Elcidation of controlling factors of soil nitrite dynamics by incubation experiments under model environment

• Project/Area Number: 15H06621
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Forest science
• Research Institution: Chuo University
• Principal Investigator: Kuroiwa Megumi 中央大学, 理工学部, 助教 (00761024)
• Project Period (FY): 2015-08-28 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 森林土壌 / 亜硝酸 / 15Nトレーサー / 亜酸化窒素 / 硝化 / 窒素循環

Outline of Final Research Achievements

We incubated 3 soils that has gradient of NO2- production rate at 3 gravimetric water content (20, 32.5, 45%) to elucidate the controlling factors of NO2- transformation rates and processes. NO2- production rates changed in conjunction with NO2- consumption rates thorough the incubation period. Water content partially explained the differences in NO2- production and consumption rates. It is suggested that N2O production was regulated by NO2- oxidation (NO3- production) potential. While abiotic NO2- production was not observed, abiotic NO2- consumption was significant. N2O production from autoclaved soil accounted for 7.1-41% of one from non-autoclaved soil, indicating significant contribution of abiotic N2O production in some case.