【摘要】 为探究硝化抑制剂双氰胺和生物炭对菜地土壤N₂O和CO₂排放的影响,采用室内静态培养的方式测定相同氮肥用量下菜地土壤添加双氰胺和生物炭后N₂O和CO₂的排放通量和累积排放量。结果表明,氮肥处理的N₂O累积排放量较控制处理（CK）提高了14倍,达1 192.03 ng/m²;双氰胺和生物炭处理的N₂O累积排放量分别为100.15,387.79 ng/m²,较氮肥处理分别降低了91.6%和67.5%。硝化抑制剂对CO₂也有减排作用,其CO₂累积排放量为238.47μg/m²,较氮肥处理降低56.4%;而生物炭处理的CO₂累积排放量较氮肥处理增加了46.2%。综上所述,氮肥的施用显著提高了土壤N₂O和CO₂的排放通量和累积排放量;双氰胺可有效降低因氮肥施用导致的土壤N₂O和CO₂的排放;生物炭对N₂O排放有一定的减排作用,但会促进土壤CO₂的排放。更多还原

【Abstract】 To explore the effects of dicyandiamide nitrification inhibitors（DCD）and biocharon on N₂O and CO₂ emission from vegetable fields soils, N₂O and CO₂ emission fluxes and cumulative emissions from vegetable soils were measured by static incubation in laboratory under the same nitrogen fertilizer application rate. The results showed that the cumulative N₂O emission of nitrogen fertilizer treatment increased 14 times compared with the control treatment, reaching 1 192.03 ng/m². The cumulative emissions of nitrification inhibitors and biochar were 100.15, 387.79 ng/m², respectively, which were 91.6% and 67.5% lower than nitrogen fertilizer treatment. At the same time, nitrification inhibitors could also reduce CO₂ emissions. The cumulative CO₂ emission of nitrification inhibitors treatment was 238.47 μg/m², which was 56.4% lower than that of nitrogen fertilizer treatment. Biochar treatment increased soil CO₂ emissions46.2% than nitrogen fertilizer treatment. In conclusion, the application of nitrogen fertilizer in vegetable soil can significantly increase the N₂O and CO₂ emission fluxes and cumulative emission. DCD can effectively reduce soil N₂O and CO₂ emissions caused by nitrogen fertilizer application. Biochar can reduce N₂O emission caused by nitrogen fertilizer application, but it can promote soil CO₂ emission, and its comprehensive emission reduction ability still needs further study.更多还原