Leaf decomposition at temporary water area in Satoyama forest

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K00652
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental and ecological symbiosis
• Research Institution: Kindai University
• Principal Investigator: Kochi Kaori 近畿大学, 農学部, 講師 (50423984)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 水生昆虫 / 細流 / 落葉分解速度 / 源流部 / 有機物分解

Outline of Final Research Achievements

Leaves,flowers and other plant litter are important food and habitat resources for stream organisms where riparian forests cover stream water column. In river head, temporary water area、namely terrestrial and aquatic environment appears alternately is observed. This study investigated leaf litter decomposition and associated macro-invertebrates in the temporary water area. Bacterial community associated with the leaves on soil, in steam and other different conditions were estimated using a next generation sequencer. Under four different conditions, decomposition rate was fastest in the stream throughout the experimental period. Bacterial community (order) were similar between leaves on soil and wet soil.

Free Research Field

河川生態学

Academic Significance and Societal Importance of the Research Achievements

森林は世界の陸上面積の約 3 割を占める最も一般的なバイオームで,その一次生産のうちの9 割が腐食連鎖に移行する。日本国内には広く温帯林が分布しており,森林上部から落下する落葉や落枝(リター)量は多い。森林を流れる河川最上流部の細流は、降雨の影響を受け同じ場所が陸域や水域に変化する一時的水域である。このような場所での落葉に分解に関する知見は乏しい状況下で、開発や人工構造物の設置が行われていることが多い。本研究は森林内の一時的水域における落葉の分解速度と分解に関わる生物、およびバクテリア叢を明らかにし、河川最上流部の有機物分解のシステムの解明の一端を担った。