Mapping peat thickness and carbon stocks of the central Congo Basin using field data
Mapping peat thickness and carbon stocks of the central Congo Basin using field data
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DOI：
10.1038/s41561-022-00966-7
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发表时间：
2022-07-21
影响因子：
18.3
通讯作者：
Lewis, Simon L.
中科院分区：
文献类型：
--
作者：
Crezee, Bart;Dargie, Greta C.;Lewis, Simon L.
世界上最大的热带泥炭地复合体位于刚果盆地中部。然而，缺乏现场测量来了解泥炭地的分布和其中储存的碳量。到目前为止，这一地区的泥炭只在刚果共和国北部主要靠雨水灌溉的河间盆地取样。在这里，我们提出了在刚果，其中包括三分之二的估计泥炭地面积，包括从以前没有记录的河流影响的设置的民主共和国泥炭的第一次广泛的实地调查。我们使用两国的实地数据计算了刚果盆地中部泥炭厚度（平均值1.7 +/- 0.9 m;最大值5.6 m）和泥炭碳密度（平均值1，712 +/- 634 MgC ha（-1）;最大值3，970 MgC ha（-1））的第一个空间模型。我们发现，泥炭地复合体覆盖167，600 km（2），占世界热带泥炭地面积的36%，整个地区地下泥炭中储存了29.0 PgC（95%置信区间，26.3-32.2 PgC）。我们基于测量的约束条件对刚果盆地中部的全球重要泥炭碳储量具有很高的信心，总计约占世界热带泥炭碳的28%。只有8%的泥炭碳位于国家保护区内，这表明其对未来土地利用变化的脆弱性。实地调查表明，刚果盆地中部的泥炭地是全球重要的碳储量，储存了世界上约28%的热带泥炭碳。
The world's largest tropical peatland complex is found in the central Congo Basin. However, there is a lack of in situ measurements to understand the peatland's distribution and the amount of carbon stored in it. So far, peat in this region has been sampled only in largely rain-fed interfluvial basins in the north of the Republic of the Congo. Here we present the first extensive field surveys of peat in the Democratic Republic of the Congo, which covers two-thirds of the estimated peatland area, including from previously undocumented river-influenced settings. We use field data from both countries to compute the first spatial models of peat thickness (mean 1.7 +/- 0.9 m; maximum 5.6 m) and peat carbon density (mean 1,712 +/- 634 MgC ha(-1); maximum 3,970 MgC ha(-1)) for the central Congo Basin. We show that the peatland complex covers 167,600 km(2), 36% of the world's tropical peatland area, and that 29.0 PgC is stored below ground in peat across the region (95% confidence interval, 26.3-32.2 PgC). Our measurement-based constraints give high confidence of globally significant peat carbon stocks in the central Congo Basin, totalling approximately 28% of the world's tropical peat carbon. Only 8% of this peat carbon lies within nationally protected areas, suggesting its vulnerability to future land-use change.Field surveys suggest peatlands in the central Congo Basin are globally significant carbon stocks, storing approximately 28% of the world's tropical peat carbon.