Forest ecosystem cycle analysis of radionuclide in organic and mineral soil

2014 Fiscal Year Final Research Report

• Project/Area Number: 24380076
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Forest science
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: TODA Hiroto 東京農工大学, (連合)農学研究科(研究院), 教授 (00237091)
• Co-Investigator(Kenkyū-buntansha): GOMI Takashi 東京農工大学, 大学院農学研究院, 准教授 (30378921) ; ISHIKAWA Yoshiharu 東京農工大学, 大学院農学研究院, 教授 (70285245) ; CHOI DonSu 東京農工大学, 大学院農学研究院, 准教授 (20451982) ; YOSHIDA Tomohiro 東京農工大学, 農学部, 助教 (60521052)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 放射性セシウム動態 / 落葉の移動と分解 / 土壌有機物の浸透 / 土壌有機物の詳細画分 / 森林小流域 / ホットスポット / 萌芽更新 / 渓床堆積物

Outline of Final Research Achievements

Radioactive cesium transport and accumulation were influenced by litter layer dynamics in forest ecosystems. Most of the radioactive cesium was kept in decomposed organic and very thin surface layers. On the steep slope and small vegetation cover sites, radioactive cesium were decreased faster compared with natural decrease rate because of erosion of litter and surface soil. On the bottom of slope and gentle slope of ridge, hot spots were found. The radioactive cesium ratio of vegetation to surface soil were greater in the oak regeneration site than in the abandoned cultivated land. It was suggested that the oak sprouts uptake more radioactive cesium from surface soil. The radioactive cesium in streams come from litter and soil of forest floor. And most of them flowed away with particulate matter. We have to continue research to clarify radioactive cesium dynamics in forested watershed ecosystems.

Free Research Field

森林生態学、森林立地学