Japanese Journal of Forest Environment
Online ISSN : 2189-6275
Print ISSN : 0388-8673
ISSN-L : 0388-8673
A few years alteration of soil physical and chemical properties in the volcanic ejecta and buried soil by the 2011 eruption of Mt. Shinmoe
Shigehiro IshizukaMasahiro InagakiTatsuya TsuritaAkihiro ImayaShiho Asano
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2015 Volume 57 Issue 1 Pages 19-31

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Abstract

We investigated the changes in soil physical and chemical properties at five plots, approximately 3 km apart from Mt. Shinmoe, with the volcanic ejecta and buried soil from a half year to one and a half year elapsed time from 2011 eruption of Mt. Shinmoe. The volcanic ejecta were composed by thin volcanic ash and thick pumice layer. The water-extractable ions and sulfur content in the volcanic ejecta were relatively smaller than those in the previous reports with other volcanos. The sulfate and ammonium were dominant for the water-soluble fraction. The clay content increased along with the time in any layer, indicating that clay migration had occurred. The thickness of the layer, total carbon and nitrogen content, cation exchangeable capacity and exchangeable cation content little fluctuate during this period. The sulfate and ammonium ion in the water-soluble fraction, sulfur content, and available phosphate seemed to decrease gradually, but the trend is obscure. Although the ejecta did not absorb phosphate up to 1 year after eruption, the ejecta one and half year after eruption was slightly able to absorb phosphate accompanying the increase in oxalate-extractable aluminum and Alp/Alo ratio. With regard to the nutrient load to the soil, because the contribution from thick pumice layer was greater than that from thin fine ash layer, we suggest that the contribution from pumice layer could be more important in the long-term change.

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© 2015 The Japanese Society of Forest Environment
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