CH4 and N2O emissions increased following the conversion of aquaculture ponds to rice monoculture and rice–shrimp coculture fields in southeast China

作者：Mei Liu, Minpeng Hu, Dan Zhou, Songbao Zou, Yu Zhang, Bin He, Meng Ni, Julin Yuan · 发表于：Scientific Reports · 年份：2025 · DOI：10.1038/s41598-025-28979-3 · 被引用次数：1 · 研究领域：Agricultural Systems and Practices、Coastal wetland ecosystem dynamics、Innovations in Aquaponics and Hydroponics Systems

In recent years, numerous aquaculture ponds in southeast China have been transformed into rice paddies or rice–shrimp fields. This shift in land use can potentially alter the biogeochemical cycling of carbon and nitrogen, thereby influencing CH 4 and N 2 O emissions. However, the exact impacts and factors driving these changes remain unclear. Herein, a two-year field experiment was conducted to evaluate and compare CH 4 and N 2 O emissions from shrimp ponds (SP), alongside reclaimed rice monoculture (RM) and rice–shrimp coculture (RS) fields that were converted from shrimp ponds. The findings showed that converting aquacultural wetlands to RM significantly increased annual emissions, with CH 4 rising dramatically from 103 to 490 kg/(ha·yr) (a 375.7% increase) and N 2 O increasing from 4.22 to 7.39 kg/(ha·yr) (a 75.1% increase). However, further converting RM into RS notably reduced annual emissions, with CH 4 decreasing from 490 to 189 kg/(ha·yr) and N 2 O from 7.39 to 4.32 kg/(ha·yr), corresponding to reductions of 61.4% and 41.5%, respectively. This agricultural land use change significantly impacted the reliance of CH 4 and N 2 O fluxes on both biotic and abiotic variables across the three wetland systems, stemming from diverse agricultural practices. Furthermore, the scaled global warming potential (SGWP) and net ecosystem economic profit (NEEP)-SGWP of RM (24.1 t CO 2 -eq/(ha·yr) and 125 kg CO 2 -eq per $/(ha·yr)) were obviously higher than those of RS (9.66 t CO 2 -eq/(...