The effect of the priming effect to soil carbon dynamics by organic fertilization

2017 Fiscal Year Final Research Report

• Project/Area Number: 26850039
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Plant nutrition/Soil science
• Research Institution: The University of Tokyo
• Principal Investigator: Hayakawa Chie 東京大学, 大学院農学生命科学研究科(農学部), 特別研究員 (10725526)
• Research Collaborator: Fujii Kazumichi 森林総合研究所, 立地環境研究領域, 主任研究員 (60594265) ; Senoo Keishi 東京大学, 農学生命科学研究科, 教授 (40206652) ; Inagaki Yoshiyuki 森林総合研究所, 四国支所, 主任研究員 (00353590) ; Isobe Kazuo 東京大学, 農学生命科学研究科, 助教 (30621833)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: プライミング効果 / 火山灰土壌 / 埋没腐植層 / 炭素貯留 / 同位体トレーサー法 / 土壌微生物

Outline of Final Research Achievements

This study aimed to reveal the factors regulating the priming effect of volcanic ash soils in Hokkaido, in order to estimate the soil carbon dynamics including the priming effect. Using the 13C tracer incubation experiment, the priming effects in the volcanic ash soils were quantified and the threshold value of the added labile organic matter to induce the priming effect was revealed. The added substrate type, soil pH and the amount of soil inorganic nitrogen contributed to the size and term of priming effects. In addition to fungi which were reported as the driver of the priming effects, bacteria was also suggested to control the priming effects. According to the results, the functions by Michaelis-Menten fit were determined to estimate soil carbon dynamics including the priming effect.

Free Research Field

土壌学