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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Nutrient Dynamics in Partially Drained Arctic Thaw Lakes
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Nutrient Dynamics in Partially Drained Arctic Thaw Lakes

机译：部分排水的北极冻湖中的营养动态

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Thaw lakes are ubiquitous on arctic coastal plains (ACPs). While many thaw lakes have steep banks, stable water levels, and static surface areas, others only partially fill their basins and vary in area over the summer. These partially drained lakes (PDLs) are hydrologically connected to the wetlands immediately surrounding them. Heat and nutrient availability limit aquatic productivity on ACPs, and we hypothesized that shallow shorelines and greater hydrologic connectivity with the landscape should result in greater nutrient concentrations and biogeochemical cycling in PDLs. We tested this by monitoring water chemistry in lakes with varying levels of seasonal drainage in sandy and silty peaty lowland sites on the ACP of Alaska. One highly drained lake (N1) was significantly warmer than minimally drained lakes (minDLs) related to earlier ice off, reaching temperatures as high as 16 °C in June when minDLs still contained ice. Ammonia, total dissolved phosphorus, and dissolved organic carbon and nitrogen concentrations were higher in lakes with greater drainage, and concentrations in N1 rivaled those in the small, biologically productive ponds. Many PDLs displayed a midsummer decrease in nutrients consistent with assimilation by the aquatic ecosystem, and a late-summer increase most likely related to runoff from drained lake margins following precipitation. N1 exported kilograms of ammonium and total dissolved phosphorus to the stream network over the summer. Given increased warming and drying in the arctic, the proportion of PDLs may be changing, which in turn may affect nutrient and organic matter availability in arctic lakes and export to downstream environments.
机译：在北极沿海平原（ACPS）上，湖泊普遍存在。虽然许多解冻湖泊有陡峭的银行，水平稳定的水平和静态面积，但其他人只会部分地填满他们的盆地并在夏天的区域内各不相同。这些部分排水湖泊（PDL）与立即周围的湿地进行水文连接。热量和营养可用性限制ACPS的水生成品，我们假设浅层海岸线和与景观更大的水文连接应导致PDL中更大的营养浓度和生物地球化学循环。我们通过监测湖泊水化学的水化学在阿拉斯加的ACP上的桑迪和粉质泥质斑点景点不同水平的季节性排水。一个高度排水的湖泊（N1）比早期冰的最小排出的湖泊（Mindls）显着温暖，在威严仍然含有冰的思维达到16°C的温度高达16°C。氨，总溶解的磷和溶解的有机碳和氮浓度在湖泊中较高，排水较大，N1中的浓度媲美小型生物生产池塘中的浓度。许多PDL展示了仲夏，营养成一致的营养素减少，与水生生态系统相一致，夏季增长最有可能与排水湖泊利润率的径流有关。 N1在夏季将千克铵和总溶解磷输出到流网络。在北极中增加升温和干燥，PDL的比例可能会发生变化，这反过来可能影响北极湖泊中的营养和有机物质可用性，并出口到下游环境。

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