IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 208 Poster Session / Soil Organic Matter, Caustobiolites, and Biochar Hall A correlations revealed clear partitioning along the soil–water gradient: water level independently governed CH4 in uncovered peat (ρn = 0.59, p < 0.01), while temperature drove CO2 under deeper cover (ρn = 0.27–0.37, p < 0.05). Integrating pedology, hydrology and aquatic carbon biogeochemistry into a three-axis framework (water table × temperature × cover depth), thin mineral cover emerges as the optimal management option for protecting peat humic substances, stabilizing the soil– water interface, and minimizing GHG export. Keywords: Peatland; Soil–water interface; Greenhouse gas; Groundwater dynamics; Humic substances; Aquatic carbon cycling References 1. B. Kløve, P. Ala-aho, G. Bertrand, et al., Science of the Total Environment 605–606 (2017) 658. 2. H. Guo, S. Cui, C.K. Nielsen, L. Tang, L. Pugliese, S. Wu, Environmental Science & Technology 59 (2025) 6521. 3. M. Albert-Saiz, M. Lamentowicz, A. Rastogi, R. Juszczak, Catena 257 (2025) 109123. 4. IPCC, in Climate Change 2021: The Physical Science Basis, V. Masson-Delmotte, P. Zhai, A. Pirani, et al. (Eds.), Cambridge University Press, Cambridge, 2021, p. 923. Acknowledgement The authors gratefully acknowledge the Water Resources Planning Branch, Water Resources Agency, Ministry of Economic Affairs, Taiwan, for funding and data support under project no. MOEAWRA1140254.
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