Competition or collaboration: Clay formation sets the relationship between silicate weathering and organic carbon burial in soil
Competition or collaboration: Clay formation sets the relationship between silicate weathering and organic carbon burial in soil
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竞争还是合作：粘土的形成决定了硅酸盐风化与土壤中有机碳埋藏之间的关系
DOI：
10.1016/j.epsl.2024.118584
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发表时间：
2024
影响因子：
5.3
通讯作者：
Ibarra, Daniel E.
中科院分区：
文献类型：
--
作者：
Ramos, Evan J.;Larsen, William J.;Hou, Yi;Muñoz, Sebastian;Kemeny, Preston Cosslett;Scheingross, Joel S.;Repasch, Marisa N.;Hovius, Niels;Sachse, Dirk;Ibarra, Daniel E.
硅酸盐风化作用和土壤有机碳（OC）埋藏对大气CO2具有调节作用，但二者之间的相互影响尚不清楚。一般来说，OC氧化可以产生酸，驱动硅酸盐风化，但在风化过程中形成的粘土矿物可以保护OC和限制氧化。这就提出了一个难题，粘土形成和OC保存要么竞争，要么合作。关于它们的相对贡献仍然存在争议，因为缺乏同时探测这些过程的定量工具，而现有的工具往往没有统一衡量。在这里，我们表明，锂同位素比值的沉积物，通常用于跟踪粘土形成，可以帮助限制OC循环。从两个流域的河流悬浮沉积物的测量和分析发表的数据从夏威夷土壤剖面显示，固相δ 7 Li值和OC含量之间的负相关性，表明粘土矿物的形成与OC的积累。但δ 7 Li值和OC含量的分布范围不同，我们用成土模式进行了解释。我们发现Li同位素和OC的时间趋势对矿物溶解/粘土形成速率最敏感，其中较高的速率产生较大的OC储量和较低的δ 7 Li sol值。虽然OC增强的溶解主要决定了OC和硅酸盐矿物的周转时间，但粘土保护明显改变了土壤形成途径，并且可能需要解释观察范围。这些研究结果强调粘土矿物的形成，主要是由基岩化学和其次由气候驱动，作为风化通量和土壤中OC积累的主要调制器。
Silicate weathering and organic carbon (OC) burial in soil regulate atmospheric CO 2, but their influence on each other remains unclear. Generally, OC oxidation can generate acids that drive silicate weathering, yet clay minerals that form during weathering can protect OC and limit oxidation. This poses a conundrum where clay formation and OC preservation either compete or cooperate. Debate remains about their relative contributions because quantitative tools to simultaneously probe these processes are lacking while those that exist are often not measured in concert. Here we demonstrate that Li isotope ratios of sediment, commonly used to trace clay formation, can help constrain OC cycling. Measurements of river suspended sediment from two watersheds of varying physiography and analysis of published data from Hawaii soil profiles show negative correlations between solid-phase δ 7 Li values and OC content, indicating the association of clay mineral formation with OC accumulation. Yet, the localities differ in their ranges of δ 7 Li values and OC contents, which we interpret with a model of soil formation. We find that temporal trends of Li isotopes and OC are most sensitive to mineral dissolution/clay formation rates, where higher rates yield greater OC stocks and lower δ 7 Li s o i l values. Whereas OC-enhanced dissolution primarily dictates turnover times of OC and silicate minerals, clay protection distinctly modifies soil formation pathways and is likely required to explain the range of observations. These findings underscore clay mineral formation, driven primarily by bedrock chemistry and secondarily by climate, as a principal modulator of weathering fluxes and OC accumulation in soil.
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影响因子：
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作者：
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DOI：
--
发表时间：
1975
期刊：
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通讯作者：
Schuessler, Jan A.
DOI：
10.1029/2021jg006604
发表时间：
2022-05
期刊：
Journal of Geophysical Research: Biogeosciences
影响因子：
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作者：
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通讯作者：
C. Talbot;D. Bolster;D. Medvigy;Stuart E. Jones
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影响因子：
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作者：
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