Dataset: Sediment depth and accretion shape belowground mangrove carbon stocks across a range of climatic and geologic settings.

We assessed the limits of mangrove sedimentary carbon storage by sampling sediments in diverse mangrove environments across four geographic areas: the volcanic Galapagos, the arid Baja Peninsula, and the geologically and climatically distinct Caribbean and Pacific coasts of Panama. At 80 sites across these areas, we quantified the organic carbon density, sampled with depth, of entire sediment columns. Most sites were cored in several locations, generally across an intertidal transect. Sediment depth, bulk density, and organic carbon density were measured with depth in each core. Some cores also had one or more sample depth radiocarbon dated, allowing for estimates of long-term accretion rates. Depth-integrated carbon stocks are highly variable, from < 17 to > 1700 MgCorg ha-1.

我们通过对四个地理区域内的多样红树林环境开展沉积物采样，评估了红树林沉积碳储量的极限。这四个区域分别为火山活动活跃的加拉帕戈斯群岛、干旱的下加利福尼亚半岛，以及地质与气候特征均显著迥异的巴拿马加勒比海岸与太平洋海岸。我们在上述区域的80个采样点中，按深度分层采集并测定了完整沉积物柱样的有机碳密度。多数采样点在多个位置布设了柱状取样，采样范围通常覆盖潮间带断面。对每一根沉积物岩芯，均按深度分层测定了沉积物厚度、容重与有机碳密度。部分岩芯还选取了一个或多个深度的样品进行放射性碳定年，由此可估算沉积物的长期沉积速率。经深度整合计算的碳储量存在显著波动，范围从不足17 MgCorg·ha⁻¹ 至超过1700 MgCorg·ha⁻¹。