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首页> 外文期刊>Estuarine Coastal and Shelf Science >Elucidating terrestrial nutrient sources to a coastal lagoon, Chincoteague Bay, Maryland, USA
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Elucidating terrestrial nutrient sources to a coastal lagoon, Chincoteague Bay, Maryland, USA

机译:向美国马里兰州钦科蒂格湾的沿海泻湖阐明陆地营养源

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摘要

Long-term non-linear ecosystem-scale changes in water quality and biotic communities in coastal lagoons have been associated with intensification of anthropogenic pressures. In light of incipient changes in Johnson Bay (an embayment of Chincoteague Bay, Maryland-Virginia, USA), examination of nitrogen sources was conducted through synoptic water quality monitoring, stable nitrogen isotope signatures (δ~(15)N) of in situ bioindicators, and denitrification estimates. These data were placed in the context of long-term and broader spatial analyses. Despite various watershed protection efforts, multiyear summer time studies (2004-2007) suggested that high levels of terrestrially derived nutrients still enter Johnson Bay. Total nitrogen concentrations in Johnson Bay were 132% the concentrations in the broader Chincoteague Bay during the late 1970s (mean 2004-2007 was 40.0 - 73.2 μM). Comparing total nitrogen concentrations in Johnson Bay to St. Martin River (consistently the most eutrophic region of these coastal bays), Johnson Bay has increased from 62.5% to 82.5% of the concentrations in St. Martin River during the late 1970s. Though specific sources of nitrogen inputs have not yet been definitively identified, the long-term increase in total nitrogen concentrations occurred despite increased and continued conservation and protection measures. We suggest that investigating nutrient sources can reveal potentially ineffective nutrient policies and that this knowledge can be applied towards other coastal lagoons.
机译:沿海泻湖中水质和生物群落的长期非线性生态系统规模变化与人为压力的加剧有关。鉴于约翰逊湾(美国马里兰州-弗吉尼亚州Chincoteague湾的一个收容所)的初期变化,通过天气水质监测,原位生物指示剂的稳定氮同位素特征(δ〜(15)N)进行了氮源检查。以及反硝化估算值。这些数据被放在长期和广泛的空间分析的背景下。尽管采取了各种分水岭保护措施,但多年的夏季研究(2004-2007年)表明,大量的陆生营养素仍进入约翰逊湾。在1970年代后期,约翰逊湾的总氮浓度为整个Chincoteague湾的132%(2004-2007年平均为40.0-73.2μM)。比较约翰逊湾和圣马丁河(一直是这些沿海海湾中最富营养的区域)中的总氮浓度,约翰逊湾在1970年代后期已从圣马丁河中的总氮浓度的62.5%增加到82.5%。尽管尚未确切确定氮输入的具体来源,但是尽管采取了更多和持续的保护和保护措施,总氮浓度仍出现了长期增加。我们建议调查养分来源可以揭示潜在的无效养分政策,并且该知识可以应用于其他沿海泻湖。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第1期|1-10|共10页
  • 作者单位

    Integration and Application Network, University of Maryland Center for Environmental Science, Annapolis, MD, USA,Institute of Marine and Coastal Sciences, Rutgers University, The State University of New Jersey, 71 Dudley Rd., New Brunswick, NJ 08903, USA;

    Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, USA;

    Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, USA;

    Maryland Coastal Bays Program, National Estuary Program, Ocean City, MD, USA;

    Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, USA,Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA;

    Integration and Application Network, University of Maryland Center for Environmental Science, Annapolis, MD, USA,Secretariat of the Pacific Regional Environment Programme, Apia, Samoa;

    Integration and Application Network, University of Maryland Center for Environmental Science, Annapolis, MD, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    coastal lagoons; nitrogen; anthropogenic factors; water quality; land use; maryland; chincoteague bay;

    机译:沿海泻湖;氮;人为因素;水质;土地利用;马里兰钦科蒂格湾;

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