Stability of aluminum-humic acid complex against microbial degradation

2016 Fiscal Year Final Research Report

• Project/Area Number: 26340005
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Yamaguchi University
• Principal Investigator: Yanagi Yukiko 山口大学, 創成科学研究科, 助教 (20412819)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 土壌有機物 / 腐植物質 / アルミニウム / 微生物 / 分解 / 炭素蓄積

Outline of Final Research Achievements

In this study, we conducted research aiming directly to evaluate the stability against the microbial degradation of aluminum (Al) - humus complexes using humic acid as a major fraction of humic substances and humic acid degrading fungi.
In the decolorization test under the coexistence of inorganic substances, no influence of inorganic substances was observed. In the decolorization test using the synthetic Al-humic acid complex, no influence was observed under the dissolved condition. However, under the decolorization test by the suspension culture, the Al-humic acid complex showed a high stability significantly. Furthermore, even in the model oxidative degradation test using hydrogen peroxide, the Al - humic acid complex showed high resistance to decomposition.
Consequently, it is contributed that the improvement of the chemical stability of humic substances by complex formation with Al as a cause of the stabilization mechanism of soil organic matter.

Free Research Field

土壌有機化学