Variable nitrate concentration-discharge relationships in a forested watershed
Variable nitrate concentration-discharge relationships in a forested watershed
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DOI：
10.1002/hyp.11136
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发表时间：
2017-04-30
影响因子：
3.2
通讯作者：
Groffman, Peter M.
中科院分区：
文献类型：
--
作者：
Duncan, Jonathan M.;Band, Lawrence E.;Groffman, Peter M.
溶质浓度与排放之间的关系可以帮助人们全面了解流域尺度的水文和生物地球化学过程。最近来自多个流域的研究表明，相对于流量的巨大变化，浓度变化通常很小。这种模式被描述为化学抑制行为。 Pond Branch 是马里兰州森林覆盖的源头集水区，14 年来，我们每周对溪流硝酸盐 (NO3-) 浓度进行监测。在2011年的生长季和秋季，使用高频光学NO3-传感器来补充长期每周数据。在此分水岭中，长期每周数据显示 NO3- 浓度随着排放量的增加而降低，而 6 个月的 15 分钟传感器观察到的浓度揭示了更趋化的行为。传感器在不同风暴事件期间收集的高频 NO3- 浓度揭示了不同的浓度-排放模式，凸显了高分辨率数据和生态水文驱动因素在控制生物反应性溶质（例如 NO3-）的溶质输出方面的重要性。
The relationship between solute concentrations and discharge can inform an integrated understanding of hydrological and biogeochemical processes at watershed scales. Recent work from multiple catchments has shown that there is typically little variation in concentration relative to large variations in discharge. This pattern has been described as chemostatic behavior. Pond Branch, a forested headwater catchment in Maryland, has been monitored for stream nitrate (NO3-) concentrations at weekly intervals for 14years. In the growing season and autumn of 2011 a high-frequency optical NO3- sensor was used to supplement the long-term weekly data. In this watershed, long-term weekly data show that NO3- concentrations decrease with increasing discharge whereas 6months of 15-minute sensor observed concentrations reveal a more chemostatic behavior. High-frequency NO3- concentrations from the sensor collected during different storm events reveal variable concentration-discharge patterns highlighting the importance of high resolution data and ecohydrological drivers in controlling solute export for biologically reactive solutes such as NO3-.