Research advances in methane emission from agricultural drainage ditch in coastal reclamation area

Coastal reclamation area is an agricultural region formed by artificial transformation of coastal tidal flats. Changes in land use types would reshape regional carbon cycling patterns. Methane (CH₄) is a short-lived greenhouse gas with a high global warming potential, the emission of which is a key contributor to the accelerated global climate change. As an integral component of coastal reclamation areas, agricultural drainage ditches play a key role in regulating regional water-salt balance and material cycling. As heavily influenced by unique hydrological proce-sses and nutrient inputs, CH₄ emissions from drainage ditches in these areas are active and non-negligible. We reviewed the current progress in CH₄ metabolism within agricultural drainage ditches of coastal reclamation areas, focusing on the processes of CH₄ production, oxidation, emission and influencing factors. Future research should focus on the CH₄ emission mechanisms under the influence of desalination-resalting processes and algal bloom dynamics, as well as accurately estimating regional-scale fluxes. The goal is to provide a scientific foundation for the formulation of carbon mitigation strategies in coastal reclamation areas.