多分子C证据用于对陆地碳储存和出口的矿物控制
Hannah Gies1, Maarten Lupker1, Valier Galy2
1Department of Earth Sciences, ETH Zürich, 8092 Zürich, Switzerland.
概括
土壤生物标记物的放射性碳年代测定,如甘二甲基甘四 (GDGTs) 揭示了土壤碳循环的洞察力. 将GDGT与植物和火灾衍生的碳标记物进行比较,突出了它们独特的动员和稳定途径.
科学领域:
- 地质化学 地质化学
- 生物地质化学生物地质化学
- 环境科学 环境科学
背景情况:
- 对生物标记分子的放射性碳分析为地球碳循环提供了洞察力.
- 专注于更高的植物生物标志物,但追踪土壤衍生 (儿源) 碳对于了解生态系统碳循环和有机碳出口至关重要.
- 土壤在调节生态系统碳动态方面发挥着关键作用.
研究的目的:
- 为了确定在河流沉积物中的甘二甲基甘四甲基 (GDGTs) 的放射性碳年龄.
- 为了比较GDGT的放射性碳年龄与更高的植物生物标记物和 pyrogenic碳标记物 (烯聚碳酸,BPCAs).
- 评估GDGTs作为土壤周转和出口的追踪器的潜力.
主要方法:
- 对特定化合物类的放射性碳 (C) 分析:GDGTs,叶-酸酸和酸,木质素衍生的和BPCAs.
- 对河流沉积物的分析,以捕获出口的土壤有机物质.
- 放射性碳年龄与盆地特性以及不同类型的生物标志物之间的比较.
主要成果:
- GDGT的放射性碳年龄 (Δ14C) 与盆地特性与植物衍生的生物标记物 (素,叶酸) 类似,表明土壤储存的影响.
- 在GDGT和其他生物标志物之间存在系统的放射性碳年龄抵消.
- 这些偏移表明动员途径和/或矿物质协会的影响明显年龄的差异.
结论:
- GDGT显示出在河流系统中对土壤有机物循环和出口的追踪器的潜力.
- 观察到的年龄偏移凸显了使用生物标志物来追踪碳来源和年龄的复杂性,因为运输和稳定机制不同.
- 需要进一步的研究来完善在土壤碳动态的背景下对GDGT放射性碳年龄的解释.
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