...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aquatic Sciences >Dissolved organic matter spectroscopy reveals a hot spot of organic matter changes at the river-reservoir boundary
【24h】

Dissolved organic matter spectroscopy reveals a hot spot of organic matter changes at the river-reservoir boundary

机译：溶解的有机物光谱揭示了河流储层边界的有机物质变化的热点

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Reservoirs show contrasting chemical and biological spatial gradients due to the strong effect of the inflowing rivers on the whole ecosystem. However, the fate of dissolved organic matter (DOM) input from rivers along the reservoir water body is still unclear. Here, we characterized the composition of DOM in the Ter River-Sau Reservoir system (Spain), located in a watershed under anthropogenic pressures (urban wastewater effluents, intensive farming, agriculture). Water samples were collected in the river several kilometers upstream of the reservoir and during its travel throughout the water body until the dam. Absorbance and fluorescence spectroscopy with parallel factor analysis (PARAFAC) was used to characterize DOM. Based on three-dimensional excitation-emission matrices (EEMs), PARAFAC produced a six-component model, most of them related to human-derived DOM and showing significant spatial trends. A component showing major influence on the overall spectroscopy signal was associated with wastewater effluents and significantly correlated with environmental variables usually linked to DOM lability. Components trends showed a major discontinuity in the vicinity of the river plunge point (river-reservoir boundary), where the composition of DOM showed noticeable changes. Upstream from the plunge point, components related to human activity dominated the spectroscopy signal, while components related to autochthonous planktonic activity appeared downstream of the plunge point. This coincided with strong heterotrophic activity as revealed by oxygen undersaturation and nutrient concentration changes. Fluorescence indices also supported a strong signature of human-derived DOM in the system and pointed to the plunge point as a likely hot spot for DOM processing.
机译：由于流入河流在整个生态系统上的强劲效果，水库表现出对比化学和生物空间梯度。然而，沿水库水体从河流输入的溶解有机物质（DOM）的命运仍然尚不清楚。在这里，我们在Ter River-Sau水库系统（西班牙）中的构成表征了位于人为压力下的流域（城市废水污水，集约化农业，农业）的流域中。将水样在水库上游的几公里内收集水样，在整个水体中的行驶期间直到大坝。具有平行因子分析（PARAFAC）的吸光度和荧光光谱用于表征DOM。基于三维激发排放矩阵（EEMS），PARAFAC产生了六组分模型，大多数与人衍生的DOM有关并显示出显着的空间趋势。显示对整体光谱信号的主要影响的组分与废水流出物相关，并与通常与DOM宽容相关的环境变量显着相关。组件趋势在河流点（河流储层边界）附近显示了一个主要的不连续性，其中DOM的组成显示出明显的变化。从漏洞点的上游，与人类活动有关的组件主导了光谱信号，而与自动浮游活动相关的组件出现在暴跌点下游。这与氧气缺氧和营养浓度的变化透露的强烈异养活性。荧光指数还支持系统中的人类衍生DOM的强烈签名，并指向PLONGE点，作为DOM处理的可能热点。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号