Coupling of reactive riverine phosphorus and iron species during hot transport moments: impacts of land cover and seasonality
Coupling of reactive riverine phosphorus and iron species during hot transport moments: impacts of land cover and seasonality
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热运输时刻河流活性磷和铁物质的耦合：土地覆盖和季节性的影响
DOI：
10.1007/s10533-016-0290-9
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发表时间：
2017
期刊：
影响因子：
4
通讯作者：
Schroth, Andrew W.
中科院分区：
文献类型：
--
作者：
Rosenberg, Braden D.;Schroth, Andrew W.
由于持续的高流量，春季径流往往是年径流量和河流磷(P)输出的主要来源，春季径流的大小可以很好地预测夏季水体有害藻华的严重程度。然而，在这段时间内，活性形态磷的负载量在时间、空间和地球化学分配上的特征仍然很差。通过比较同一流域森林和农业流域春季径流和夏季暴雨过程中溶解和悬浮泥沙P(DP)、溶解和胶体Fe、氧化还原敏感型悬浮泥沙P(RSP)和Fe的浓度、分布和时间动态，探讨了河流春季径流和夏季暴雨过程中河流溶解和悬浮泥沙P具有特别高比例的潜在活性形态和P与Fe的共生关系。RSP的主要载体是铁(氧)氢氧化物，但在春季径流和夏季暴雨期间，尤其是在融雪开始时，农业流域中的铁(氧)氢氧化物颗粒和胶体强烈地富含RSP和DP。2014年，83%的DP和74%的RSP在春季径流期间被输送到密西斯库伊湾。悬浮沉积物对氧化还原的敏感度明显高于典型的湖湖学模型输入，这表明这种负荷的反应性可能被系统性地低估了。与气候或土地覆盖变化相关的春季径流的时间、来源和严重程度的变化将对河流总磷负荷及其在接受水生态系统中的潜在反应性产生重大影响。
Spring runoff often comprises the majority of annual discharge and riverine phosphorus (P) export due to sustained high flow, and the magnitude of spring runoff can be a strong predictor of receiving water summer harmful algal bloom severity. Yet the loading of reactive forms of P during this time period remains poorly-characterized in time, space and geochemical partitioning. Here, we explore the hypothesis that riverine dissolved and suspended sediment P loads during spring runoff have a particularly high proportion of potentially reactive species due to unique hydrologic pathways and P association with iron (Fe).The concentration, distribution and temporal dynamics of dissolved P (DP), dissolved and colloidal Fe, and redox sensitive suspended sediment P (RSP) and Fe during spring runoff and summer storms were compared in forested and agricultural catchments of the same watershed. The dominant carrier of RSP was Fe (oxy)hydroxides across land cover and season, but Fe (oxy)hydroxide particles and colloids in agricultural catchments were strongly enriched in RSP and DP during spring runoff and summer storms, particularly at the onset of snowmelt. In 2014, 83% of DP and 74% of RSP were delivered to Missisquoi Bay during spring runoff. Suspended sediment was significantly more redox sensitive than typically input to limnological models, suggesting that the reactivity of this load may be systematically underestimated. Changes in the timing, provenance and severity of spring runoff associated with climate or land cover change will have dramatic impacts on total riverine P loads and their potential reactivity in receiving water ecosystems.
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DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
Liu Hong
通讯作者：
Liu Hong
DOI：
10.3133/tm4a10
发表时间：
2015
期刊：
Techniques and Methods
影响因子：
--
作者：
R. Hirsch;L. D. Cicco
通讯作者：
R. Hirsch;L. D. Cicco
美国东北部高地森林溪流硝酸盐和 DOC 负荷对水文强迫和气候变化的响应
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
S. Sebestyen;E. Boyer;J. Shanley
通讯作者：
J. Shanley
农林混合流域（西班牙西北部）在不同流动条件下排放的金属
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
F. Soto;M. Rodríguez;M. Taboada;M. T. Taboada
通讯作者：
M. T. Taboada
影响因子：
5.4
作者：
S. Sebestyen;E. Boyer;J. Shanley;C. Kendall;D. Doctor;G. Aiken;N. Ohte
通讯作者：
S. Sebestyen;E. Boyer;J. Shanley;C. Kendall;D. Doctor;G. Aiken;N. Ohte