Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS14] Biogeochemistry

Wed. May 23, 2018 10:45 AM - 12:15 PM 101 (1F International Conference Hall, Makuhari Messe)

convener:Keisuke Koba(Center for Ecological Research, Kyoto University), Hideaki Shibata(Field Science Center fot Northern Biosphere, Hokkaido University), Naohiko Ohkouchi(海洋研究開発機構, 共同), Youhei Yamashita(Faculty of Environmental Earth Science, Hokkaido University), Chairperson:Nishina Kazuya, Shibata Hideaki(北海道大学北方生物圏フィールド科学センター)

11:15 AM - 11:30 AM

[MIS14-09] Initial soil formation on fresh volcanic ash from the 2000 eruption of Miyake Island

*Maki Asano1, XINXIN LI1, Kenji Tamura1, Takashi Kamijyo1, Rota Wagai2, Yasuo Takeichi3, Kanta Ono3, Yoshio Takahashi4 (1.University of Tsukuba, 2.NARO, 3.KEK, 4.The University of Tokyo)

Keywords:Initial soil formation, primary succsession, organo-mineral interaction, soil organic matter, volcanic ash soil, Miyake Island

Mt. Oyama in Miyake Island erupted with large amounts of volcanic ash in 2000. Large areas of the island were severely damaged by the volcanic ash, debris flow and volcanic gas. The areas from the mountain top (new crater) to mountain side on western part of the Island (Igaya area) were buried by thick volcanic ash deposition followed by primary succession of plant-soil system. The research on the initial soil forming process on fresh volcanic ash under natural environment is important to understand the development of volcanic ash soil (Andosols) and ecosystem in volcanic region. Co-variation between vegetation growth and accumulation of organic matter is especially important. We conducted soil profile investigation and sampling in the vegetation monitoring sites at Igaya area in 2007, 2011, 2015 and 2017. We examined the changes in the soil profile morphology and soil physico-chemical properties in the time series. Organo-mineral particle was separated by the combination of density and particle size fractionation and the recovered fractions were observed by scanning transmission X-ray microscopy (STXM) and near-edge X-ray absorption fine structure (NEXAFS). We will discuss on the concurrent development of soil-vegetation system and the accumulation of soil organic matter in the initial soil formation.