An Evaluation on contribution of organo-metal complexes to enhanced soil CO release during drying-rewetting cycles using buried humic horizon soils

乾燥・湿潤サイクルにおける土壌CO放出増加への有機-金属複合体の寄与; 地表と埋没した有機層土壌を用いた評価

鈴木 優里*; 平舘 俊太郎*; 小嵐 淳   ; 安藤 麻里子  ; 鈴木 一輝*; 中山 理智*; 阿部 有希子*; 彦坂 幸毅*; 梶野 浩史*; 佐瀬 裕之*; 浦川 梨恵子*; 永野 博彦*

Suzuki, Yuri*; Hiradate, Shuntaro*; Koarashi, Jun; Atarashi-Andoh, Mariko; Suzuki, Kazuki*; Nakayama, Masataka*; Abe, Yukiko*; Hikosaka, Koki*; Kajino, Hirofumi*; Sase, Hiroyuki*; Urakawa, Rieko*; Nagano, Hirohiko*

Global warming is changing precipitation patterns, leading to more intense drying-rewetting cycles (DWCs) and impacting soil carbon (C). While microbially-derived C is traditionally considered the primary CO source during DWCs, C released from organo-metal complexes is increasingly recognized as significant. This study investigated the role of these complexes in DWC-induced CO release using soils with contrasting complex concentrations and microbial biomass. DWCs consistently increased CO release, with buried soils showing a much larger increase than surface soils. Changes in bacterial/archaeal and fungal communities due to DWCs were also observed. These findings suggest organo-metal complexes are key C sources during DWCs, potentially influencing soil microbial communities.