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首页> 外文期刊>Water Research >Spatial patterns in dissolved organic matter composition controlled by watershed characteristics in a coastal river network: The Neuse River Basin, USA
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Spatial patterns in dissolved organic matter composition controlled by watershed characteristics in a coastal river network: The Neuse River Basin, USA

机译：受沿海河网分水岭特征控制的溶解有机物组成的空间格局：美国Neuse流域

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The effect of watershed characteristics (land use land cover and morphology) on spatial variability in dissolved organic matter (DOM) composition, and concentrations of dissolved organic carbon [DOC] and nitrogen [DON] was assessed in a coastal river basin draining into Pamlico Sound in eastern North Carolina, USA. Understanding the factors that influence DOM concentration and composition i.e., structurally complex molecules with high molecular weight versus low molecular weight, simple molecules can provide insights on DOM cycling and water composition implications. Such information is imperative for large coastal river networks undergoing rapid and intense land use and land cover (LULC) changes. DOM composition was estimated using optical indices calculated from DOM absorbance and fluorescence measurements. DOM was derived from terrestrial sources, and ordination analysis indicated that LULC, in particular, % wetland area was the most significant control on DOM composition and concentration. Wetland and agricultural coastal streams were abundant in humic and complex DOM, whereas forested and urban streams were least abundant in humic DOM. We speculate that greater availability of mobilizable DOM in wetland and agricultural watersheds contributed to this observation. In comparison, mixed urbanized and forested streams in North Carolina's Piedmont region were abundant in [DOC], less complex, low molecular weight DOM, as well as greater amounts [DON] due to higher urban runoff and elevated DOM production in these streams. Our results indicated that physiographic transition from Piedmont to coastal plain and varying LULC influenced the spatial variability in DOM composition and concentration. Our findings highlight that increasing anthropogenic alterations might increase the abundance of reactive DOM in coastal rivers and estuaries resulting in severe water quality issues. This information is important for monitoring and developing land use policies. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在流入帕姆利科海峡的沿海流域，评估了流域特征（土地利用的土地覆盖和形态）对溶解有机物（DOM）组成的空间变异以及溶解有机碳[DOC]和氮[DON]浓度的影响。在美国北卡罗来纳州东部。了解影响DOM浓度和组成的因素（即高分子量与低分子量的结构复杂的分子），简单的分子可以提供有关DOM循环和水成分含义的见解。对于正在经历快速而紧张的土地利用和土地覆被（LULC）变化的大型沿海河网，此类信息至关重要。使用从DOM吸光度和荧光测量值计算得出的光学指数估算DOM组成。 DOM来源于陆地，排序分析表明，LULC（尤其是湿地面积百分比）是对DOM组成和浓度的最重要控制。在湿润和复杂的DOM中，湿地和农业沿海河流丰富，而在湿润DOM中，森林和城市河流最少。我们推测，在湿地和农业流域中可移动DOM的更大可用性有助于这一观察。相比之下，北卡罗莱纳州皮埃蒙特地区的城市化和森林混合溪流富含[DOC]，复杂程度较低，低分子量DOM，并且由于这些溪流中较高的城市径流量和DOM产量增加而使[DON]含量较高。我们的结果表明，从皮埃蒙特到沿海平原的生理转变以及不同的LULC影响了DOM组成和浓度的空间变异性。我们的发现强调，人为改变的增加可能会增加沿海河流和河口中反应性DOM的含量，从而导致严重的水质问题。此信息对于监视和制定土地使用政策很重要。 （C）2019 Elsevier Ltd.保留所有权利。

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