Manure amendment in croplands is common practice for soil carbon sequestration, and may also reduce greenhouse gas emissions. Few studies focus on the effects of manure application on the net greenhouse gas emissions (NGHGE, the global warming impacts of soil carbon sequestration and CH₄ and N₂O emissions) in double-rice cropping fields. Herein, a field experiment was conducted to analyze the effects of pig manure application in combination with reduced chemical fertilizers on the NGHGE, soil properties, and yields in a double-rice paddy field in 2012–2015. Four treatments were included: 0 N (no nitrogen fertilizer); 1/2 N (chemical nitrogen fertilizer reduced by 50%); N (100% chemical nitrogen fertilizer); and 1/2 N + PM (pig manure complemented with chemical fertilizer application). The average annual CH₄ emissions for 1/2 N + PM were 53%, 50%, and 32% higher than those for 0 N, 1/2 N, and N treatments, respectively (p < 0.05). The soil organic carbon sequestration rates (SOCSR) for 1/2 N + PM were 224%, 208%, and 192% higher than those for 0 N, 1/2 N, and N treatments, respectively (p < 0.05). The average annual N₂O emissions from 1/2 N + PM were 51% lower than those from the N treatment. Compared to 0 N, 1/2 N and N treatments, the average NGHGE for 1/2 N + PM decreased by 41%, 41%, and 52%, and the average greenhouse gas intensity (GHGI, the yield-scaled NGHGE) from 1/2 N + PM reduced by 67%, 52%, and 53%, respectively. The decreases in NGHGE and GHGI were predominantly due to increased SOCSR (contributions of 187–308% and 81–325%, respectively) in 1/2 N + PM. The average soil nitrate, microbial biomass carbon and nitrogen, soil organic carbon contents, and pH value for 1/2 N + PM treatment were higher than those for the 1/2 N and N treatments (p < 0.05). Compared to 0 N and 1/2 N treatments, 1/2 N + PM treatment significantly increased the average rice yield. However, no significant difference in average yield was observed between the 1/2 N + PM and N treatments. Gross margin analysis showed that the economic profit for 1/2 N + PM was higher than that for the other three treatments. Thus, the combined application of reduced chemical fertilizers and pig manure is an effective and economic way to neutralize greenhouse gas emissions and increase soil fertility in double-rice cropping systems.

农田肥料改良是土壤固碳的常见做法，也可以减少温室气体排放。很少有研究关注粪肥施用对温室气体净排放（NGHGE、土壤碳固存和 CH ₄和 N ₂对全球变暖的影响）的影响O 排放）在双季稻田中。在此，通过田间试验分析了 2012-2015 年双稻田中猪粪联合减量化肥对 NGHGE、土壤性质和产量的影响。包括四个处理：0 N（不施氮肥）；1/2 N（化学氮肥减少50%）；N（100%化学氮肥）；和 1/2 N + PM（猪粪辅以化肥施用）。1/2 N + PM 的年均 CH ₄排放量分别比 0 N、1/2 N 和 N 处理高 53%、50% 和 32%（p < 0.05)。1/2 N + PM 处理的土壤有机碳封存率 (SOCSR) 分别比 0 N、1/2 N 和 N 处理高 224%、208% 和 192% ( p  < 0.05)。年均 N ₂1/2 N + PM 的 O 排放量比 N 处理的排放量低 51%。与 0 N、1/2 N 和 N 处理相比，1/2 N + PM 的平均 NGHGE 降低了 41%、41% 和 52%，平均温室气体强度（GHGI，产量尺度的 NGHGE）从 1/2 N + PM 分别减少了 67%、52% 和 53%。NGHGE 和 GHGI 的下降主要是由于 1/2 N + PM 中 SOCSR 的增加（贡献分别为 187-308% 和 81-325%）。1/2 N + PM处理的平均土壤硝酸盐、微生物生物量碳和氮、土壤有机碳含量和pH值高于1/2 N和N处理（p < 0.05）。与0 N和1/2 N处理相比，1/2 N + PM处理显着提高了水稻的平均产量。然而，在 1/2 N + PM 和 N 处理之间没有观察到平均产量的显着差异。毛利率分析表明，1/2 N + PM 的经济利润高于其他三个处理。因此，减量化肥和猪粪联合施用是中和双季稻系统温室气体排放和提高土壤肥力的有效且经济的方式。