Mitigating greenhouse gas emissions of a managed organic soil by paddy rice cultivation in the cool temperate zone

作者：A. Widmer, Lisa Tamagni, Chloé Wüst‐Galley, Sonja Paul, Markus Jocher, Valerio Volpe, Sebastian Döetterl, Thomas Keller, Jens Leifeld · 发表于：Agriculture Ecosystems & Environment · 年份：2025 · DOI：10.1016/j.agee.2025.110146 · 被引用次数：3 · 研究领域：Peatlands and Wetlands Ecology、Soil Carbon and Nitrogen Dynamics、Constructed Wetlands for Wastewater Treatment

Large areas of temperate peatlands are drained for agriculture and are strong sources of greenhouse gases (GHG). Paddy rice cultivation as a new cropping system in the cool temperate climate could offer an opportunity for continuing food production on these organic soils, possibly reducing carbon dioxide (CO 2 ) and nitrous oxide (N 2 O) emissions by rewetting. However, methane (CH 4 ) from paddy rice cultivation might impair the potential climate benefits. Here, the GHG fluxes of CO 2 , CH 4 , and N 2 O of paddy rice grown on organic soil with and without amended mineral cover, as well as in ley cultivated on drained organic soil as a reference, were quantified in an outdoor mesocosm experiment in Switzerland (cool temperate climate). Measurements were conducted with manual chambers for one year. Compared to ley under drained management, paddy rice cultivation reduced the net GHG balance by 36.1 %, from 32.7 (7.0) to 20.9 (2.7) t CO 2 eq ha −1 yr −1 . The GHG balance was dominated by CO 2 whereas CH 4 accounted for 8 % (54.3 (26.2) kg CH 4 ha −1 yr −1 ). Most CO 2 emissions occurred during the drained fallow period (mid-September–April). N 2 O emissions (0.9 (0.4) kg N 2 O-N ha −1 yr −1 ) were reduced by 83.9 % with paddy rice. Adding an amended mineral cover to organic soil slightly reduced the net GHG balance further, but not significantly. Multi-year studies on field-scale are required to generalize this study’s findings derived from a one-year mesocosm experiment. The re...