Development of hybrid model for a long-term simulation of nitrogen saturation in forested ecosystems

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K14756
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Forest science
• Research Institution: Kyoto University
• Principal Investigator: Ohte Nobuhito 京都大学, 情報学研究科, 教授 (10233199)
• Co-Investigator(Kenkyū-buntansha): 磯部 一夫 東京大学, 大学院農学生命科学研究科(農学部), 助教 (30621833) ; 小山 里奈 京都大学, 情報学研究科, 准教授 (50378832) ; 徳地 直子 京都大学, フィールド科学教育研究センター, 教授 (60237071) ; Vincenot C.E. 京都大学, 情報学研究科, 助教 (80751908)
• Research Collaborator: GIANNINO Francesco フェデリコ2世・ナポリ大学, 農学・獣医学部, 研究員
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 窒素循環 / 窒素飽和 / 窒素流出 / NO3- / モデル / 安定同位体

Outline of Final Research Achievements

In order to understand the time sequential processes of nitrogen (N) saturation under heavy N deposition environment, and to make a long-term prediction of N saturation related phenomena, we developed a simulation model. For this model development, we made the meta-analysis on nitrogen transformation data (mineralization and nitrification) to identify critical controlling factors, which were developed from the nation wide-survey for the forest soils. Based on those data, we developed a numerical simulation model of N cycle dynamics in forest ecosystem using a system dynamics technique. We executed long-term simulations (102 years order), and reproduced the time lag between starting of heavy N deposition and response of the NO3- pool size growth. This time lag was explained by the retention capability with the microbial N recycle mechanisms.

Free Research Field

生態系生態学