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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >An enormous amorphous silica stock in boreal wetlands
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An enormous amorphous silica stock in boreal wetlands

机译:北方湿地中大量无定形二氧化硅库存

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We investigated amorphous Si (ASi) in a boreal wetland in northern Sweden. We found enormous stocks of ASi in the upper soil layers (up to 11% of dry weight), in the form of diatom frustules and plant ASi. A consistent exponential decrease in ASi concentrations was observed with increasing depth in the soil profile. An inverse modeling approach shows that vegetation takes up a substantial part of weathered dissolved Si (DSi). Concurrent analysis of N and C indicates a faster turnover in and a higher leakage from the ASi pool. The magnitude of the biological buffering we observed is unprecedented and supports the emerging paradigm of the importance of biological uptake of DSi governing the export of DSi from terrestrial ecosystems. Our results complicate current models of silicate transport, highlighting the necessity to incorporate ecosystem biological buffering in our concept of Si biogeochemistry.
机译:我们在瑞典北部的北方湿地中研究了非晶硅(ASi)。我们在上层土壤层中发现了大量的ASi储量(高达干重的11%),形式为硅藻壳和植物ASi。随着土壤剖面深度的增加,ASi浓度呈指数下降。逆向建模方法表明,植被占据了风化溶解硅(DSi)的很大一部分。氮和碳的同时分析表明,ASi池的周转速度更快,泄漏量也更高。我们观察到的生物缓冲作用的规模是空前的,它支持了生物吸收DSi的重要性的新范式,该重要性决定着陆地生态系统中DSi的出口。我们的结果使当前的硅酸盐运移模型变得复杂,突显了将生态系统生物缓冲纳入我们的硅生物地球化学概念的必要性。

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