Whether ester sulfate is incorporated into the aluminum humus complex in the soil?

2014 Fiscal Year Final Research Report

• Project/Area Number: 24580096
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Plant nutrition/Soil science
• Research Institution: Forestry and Forest Products Research Institute
• Principal Investigator: TANIKAWA Toko 独立行政法人森林総合研究所, 関西支所, 主任研究員 (10353765)
• Co-Investigator(Kenkyū-buntansha): HASHIMOTO Yohey 東京農工大学, (連合)農学研究科, 准教授 (80436899)
• Co-Investigator(Renkei-kenkyūsha): WAGAI Rota 独立行政法人農業環境技術研究所, 主任研究員 (80456748) ; KANDA Kazuhiro 兵庫県立大学, 高度産業科学技術研究所, 教授 (20201452) ; KURODA Katsushi 独立行政法人森林総合研究所, 主任研究員 (90399379)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: イオウ化合物 / 蓄積機構 / アルミニウム遊離酸化物 / 鉄遊離酸化物 / エステル硫酸 / 森林土壌

Outline of Final Research Achievements

In the present study, we hypothesized that the inhibition of ester sulfate-S mineralization was caused by higher contents of active Al ions in forest soils which might leads to the stabilization of ester sulfate-S incorporated into Al-humus complexes. For this aim, we conducted comprehensive analytic approaches combining with soil incubation, sequential density fractionation, XAFS and SEM-EDX measurements. The peak line in both lighter/heavier fractions of ester sulfate-S in the soils after the incubation treatment seemed slightly extended compared with those before the incubation treatment. However, the order of the ester sulfate-S concentration in these fractions was not clear in the spectra. In the SEM-EDX point analysis, both of the sulfur concentration and aluminum concentrations varied widely at measurement points. To verify　the hypothesis, further investigations about/on the possibility of uneven ester sulfate-S distribution by soil particles would be needed.

Free Research Field

森林土壌学