Data from: Geochemical analyses reveal the importance of environmental history for blue carbon sequestration

Coastal habitats including saltmarshes and mangrove forests can accumulate and store significant blue carbon stocks, which may persist for millennia. Despite this implied stability, the distribution and structure of intertidal-supratidal wetlands is known to respond to changes imposed by geomorphic evolution, climatic, sea level and anthropogenic influences. In this study, we reconstruct environmental histories and biogeochemical conditions in four wetlands of similar contemporary vegetation in SE Australia. The objective is to assess the importance of historic factors to contemporary organic carbon (C) stocks and accumulation rates. Results from the four cores – two collected from marine influenced saltmarshes (WAP-M and POR-M) and two from fluvial influenced saltmarshes (WAP-F and POR-F) – highlight different environmental histories and preservation conditions. High C stocks are associated with the presence of a mangrove phase below the contemporary saltmarsh sediments in the POR-M and POR-F cores. 13C NMR analyses show this historic mangrove root C to be remarkably stable in its molecular composition despite its age, consistent with its position in deep sediments. WAP-M and WAP-F cores did not contain mangrove root C, however, significant preservation of char C (up to 46% of C in some depths) in WAP-F reveals the importance of historic catchment processes to this site. Together, these results highlight the importance of integrating historic ecosystem and catchment factors into attempts to upscale C accounting to broader spatial scales.

Usage Notes
Kelleway et al - 13CNMR -POR-FThis dataset contains results of continuous sampling down the depth of core profiles (ITRAX and magnetic susceptibility) and results of discrete sampling units (13C NMR and particle size characterisation). Methods of analysis are contained within the methods section of the published article.Kelleway et al - Geochemical analyses reveal the importance of environmental history for blue carbon sequestration.xlsx

海岸生境包括盐沼与红树林，能够积累并储存大量蓝碳(blue carbon)储量，这类储量可留存数千年之久。尽管这类生境看似具有稳定性，但学界已知潮间带-潮上带湿地(intertidal-supratidal wetlands)的分布与结构，会响应地貌演化、气候、海平面及人类活动带来的环境变化。
本研究针对澳大利亚东南部4处现代植被类型相近的湿地，重建其环境演化历史与生物地球化学特征。本研究旨在评估历史环境因素对现代有机碳(organic carbon)储量及累积速率的影响权重。
对4处湿地岩芯(core)的分析结果显示其环境演化历史与碳储存保存条件存在显著差异：其中2处采自受海洋影响的盐沼（WAP-M与POR-M），另外2处采自受河流影响的盐沼（WAP-F与POR-F）。POR-M与POR-F岩芯中，现代盐沼沉积物下方存在红树林沉积层位，该层位对应较高的有机碳储量。碳十三核磁共振(13C NMR)分析结果显示，尽管历经漫长地质时间，该历史时期的红树林根系有机碳的分子组成仍保持极高稳定性，这与其埋藏于深层沉积物中的位置相符。WAP-M与WAP-F岩芯则未检出红树林根系有机碳，但WAP-F岩芯中存在大量保存完好的炭质有机碳（部分层位占总有机碳的比例可达46%），这揭示出流域历史过程对该湿地的重要影响。综上，本研究结果凸显出：在将蓝碳核算推广至更大空间尺度时，需整合历史生态系统与流域过程相关因素。

使用说明
Kelleway等人——13C核磁共振——POR-F
本数据集包含岩芯剖面连续采样的相关结果（ITRAX扫描与磁化率(magnetic susceptibility)测定），以及离散采样单元的分析结果（13C核磁共振与粒度表征(particle size characterisation)）。具体分析方法详见已发表论文的方法学章节。
Kelleway等人——《地球化学分析揭示环境历史对蓝碳固存的重要性》.xlsx