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Water renewal along the aquatic continuum offsets cumulative retention by lakes : implications for the character of organic carbon in boreal lakes

机译：沿水连续体的水更新抵消了湖泊的累积滞留：对北方湖泊有机碳特征的影响

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The character of organic carbon (OC) in lake waters is strongly dependent on the time water has spent in the landscape as well as in the lake itself due to continuous biogeochemical OC transformation processes. A common view is that upstream lakes might prolong the water retention in the landscape, resulting in an altered OC character downstream. We calculated the number of lakes upstream for 24,742 Swedish lakes in seven river basins spanning from 56º to 68º N. For each of these lakes, we used a lake volume to discharge comparison on a landscape scale to account for upstream water retention by lakes (Tn tot). We found a surprisingly weak relationship between the number of lakes upstream and Tn tot. Accordingly, we found that the coloured fraction of organic carbon was not related to lake landscape position but significantly related to Tn tot when we analysed lake water chemical data from 1,559 lakes in the studied river basins. Thus, we conclude that water renewal along the aquatic continuum by lateral water inputs offsets cumulative retention by lakes. Based on our findings, we suggest integrating Tn tot in studies that address lake landscape position in the boreal zone to better understand variations in the character of organic carbon across lake districts.
机译：由于连续的生物地球化学OC转化过程，湖水中的有机碳（OC）的特性很大程度上取决于水在景观中以及湖中所花费的时间。常见的观点是上游湖泊可能会延长景观中的水分保留，从而导致下游OC特性发生变化。我们计算了从56º到68ºN的七个流域中24,742处瑞典湖泊的上游湖泊数量。对于这些湖泊中的每一个，我们使用湖泊量进行景观规模比较，以说明湖泊上游的保水量（Tn tot）。我们发现上游湖泊数量与Tn tot之间的关系出乎意料的弱。因此，当我们分析所研究流域的1,559个湖泊的湖泊水化学数据时，我们发现有机碳的有色成分与湖泊景观位置无关，而与Tn tot显着相关。因此，我们得出的结论是，通过侧向水输入而沿水生连续体更新的水抵消了湖泊的累积滞留。根据我们的发现，我们建议将Tn tot整合到研究北方地区湖泊景观位置的研究中，以更好地了解整个湖泊地区有机碳特征的变化。

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