Primary production estimation in lakes by the use of stable isotope and application to ecological modeling

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630223
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Hydraulic engineering
• Research Institution: Tohoku University
• Principal Investigator: Umeda Makoto 東北大学, 工学(系)研究科(研究院), 准教授 (10447138)
• Co-Investigator(Kenkyū-buntansha): NAKAGAWA Fumiko 名古屋大学, 大学院環境学研究科, 准教授 (70360899)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 湖沼環境

Outline of Final Research Achievements

In Lake Izunuma, which is highly eutrophicate, we conducted field measurements on the
dominant macrophyte of lotus (Nelumbo nucifera) in this lake with regard to seasonal biomass change and nutrient cycling. Based on those data, we developed a numerical model to analyze water quality and vegetation in the lake. By the use of triple oxygen isotopes of dissolved oxygen, gross primary production was estimated in a oligotrophic lake, Lake Shikotsu and Lake Kuttara, and in a mesotrophic lake, Lake Biwa. By the use of triple oxygen isotopes in nitrate nitrogen, new production rate was also estimated. By considering the difference between those factors, regeneration production was estimated.

Free Research Field

水工学