• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aquatic Sciences >Impact of tributary DOM and nutrient inputs on the nearshore ecology of a large, oligotrophic lake (Georgian Bay,Lake Huron, Canada)
【24h】

Impact of tributary DOM and nutrient inputs on the nearshore ecology of a large, oligotrophic lake (Georgian Bay,Lake Huron, Canada)

机译：支流DOM和养分输入对大型贫营养湖泊（加拿大休伦湖乔治湾）近岸生态的影响

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

Two adjacent bays in a large oligotrophic lake (Georgian Bay, Lake Huron) were compared to determine how the inputs from relatively pristine, but moderately humic, tributaries may influence phytoplankton, nutrients and system metabolism. Dissolved organic carbon (DOC) concentrations decreased from 4 to 5 gC m~(-3) at inner sites to 2 gC m~(-3) or less at outer sites. The concentration gradient from inner to outer was greater in the bay with a major tributary, and optical properties (intensity and slope of light absorption spectrum) showed there was a loss of material with allochthonous characteristics along the gradient. Chlorophyll a (Chl a) and total phosphorus (TP) were also higher at inner (2-4 mg Chi a m~(-3) and 8-12 mgP m~(-3), respectively) than outer sites (<1 mg Chll a m~(-3)and 4-5 mgP m~(-3)). Chl a and TP, as well as par-ticulate nutrient ratios (C:P, C:N, N:P), indicated significant eutrophication at inner sites, especially in the bay with the tributary, and there was a strong positive Chl a-phosphorus relationship. The stable oxygen isotope ratio (I8~O:16~O) of dissolved oxygen indicated greater influence of biological oxygen fluxes at inner sites (where ratios were 2-3 ppt below atmospheric equilibrium) than at outer sites (where ratios were within 0.5 ppt of equilibrium). Community photosynthesis:respiration ratios inferred from 18~O:16~O varied positively with Chl a and inorganic nutrients, but negatively with DOC. Altered loading of allochthonous organic matter can be expected under changing climate and development scenarios and will have significant influence on optical properties and system metabolism through changes in DOC in this coastal system. The effects will nonetheless be strongly modulated by any accompanying change in inorganic nutrients.
机译：比较了一个大型贫营养湖（乔治亚湾，休伦湖）中的两个相邻海湾，以确定相对原始但相对腐殖质的支流的输入如何影响浮游植物，营养物质和系统代谢。溶解的有机碳（DOC）浓度从内部站点的4 gC m〜（-3）降低到外部站点的2 gC m〜（-3）或更低。在具有主要支流的海湾中，从内部到外部的浓度梯度更大，并且光学特性（光吸收谱的强度和斜率）显示沿该梯度损失了具有异源特性的物质。内部的叶绿素a（Chl a）和总磷（TP）也较高（<1 mg，分别为2-4 mg Chi am〜（-3）和8-12 mgP m〜（-3））。 Chll am〜（-3）和4-5 mgP m〜（-3））。 Chl a和TP以及微粒养分比（C：P，C：N，N：P）表明内部地点（特别是在带有支流的海湾中）明显富营养化，并且Chl a呈强阳性-磷的关系。溶解氧的稳定氧同位素比（I8〜O：16〜O）表明，内部场所（比率比大气平衡低2-3 ppt）对生物氧气通量的影响大于外部场所（比率在0.5 ppt以内）平衡）。从18〜O：16〜O推断的群落光合作用：呼吸比与Chla和无机养分呈正相关，而与DOC呈负相关。在不断变化的气候和发展情景下，预计异源有机物的装载量会发生变化，并将通过该沿海系统中DOC的变化对光学性质和系统代谢产生重大影响。尽管如此，无机养分的任何伴随变化都会强烈地调节这种作用。

著录项

  • 来源
    《Aquatic Sciences》 |2013年第2期|321-332|共12页
  • 作者

    Serghei A. Bocaniov; David R. Barton; Sherry L. Schiff; Ralph E. H. Smith;

  • 作者单位

    Department of Biology, University of Waterloo, Waterloo, ON, Canada,Department of Lake Research, Helmholtz Centre for Environmental Research-UFZ, Brueckstrasse 3a,39114 Magdeburg, Germany;

    Department of Biology, University of Waterloo, Waterloo, ON, Canada;

    Department of Earth and Environmental Sciences,University of Waterloo, Waterloo, ON, Canada;

    Department of Biology, University of Waterloo, Waterloo, ON, Canada;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    dissolved organic matter; lake metabolism; oxygen; nearshore eutrophication;

    机译：溶解的有机物湖泊新陈代谢;氧;近岸富营养化;

相似文献

  • 外文文献
  • 中文文献
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