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Increasing organic C and N fluxes from a northern boreal river basin to the sea

机译：从北部北方河流域到海洋的有机碳和氮通量增加

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摘要

Increasing trends in dissolved organic carbon (DOC) concentrations in lakes and streams across Europe and North America have been reported. The widespread occurrence of these phenomena indicates large-scale causes, e.g. enhanced decomposition of organic soils, changes in hydrology or decreased acid deposition. The Simojoki River basin (3160 km~2) is located in the Northern Boreal Zone where human impacts are minor. Long-term changes (30-40 years) of organic C and N concentrations and fluxes in the Simojoki River system were studied: both TOC and TON concentrations were increasing, fluctuating between droughts and wet periods. Highest concentrations were detected in 1998-2000 during a period of very high flows, after the drought period of 1994-1997. The average TOC flux increased by 38% during the 1990s compared with the 1980s, while the average TON flux during the same period increased even more, by 42%. Runoff accounts for part but not all of the increase in the TOC and TON outputs. Since 2000, the fluxes have decreased to slightly lower levels but year-to-year variability has remained considerable. Multiple effects are probable, i.e. changes in both hydrology and in catchment soils have impacts on these increasing fluxes.
机译：据报道，整个欧洲和北美的湖泊和溪流中溶解有机碳（DOC）浓度呈上升趋势。这些现象的广泛发生表明了大规模的原因，例如增强有机土壤的分解，改变水文状况或减少酸沉降。 Simojoki流域（3160 km〜2）位于北北方地区，对人类的影响较小。研究了Simojoki河系中有机碳，氮的浓度和通量的长期变化（30-40年）：TOC和TON浓度都在增加，在干旱和潮湿期之间波动。在1994-1997年的干旱期之后，在1998-2000年的高流量时期检测到最高浓度。与1980年代相比，1990年代的平均TOC通量增加了38％，而同期的平均TON通量则增加了42％。径流占TOC和TON输出增加的一部分，但不是全部。自2000年以来，通量已降低至略低的水平，但逐年变化仍然很大。可能有多种影响，即水文和流域土壤的变化都会对这些不断增加的通量产生影响。

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