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Long-term carbon burial in European lakes: Analysis and estimate

机译：欧洲湖泊的长期碳埋藏：分析与估算

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摘要

Sediment accumulation in lakes provides a small but permanent carbon sink. To date, global estimates of the C cycle have barely considered variations in lake carbon burial. To improve the understanding of carbon storage in lakes this study analyzed the sedimentary record of 228 European lakes concerning long-term carbon burial and its correlation to lake and catchment properties. The results suggest that carbon mass accumulations in small lakes are significantly lower than those used for global estimates so far. On the other hand, the total surface area of small lakes has been severely underestimated. Results from calculations based on a Pareto distribution show that total lake surface is 240,000 km~2 in Europe. We estimate total C burial in European lakes at 1.25 Mt yr~(-1). Half this storage takes place in boreal lakes of northern Europe, although they contribute up to 65% to the European lake surface. This is due to generally lower carbon burial rates in this region. Carbon mass accumulation rates increased in many lakes between 5000 to 2000 years BP. This coincides with increased clastic inputs due to land use change, i.e., increasing cropland coverage and soil erosion. On average, carbon accumulation rates are twice as high in younger sediments at 20 cm depth when compared to the long-term mean.
机译：湖泊中的沉积物积聚提供了一个小而永久的碳汇。迄今为止，全球对碳循环的估计几乎没有考虑到湖泊碳埋藏的变化。为了更好地了解湖泊中的碳储量，本研究分析了228个欧洲湖泊关于长期碳埋藏的沉积记录及其与湖泊和集水区特性的关系。结果表明，到目前为止，小湖中的碳质量积累量明显低于全球估算的碳积累量。另一方面，小湖的总表面积被严重低估了。根据帕累托分布的计算结果表明，欧洲的湖面总面积为240,000 km〜2。我们估计欧洲湖泊的总C埋藏量为1.25 Mt yr〜（-1）。这种存储的一半发生在北欧的北方湖泊中，尽管它们占欧洲湖泊表层的比重高达65％。这是由于该地区的碳埋藏率通常较低。在5,000至2000年BP之间的许多湖泊中，碳质积累速率都在增加。这与由于土地用途的改变，即增加耕地覆盖和水土流失而增加的碎屑投入相吻合。平均而言，与长期平均值相比，在20 cm深度处较年轻的沉积物中的碳积累速率高出一倍。

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