Relationships between nitrogen in mineral associated organic matter and nitrogen retention of forest soils

Research Project

Project/Area Number	26450196
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Forest science
Research Institution	Okayama University
Principal Investigator	Hirobe Muneto 岡山大学, 環境生命科学研究科, 教授 (20363575)
Co-Investigator(Renkei-kenkyūsha)	Hyodo Fujio 岡山大学, 異分野融合先端研究コア, 准教授 (70435535)
Project Period (FY)	2014-04-01 – 2018-03-31
Project Status	Completed (Fiscal Year 2017)
Budget Amount *help	¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000) Fiscal Year 2017: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000) Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000) Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000) Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords	森林土壌 / 窒素保持 / 土壌の窒素代謝
Outline of Final Research Achievements	We tried to understand nitrogen (N) retention of forest soils, focusing on N in mineral associated organic matter (MAOM). In the experiment, we also tried to consider the topographic variations in soil N transformations. In the examined two forest stands, the results of N-15 addition incubation suggested that N over fine mineral particles (silt and clay) did not related to N retention, and that lower C/N ratio of MAOM indicated lower N retention. Further research in many forest types is needed for generalization.