Mangrove sediment blue carbon estimates

Carbon accumulation in coastal wetlands is normally assessed by extracting a sediment core and estimating its carbon content and bulk density. Because carbon content and bulk density are functionally related, the latter can be estimated gravimetrically from a section of the core or, alternatively, from the carbon content in the sample using the Mixing Model equation from soil science. We analyzed the effect that the choice of corer and the method used to estimate bulk density could have on the final estimates of carbon storage in the sediments. The choice of corer did not have much influence on the final estimates of carbon density; the main factor in selecting a corer is the operational difficulties that each corer may have in different types of sediments. Because of the multiplication of errors in a product of two variables subject to random sampling error, when using gravimetric estimates of bulk density, the dispersion of the data points in the estimation of total carbon density ris..., ,滨海湿地的碳蓄积量通常通过采集沉积物岩芯，并测定其碳含量与容重（bulk density）进行评估。鉴于碳含量与容重存在功能相关性，可通过重量分析法对岩芯切片的容重进行估算，亦可借助土壤科学领域的混合模型方程，基于样品中的碳含量间接估算容重。本研究分析了岩芯采样器的选择，以及容重估算方法的差异，对沉积物碳储量最终估算结果的影响。岩芯采样器的选择对碳密度的最终估算结果影响有限；选取采样器时的核心考量因素为，不同类型沉积物中各采样器可能面临的作业难度差异。由于两个受随机抽样误差影响的变量相乘会放大误差，因此在采用重量分析法估算容重时，总碳密度估算过程中数据点的离散程度会……