The CO₂ and CH₄ fluxes across the water-air interface were determined in two groups of swimming crab (Portunus trituberculatus)-ridgetail white prawn (Exopalaemon carinicauda) polyculture ponds. One group of ponds with sediment improver application were referred to as SAPs, and the other group receiving no sediment improver were as NSPs. During the farming season, both the SAPs and NSPs acted as CO₂ sinks and CH₄ sources. The cumulative CO₂-C fluxes from the SAPs and NSPs were −26.78 and −23.49 g m⁻², respectively, and the cumulative CH₄-C emissions from the SAPs and NSPs were 0.24 and 0.28 g m⁻², respectively. CO₂ fluxes were significantly related to net primary production and water pH, and CH₄ fluxes were mainly regulated by water temperature during the farming season. The application of the oxidation-based sediment improver had a positive effect on reducing the CH₄ emissions across the water-air interface but had no effect on CO₂ fluxes. The sediment improver reduced the organic matter contents and improved the sediment pH and redox potential, which may have facilitated a decrease in CH₄ production in the sediment. The CO₂ produced through the oxidation of organic material in the sediment may have been absorbed by strong photosynthesis, resulting in a nonsignificant difference in CO₂ fluxes between the SAPs and NSPs. The results indicated that the application of sediment improvers in coastal polyculture ponds can reduce carbon emissions, especially CH₄ emissions, during the farming period and could help mitigate global warming with regard to the sustained-flux global warming potential (SGWP) and sustained-flux global cooling potential (SGCP) models over a 20-year time horizon. Future studies on the CO₂ and CH₄ production rates of the sediment and the related microbial community could improve our understanding of the effect mechanism of the application of sediment improvers on CO₂ and CH₄ emissions from mariculture ponds.

在两组游泳蟹（Portunus trituberculatus）-脊尾白对虾（Exopalaemon carinicauda）混养池中测定了穿过水-空气界面的CO ₂和CH _4通量。使用沉积物改良剂的一组池塘称为 SAPs，另一组未使用沉积物改良剂的池塘称为 NSPs。在耕作季节，SAP 和 NSP 都充当 CO ₂汇和 CH ₄源。SAPs和NSPs的累积CO ₂ -C通量分别为-26.78和-23.49 gm ^-2，SAPs和NSPs的CH ₄ -C累积排放量分别为0.24和0.28 gm^-2，分别。CO ₂通量与净初级产量和水体pH值显着相关，CH ₄通量主要受农季水温的调节。基于氧化的沉积物改良剂的应用对减少通过水-空气界面的CH ₄排放具有积极作用，但对CO ₂通量没有影响。沉积物改良剂降低了有机质含量，提高了沉积物的 pH 值和氧化还原电位，这可能有助于减少沉积物中 CH ₄的产生。CO ₂沉积物中有机物质氧化产生的物质可能已被强光合作用吸收，导致 SAP 和 NSP 之间的 CO ₂通量差异不显着。结果表明，在沿海混养池塘中应用沉积物改良剂可以减少养殖期间的碳排放，尤其是 CH ₄排放，并有助于缓解全球变暖的持续通量全球变暖潜势（SGWP）和持续通量20 年时间范围内的全球冷却潜力 (SGCP) 模型。_{CO 2}和 CH ₄的未来研究沉积物和相关微生物群落的生产率可以提高我们对沉积物改良剂应用对海水养殖池塘CO ₂和CH ₄排放的影响机制的理解。