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J. Jpn. Soc. Soil Phys.
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No. 3,, p. -+ -3 ,**-

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Studies on Acid Sulfate Soils from a Biological Perspective
Kaoru UENO*, Tadashi ADACHI** and Hajime NARIOKA*** The Graduate School of Natural Science and Technology, Okayama University,-ῌ+ῌ+ Tsushima-naka, Okayama 1**ῌ2/-*, Japan** Faculty of Environmental Science and Technology, Okayama University,-ῌ+ῌ+ Tsushima-naka, Okayama 1**ῌ2/-*, Japan
Abstract
Acid sulfate soils are one of the problem soils worldwide, and are found mainly in the tropicalmangrove forests and mangrove swamps of Southeast Asia and Africa. Together, these areas
account for about +, million hectares of acid sulfate soils. But there is a shortage of arable landsin these areas, hence, acid sulfate soils are studied for agricultural purposes.

While many studies

have already made clear the mechanism of soil acidiﬁcation, it is still unclear how bacterial
actions are inﬂuenced by soil physical conditions. Additionally, clarifying the mechanism ofchanges in iron formation, leading to the development of acid sulfate soils may contribute to theunderstanding of the phenomenon. Studies on changes in iron formation in paddy soils, forexample, could become an interesting research area in soil physics.

This research area requires

interdisciplinary collaboration and has good possibilities of advancing. Likewise, other bacterial
studies in croplands will greatly supplement studies in acid sulfate soils.
In this paper, a number of studies on acid sulfate soils conducted in Japan and other countries
are introduced and possible research areas in the future are identiﬁed.
Key words : acid sulfate soils, acidity, bacteria, soil moisture, soil physics

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