Ancient soil organic carbon quantification in worldwide soils

These are the files for the paper in press for Global Change Biology entitled " Soil carbon dynamics reshaped by ancient carbon quantification". The doi of this paper will be provided once the paper will be published. In this paper we applied a mixing linear equation to 313 soils worldwide from radiocarbon databases to estimate the ancient OC (radiocarbon-free) contained in these soils. Beyond the calculated contribution of this ancient OC to soil organic carbon (SOC) in top, sub and deepsoils, we revisited the mean 14C age of SOC and consequently the soil carbon dynamics. The “Copard et al-GCB-data.xls” file is split in two table. Table 1 is referred to the soil 14C ISRaD and LSCE database and additional variables we calculated in order to know the ancient organic carbon mass concentration in a considered soil profile and its contribution to the soil organic carbon for each soil layer. Some of these variables were either calculated by using the equations given in the associated article published in Global Change Biology (Copard et al) or derived from literature associated to the reference listed in the two databases (ISRaD and LSCE). Table 2 is identical to table 1 with additional variables devoted to loess formations, as the age of the loess deposit (BP), the organic carbon concentration from loess, and additional references with their doi where these specific variables were found. The Copard et al-GCB-readme.xls file consists in a summary file with your data explaining the variables used and entries in each row and column of the data file. This includes units of measurement, a description of each variable and explanation of how the files relate to each other.本文件集对应已被《全球变化生物学（Global Change Biology）》接收待刊的论文《古碳定量重塑土壤碳动态（Soil carbon dynamics reshaped by ancient carbon quantification）》。该论文的DOI将在正式刊发后公布。 本研究通过将混合线性方程应用于全球范围内313份取自放射性碳数据库的土壤样本，估算了其中所含的古有机碳（OC，无放射性碳）组分。除了计算该古OC对表层、亚表层及深层土壤有机碳（SOC）的贡献占比外，本研究还重新探讨了SOC的平均14C年龄，进而揭示了土壤碳动态的变化规律。 本数据集包含的「Copard et al-GCB-data.xls」文件分为两个数据表。数据表1对应土壤14C的ISRaD与LSCE数据库，以及我们为计算目标土壤剖面的古有机碳质量浓度及其在各土层中对土壤有机碳的贡献占比所计算得到的额外变量。部分变量通过《全球变化生物学（Global Change Biology）》刊载的本研究配套论文（Copard等）中给出的公式计算得到，其余变量则源自ISRaD和LSCE两个数据库所附参考文献中的公开数据。数据表2与数据表1结构一致，但额外增设了针对黄土地层的相关变量，包括黄土沉积的年龄（BP）、黄土的有机碳浓度，以及这些特定变量来源的附加参考文献及其DOI。 「Copard et al-GCB-readme.xls」为数据说明文件，汇总了本数据集的相关信息，包括数据文件中各行列的变量定义、各变量的计量单位与详细说明，以及各文件间的关联关系。