Relative linkages of stream water quality and environmental health with the land use and hydrologic drivers in the coastal‐urban watersheds of southeast Florida
Relative linkages of stream water quality and environmental health with the land use and hydrologic drivers in the coastal‐urban watersheds of southeast Florida
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DOI：
10.1002/2017gh000058
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发表时间：
2017-06
期刊：
影响因子：
4.8
通讯作者：
O. Abdul‐Aziz;Shakil Ahmed
中科院分区：
文献类型：
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作者：
O. Abdul‐Aziz;Shakil Ahmed
系统的数据分析，以确定溪流水质和环境健康的相对联系与土地利用和水文驱动器在东南佛罗里达沿海城市流域。开发了基于幂律的偏最小二乘回归模型，以通过适当解决多重共线性（Nash-Sutcliffe效率= 0.72-0.95）可靠地估计联系。分析表明，大沼泽地是潮湿（6月至10月）和干燥（11月至5月）季节沿海城市河流中总氮（TN）的外部和最大来源。“外部驱动器”表现出1.5-2倍强的控制流TN比流域的“土地利用”，“水文”和“上游河段”的贡献。相比之下，大沼泽地似乎是一个次要的来源，在流总磷（TP），这主要是由内部流域过程控制。TP是最密切相关的上游河段浓度和流域土地利用在雨季和旱季，分别。尽管研究区域的主要建筑部分（74%），农业用地是河流营养物质的最重要的流域来源。藻类生物量（叶绿素a）与驱动因子的联系表明TP是限制性营养盐。河流溶解氧是最强烈的影响，邻近的地下水深度和流域土地利用，分别在雨季和旱季。估计的相对联系和见解将是有用的，以确定管理目标和优先事项，以实现健康的沿海城市河流生态系统在东南佛罗里达和世界各地。
A systematic data analytics was employed to determine the relative linkages of stream water quality and environmental health with the land use and hydrologic drivers in the coastal‐urban watersheds of southeast Florida. Power law‐based partial least squares regression models were developed to reliably estimate the linkages by appropriately resolving multicollinearity (Nash‐Sutcliffe efficiency = 0.72–0.95). The analytics indicated Everglades as the external and the largest source of total nitrogen (TN) in the coastal‐urban streams for both wet (June–October) and dry (November–May) seasons. The “external driver” exhibited 1.5–2 times stronger control on stream TN than that of the watershed “land use,” “hydrology,” and the “upstream reach” contributions. In contrast, Everglades appeared to be a minor source of in‐stream total phosphorus (TP), which was predominantly controlled by the internal watershed processes. TP was most strongly linked with the upstream reach concentrations and watershed land uses in the wet and dry seasons, respectively. Despite the predominantly built‐up fraction (74%) of the study area, agricultural land was the most substantial watershed source of in‐stream nutrients. The linkages of algal biomass (Chl a) with the drivers indicated TP as the limiting nutrient. Stream dissolved oxygen was most strongly influenced by the adjacent groundwater depth and watershed land uses, respectively, in the wet and dry seasons. The estimated relative linkages and insights would be useful to identify the management targets and priorities to achieve healthy coastal‐urban stream ecosystems in southeast Florida and around the world.