Accurate estimates of methane (CH₄) fluxes from restored peatlands are needed to inform emission factor estimations and reporting. Flux measurements are usually taken during the daytime but such measurements may provide biased estimates of overall CH₄ emissions if night-time fluxes differ from daytime fluxes. Diurnal variations in CH₄ fluxes have been reported for a range of peatland types, but not for restored raised bogs which are important carbon stores in some countries. To help fill this knowledge gap, we investigated diurnal variations in CH₄ emissions from a restored raised bog. CH₄ fluxes from a restored raised bog were measured in two 24-hr field campaigns using flux chambers. Carbon dioxide (CO₂) fluxes were also monitored, as were a suite of complementary environmental variables. Night-time CH₄ fluxes were significantly greater than daytime fluxes during both campaigns, by 10.4% and 36.1%, respectively. In Campaign 1 air temperature was the best predictor of CH₄ fluxes, whereas in Campaign 2 net ecosystem exchange (NEE) values were the best predictor. This study shows that diurnal variations in CH₄ fluxes exist in a restored peatland and that current approaches biased to daytime measurements will underestimate CH₄ emissions from restored peatlands to the atmosphere.

需要准确估算出恢复的泥炭地甲烷（CH ₄）通量，以为排放因子估算和报告提供依据。通量测量通常在白天进行，但是如果夜间通量与白天通量不同，则此类测量可能会提供总体CH ₄排放量的偏差估计。据报道，多种泥炭地类型的CH ₄通量存在日变化，但恢复的沼泽沼泽却没有，这在某些国家是重要的碳储量。为了弥补这一知识空白，我们调查了恢复的升高沼泽中CH ₄排放量的日变化。使用助焊剂室在两个24小时的野战中测量了来自恢复的凸起沼泽的CH ₄助焊剂。二氧化碳（CO₂）还监测通量，以及一系列互补的环境变量。在这两个活动中，夜间CH ₄通量均显着大于白天通量，分别增加了10.4％和36.1％。在竞选1中，气温是CH ₄通量的最佳预测指标，而在竞选2中，净生态系统交换（NEE）值是最佳预测指标。这项研究表明，恢复的泥炭地中存在CH ₄通量的昼夜变化，目前偏向白天测量的方法将低估恢复的泥炭地向大气中的CH ₄排放量。