深耕森林和农田土壤中埋藏碳的稳定性-对碳储量的影响。,Scientific Reports

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深耕森林和农田土壤中埋藏碳的稳定性-对碳储量的影响。
Scientific Reports ( IF 3.8 ) Pub Date : 2017-07-14 , DOI: 10.1038/s41598-017-05501-y
Viridiana Alcántara , Axel Don , Lars Vesterdal , Reinhard Well , Rolf Nieder

土壤有机碳（SOC）的积累可能在减缓和适应气候变化中发挥关键作用。特别地，由于假定的地下土壤SOC更高的稳定性，地下土壤为额外的SOC存储提供了巨大的潜力。SOC到达地下的最快方式是通过埋葬，例如通过侵蚀或深耕。我们评估了深耕对SOC的长期埋藏对长期SOC储量以及森林和农田地基土壤稳定性的影响。25-48年后，在森林土壤（+ 48％）和农田（+ 67％）中，深耕地基土壤的SOC均显着高于参考地基土壤。但是，深耕土壤中低至100 cm的总SOC储量仅在农田而非森林中大于参考土壤。造成这种现象的原因是深耕的森林土壤表层土壤中的SOC积累较慢。长期孵育显示，埋藏的SOC平均比参考SOC稳定32％。而且，地下土壤的SOC具有较高的表观放射性碳年龄，这表明它与大气CO的交换很大程度上是隔离的。₂。我们得出的结论是，深耕增加了地下土壤SOC的存储量，并且较高的地下土壤SOC稳定性不仅是选择性保存更稳定的SOC组分的结果。

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Stability of buried carbon in deep-ploughed forest and cropland soils - implications for carbon stocks.

Accumulation of soil organic carbon (SOC) may play a key role in climate change mitigation and adaptation. In particular, subsoil provides a great potential for additional SOC storage due to the assumed higher stability of subsoil SOC. The fastest way in which SOC reaches the subsoil is via burial, e.g. via erosion or deep ploughing. We assessed the effect of active SOC burial through deep ploughing on long-term SOC stocks and stability in forest and cropland subsoil. After 25-48 years, deep-ploughed subsoil contained significantly more SOC than reference subsoils, in both forest soil (+48%) and cropland (+67%). However, total SOC stocks down to 100 cm in deep-ploughed soil were greater than in reference soil only in cropland, and not in forests. This was explained by slower SOC accumulation in topsoil of deep-ploughed forest soils. Buried SOC was on average 32% more stable than reference SOC, as revealed by long-term incubation. Moreover, buried subsoil SOC had higher apparent radiocarbon ages indicating that it is largely isolated from exchange with atmospheric CO₂. We concluded that deep ploughing increased subsoil SOC storage and that the higher subsoil SOC stability is not only a result of selective preservation of more stable SOC fractions.

更新日期：2017-07-14

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