湿地以其碳(C)封存能力和在缓解气候变化方面的重要性而被广泛认可。然而,为了最好地告知区域保护规划,湿地类型之间以及地上和地下隔室之间的碳储量变化需要进一步调查。此外,泥炭盆地的测深经常被忽视,土壤碳储量计算主要依赖于最厚的泥炭段,可能导致高估。这里,我们采样了加拿大东南部57个湿地的植被和土壤,以表征四种湿地类型中地上和地下有机碳储量的变化:开放沼泽,打开芬斯,沼泽,和森林泥炭地。我们还比较了是否考虑泥炭测深的碳储量估算方法。结果表明,泥炭厚度,因此土壤有机碳(SOC),由于泥炭盆地的形状,场地内变化很大。省略测深法导致站点规模的SOC平均高估约20-38%,根据所使用的方法,站点之间差异很大(高估高达200%)。BelowgroundC种群因湿地类型而异,沼泽的平均值为132、101、19和44kgCm-2,芬斯,沼泽,和森林泥炭地,分别。在开阔的沼泽和沼泽中,地上的C几乎为零,但在沼泽中达到了总C存量的约30%,在森林泥炭地达到了约15%。树根和灌木中的C种群可以忽略不计。尽管沼泽和森林泥炭地的C密度(每平方米)较低,由于这些生态系统在景观中的丰富,因此在区域尺度上代表了主要的C种群。总的来说,这四种湿地类型每单位面积储存的碳估计是森林的2-7倍。根据湿地类型评估碳储量的差异,在计算中整合泥炭测深法的同时,能显著提高区域湿地保护规划。
Wetlands are widely recognized for their carbon (C) sequestration capacity and importance at mitigating climate change. Yet, to best inform regional conservation planning, the variability of C stocks among wetland types and between above and belowground compartments requires further investigation. Additionally, the bathymetry of
peat basins has often been ignored, with soil C stock calculations mostly relying on the thickest
peat section, potentially leading to overestimates. Here, we sampled vegetation and soil of 57 wetlands of southeastern Canada to characterize the variability of above and belowground organic C stocks among four wetland types: open bogs, open fens, swamps, and forested peatlands. We also compared carbon stock estimation approaches considering
peat bathymetry or not. Results showed that
peat thickness, and thus soil organic C (SOC), varied substantially within sites due to
peat basin shapes. Omitting bathymetry led to site-scale SOC overestimates of about 20-38 % on average, depending on the approach used, with wide variability among sites (overestimates up to 200 %). Belowground C stocks varied among wetland types with mean values of 132, 101, 19, and 44 kg C m-2 for bogs, fens, swamps, and forested peatlands, respectively. Aboveground C was nearly zero in open bogs and fens but reached ∼30 % of total C stock in swamps and ∼ 15 % in forested peatlands. C stocks in tree roots and shrubs were negligible. Despite the lower C density (per m2) of swamps and forested peatlands, these ecosystems represented the dominant C stocks at the regional scale due to their abundance in the landscape. Overall, the four wetland types stored an estimated 2-7 times more C than forest per unit area. Evaluating differences in C stocks according to wetland type, while integrating peat bathymetry in calculations, can significantly improve regional wetland conservation planning.