RECONSTRUCTION OF HUMAN DIET FROM DELTA-C-13 AND DELTA-N-15 IN CONTEMPORARY JAPANESE HAIR - A STOCHASTIC METHOD FOR ESTIMATING MULTISOURCE CONTRIBUTION BY DOUBLE ISOTOPIC TRACERS
RECONSTRUCTION OF HUMAN DIET FROM DELTA-C-13 AND DELTA-N-15 IN CONTEMPORARY JAPANESE HAIR - A STOCHASTIC METHOD FOR ESTIMATING MULTISOURCE CONTRIBUTION BY DOUBLE ISOTOPIC TRACERS
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DOI：
10.1016/0883-2927(92)90033-y
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发表时间：
1992-03-01
影响因子：
3.4
通讯作者：
MINAGAWA, M
中科院分区：
文献类型：
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作者：
MINAGAWA, M
本文提出了一种基于同时测量混合碳、氮稳定同位素组成来估计多源贡献的随机方法。双同位素示踪分析基本上允许通过质量平衡计算来确定多达三种源的混合比例。对于三个以上的源，随机方法可以提供混合比例的可能范围。在这项工作中，采用蒙特卡罗模拟的随机方法来重建当代日本人的饮食消费。当代日本人头皮头发的δ - c -13和δ - n -15相对于PDB和大气N2的平均值分别为-18.2 +/- 0.4和10.3 +/- 0.4。以现代日本人为研究对象，利用5种主要食物群和头发的平均同位素比值建立了饮食模型。在此模型的基础上，采用随机方法模拟人类进食。为拟合毛发C、N同位素分布，估计了符合合理能量/蛋白质摄取比的饲粮模式范围。估计的平均膳食模式中，C3植物、豆类、C4植物、陆生动物产品和鱼类产品对蛋白质的贡献分别为35.9%、16%、14%和27%，与《国家统计报告》中观察到的食物消费情况吻合良好。估计C4型植物对蛋白质的贡献在10% ~ 20%之间，比统计估计的要高得多。因此，这种随机方法在基于C和N同位素比值的饲料分析中是有用的。如果来源材料的同位素组成差别很大，并且每种来源不能通过混合其他来源在同位素上重现，则随机模拟可以准确地指出不同来源的贡献。这种方法也适用于许多发生混合的地球化学问题。
A stochastic method has been proposed for estimating contributions of multi-sources based on a simultaneous measurement of C and N stable isotope compositions of a mixture. Double isotope tracer analyses essentially allow a determination of the mixing proportion of up to three sources by mass balance calculations. For more than three sources, a stochastic approach may provide a possible range of mixing proportions. In this work, a stochastic method using the Monte Carlo simulation was employed for reconstructing the dietary consumption of contemporary Japanese.The mean delta-C-13 and delta-N-15 values of contemporary Japanese scalp hair were found to be -18.2 +/- 0.4 and 10.3 +/- 0.4 parts per thousand relative to PDB and the atmospheric N2, respectively. A dietary model was constructed by using mean isotope ratios of five major food groups and hair for modern Japanese. Based on this model, a stochastic method was applied to simulate human feeding. A range of dietary patterns, consistent with reasonable energy/protein uptake ratio, was estimated for fitting C and N isotope distributions of hair. The estimated mean dietary pattern has protein contributions of 35, 9, 16, 14, 27% from C3 plants, legumes, C4 plants, land animal products, and fish products, respectively, in good agreement with the observed food consumption in the National Statistics Report. The contribution of C4 type plant was estimated to range from 10 to 20% in protein, indicating much higher consumption than the statistical estimation.Thus, this stochastic method is useful in dietary analysis based on C and N isotope ratios. If the isotopic compositions of source materials are sufficiently different and each source is not isotopically reproducible by mixing of others, the stochastic simulation may indicate accurately the different source contributions. This method is applicable also to many geochemical problems where mixing occurs.