Sulfur content in Japanese forest soils
2004
Tanikawa, T. (Forestry and Forest Products Research Inst., Kyoto (Japan). Kansai Research Center) | Takahashi, M. | Imaya, A.
Abstract We studied the content in Japanese forest soils of sulfur (S) fractions and their percentages to total S content. Organic S constituted a large proportion of the total S in A horizons, however, the relative importance of inorganic S increased below B horizons. The most dominant form of S was found to be hydriodic acid-reducible S (HI-reducible S), whose content levels at depths of 0-1 m ranged from 350 to 4710 kg S ha-1. The mean ratio of HI-reducible S, carbon-bonded S (C-bonded S) and PO4-extractable S in Andisols was 53 : 18 : 29 , and that in Inceptisols was 40 : 30 : 30 . Japanese forest soils are likely to have active mechanisms that retain HI-reducible S. In general, HI-reducible S is considered to be a labile fraction of soil organic S. It is important to confirm that HI-reducible S is a stable compound in Japanese forest soils in order to estimate the response of the soils to changing atmospheric S or nitrogen inputs.
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