the north flank of Sakurajima Volcano. We conducted a field study to investigate the effects of volcanic activity on vegetation succession and surface erosion rate. The results showed that trees growing in plots further from the crater had a greater diameter at breast height (DBH), total height, and age. In addition, these plots had a greater number of woody plants and species, as well as a greater total cross-sectional area at breast height. The Fisher-Williams index of diversity (${\alpha}$) and the proportion of evergreen broad-leaved trees were higher in plots located further from the crater. Vegetation succession in these plots was not at the level of a climax forest. From 1972 to 2015, the timing for active volcano, the depth of volcanic ash layer, the dry density, and the pH of ground surface were lower for plots located further from the crater. Furthermore, the average annual sheet erosion from 1972 to 2015 was also lower for plots located further away from the crater. Overall, plots further away from the crater have a better environment for vegetation growth and a lower dry density of the volcanic ash surface layer. It is thought that lower dry density results in increased soil permeability, which impedes surface flow. In order to prevent debris-flow disasters, caused by mud and rock flow resulting from impaired soil penetrability, it is essential to promote soil development and restore penetrability by artificial vegetation restoration.

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