Minerogenic salt marshes can function as important inorganic carbon stores
Minerogenic salt marshes can function as important inorganic carbon stores
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DOI：
10.1002/lno.12322
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发表时间：
2023-03
影响因子：
4.5
通讯作者：
P. Mueller;L. Kutzbach;Thomas J. Mozdzer;Emil Jespersen;D. Barber;Franziska Eller
中科院分区：
文献类型：
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作者：
P. Mueller;L. Kutzbach;Thomas J. Mozdzer;Emil Jespersen;D. Barber;Franziska Eller
土壤无机碳的储量和通量长期以来一直被忽视的背景下，沿海固碳，其影响的气候冷却效应的蓝碳生态系统是复杂的。在这里，我们调查了土壤无机碳在欧洲瓦登海北方海岸沿着五个盐沼中的作用，瓦登海是世界上最大的潮间带之一，占欧洲盐沼面积的20%。我们证明了无机碳（平均：29%;范围：7-57%）的总土壤碳储量的顶部1米的实质性贡献。值得注意的是，无机超过有机碳储量的研究地点之一，我们归因于网站的地貌特征，如接近海洋碳酸钙来源和水动力暴露的发现。与我们的假设相反，无机碳储量将沿着从潮滩到高沼泽的演替梯度下降，因为碳酸盐沉积物将逐渐溶解在越来越富含有机物的根沉积物中，我们的研究结果表明相反的模式-无机碳储量沿着演替梯度增加。这表明根区碳酸钙的溶解被其他过程抵消，如沼泽植被对沉积碳酸盐的捕获和厌氧底土中的碳酸钙沉淀。在蓝碳的背景下，提高对碳酸钙循环中这些植物和微生物群介导的过程的理解至关重要。
Stocks and fluxes of soil inorganic carbon have long been ignored in the context of coastal carbon sequestration, and their implications for the climate cooling effect of blue carbon ecosystems are complex. Here, we investigate the role of soil inorganic carbon in five salt marshes along the northern coast of the European Wadden Sea, one of the world's largest intertidal areas, harboring ~ 20% of European salt‐marsh area. We demonstrate a substantial contribution of inorganic carbon (average: 29%; range: 7–57%) to the total soil carbon stock of the top 1 m. Notably, inorganic exceeded organic carbon stocks in one of the studied sites; a finding that we ascribe to site geomorphic features, such as proximity to marine calcium carbonate sources and hydrodynamic exposure. Contrary to our hypothesis that inorganic carbon stocks would decline along the successional gradient from tidal flat to high marsh, as carbonate deposits would progressively dissolve in increasingly organic‐rich rooted sediments, our findings demonstrate the opposite pattern—an increase in inorganic carbon stocks along the successional gradient. This suggests that the dissolution of calcium carbonates in the root zone is counterbalanced by other processes, such as trapping of sedimentary carbonates by marsh vegetation and calcium carbonate precipitation in anaerobic subsoils. In the context of blue carbon, it will be critical to develop an improved understanding of these plant‐ and microbiota‐mediated processes in calcium carbonate cycling.