| 要旨トップ | 目次 | | 日本生態学会第73回全国大会 (2026年3月、京都) 講演要旨 ESJ73 Abstract

一般講演（口頭発表） H02-07 （Oral presentation）

#### Exploring Soil Microbial and Environmental Drivers of Carbon Emissions in Korean Temperate Forests【E】

*Amna SAHER, Doy KIM, Yowhan SON（Korea Univ.）

This study investigated the impact of forest stand types and monthly variations on soil carbon fluxes (CO2, CH4), with a focus on soil microbial activity and key environmental drivers in the urban forests of Seoul, South Korea. From May to December 2024, CO2 efflux and CH4 uptake were measured using closed-static chambers once a month between 10 am and 2 pm in three urban forest stands: Prunus yedoensis (PY, deciduous broad-leaved), Pinus koraiensis (PK, evergreen coniferous) and Metasequoia glyptostroboides (MS, deciduous coniferous). Simultaneously, soil temperature (ST) and moisture (SM) were monitored. Additionally, topsoil at a depth of 0-10 cm was sampled to assess soil microbial biomass carbon (MBC) and nitrogen (MBN), and soil extracellular enzyme activities of β-glucosidase (BG), cellobiohydrolase (CBD), β-xylosidase (BX), and N-acetylglucosaminidase (NAG). The mean CO2 efflux during the study period was 499 ± 71 mg C m-² h-¹ in PY, 296 ± 38 mg C m-² h-¹ in PK, and 229 ± 29 mg C m-² h-¹ in MS, respectively. CO2 efflux was significantly influenced by both forest stand type and the sampling month (p < 0.001), with PY showing higher efflux than both PK and MS. Moreover, CO2 efflux was highest in July across all forest stands (p < 0.001). The high ST in July enhanced soil microbial activity, as shown by the strongest positive correlation between CO2 efflux and ST (R2 = 0.87; p < 0.001) along with the strong positive correlations with MBC (R2 = 0.73; p < 0.001), MBN (R2 = 0.65; p < 0.01), BX (R2 = 0.78; p < 0.001), CBD (R2 = 0.86; p < 0.001), and BG (R2 = 0.90; p < 0.001). Regarding CH4, uptake was observed across all forest stands, with PY showing 40% greater uptake than PK, and 28.5% more than MS (p < 0.05). CH4 uptake was significantly impacted by the sampling month (p < 0.001) and higher ST led to stronger CH4 uptake (R2 = 0.61; p < 0.001). Additionally, CH4 uptake showed a moderate positive correlation with soil microbial activities (R2 > 0.51; p < 0.05). Forest stands and sampling months significantly impacted carbon fluxes, with the greatest increase observed in PY in July, influenced mainly by the ST and microbial activities. Long-term monitoring is needed to determine how species-driven soil chemistry effects on carbon fluxes respond to seasonal and interannual climate variability.

日本生態学会