Woodchip bioreactors have the capability to promote the reduction of reactive nitrogen in the nitrate (NO₃⁻) form to dinitrogen (N₂), a harmless gas in the atmosphere. Nevertheless, during the reaction the potent greenhouse gas nitrous oxide (N₂O) is produced and can be released if denitrification is not complete. The aim of this experiment was to quantify the effect of a soil cap, the concentration of NO₃⁻ inflow and drying-rewetting cycles (DRW) on N₂O emissions from bench top bioreactors (BTBs, 36.2 × 24.2 × 16.8 cm). The soil cap effect was quantified by comparing the performance of two treatments (n = 3): soil cap (CAP) and soil cap free (UNCAP). The NO₃⁻ inflow was simulated by feeding the BTBs with two NO₃⁻ concentrations (10 and 5 mg N L⁻¹), and DRW were simulated by saturating and draining the BTBs. Nitrous oxide was quantified in the water samples as well as measured from the surface of the BTBs.

The soil cap proved effective at decreasing surface N₂O emissions with a reduction of total N₂O emissions (calculated as the sum of dissolved N₂O and surface N₂O emissions) ranging from 30.4 to 42.9%. The NO₃⁻ inflow affected dissolved N₂O and surface N₂O emissions with higher values (average of 3.41 and 0.36 mg m⁻² d⁻¹, respectively for CAP, and average of 2.92 and 2.52 mg m⁻² d⁻¹, respectively for UNCAP) measured at high NO₃⁻ inflow. Drying-rewetting cycles influenced dissolved N₂O and surface N₂O emissions, with values following rewetting that accounted for more than 56% of the total N₂O emissions for both treatments. This study confirmed that soil caps are effective at mitigating N₂O emissions and contributed to a better understanding of N₂O dynamics induced by two different NO₃⁻ inflow concentrations and DRW.

木片的生物反应器具有促进活性氮中的硝酸盐（NO的还原能力₃ ^- ）形式，以二氮（N ₂大气中），无害的气体。但是，在反应过程中会产生强效的温室气体一氧化二氮（N ₂ O），如果反硝化未完成，则可能释放出。该实验的目的是定量土壤帽的作用，NO的浓度₃ ^- N个流入和干燥再湿循环（DRW）₂从台式生物反应器O排放（BTBS，36.2×24.2×16.8厘米）。通过比较两种处理的效果量化土壤盖层效应（n = 3）：土壤盖（CAP）和无土壤盖（UNCAP）。的NO ₃ ^-的流入是由具有两个NO供给BTBS模拟₃ ^-浓度（10和5毫克N-大号^-1），和DRW由饱和和排出BTBS模拟。一氧化二氮在水样中也进行了定量，并从BTB的表面进行了测量。

证明土壤盖有效减少了地面N ₂ O排放，总N ₂ O排放（以溶解N ₂ O和地面N ₂ O排放之和计算）减少了30.4％至42.9％。的NO ₃ ^-流入受影响的固溶N ₂ O和面N _2个O排放具有较高的值（平均的3.41和0.36毫克米^-2 d ^-1，分别为CAP，和平均的2.92和2.52毫克米^-2 d ^-1，分别对联合国联合呼吁）在高的NO测量₃ ^-流入。干燥-再湿循环对溶解氮_2的影响O和表面N ₂ O排放，重新润湿后的值占两种处理的N ₂ O排放总量的56％以上。该研究证实，土壤盖是有效地缓解Ñ ₂ O排放，并有助于更好地理解N中的_2代由两个不同的NO诱导ö动力学₃ ^-流入浓度和DRW。