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首页> 外文期刊>Estuarine Coastal and Shelf Science >Potential N processing by southern Everglades freshwater marshes: Are Everglades marshes passive conduits for nitrogen?
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Potential N processing by southern Everglades freshwater marshes: Are Everglades marshes passive conduits for nitrogen?

机译：南部大沼泽地淡水沼泽地的潜在氮处理：大沼泽地沼泽地是被动的氮气管道吗？

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摘要

The degree of hydrological connectivity in wetlands plays a vital role in determining the flux of energy, material, and nutrients across these wet landscapes. During the last century, compartmentalization of hydrologic flows in the Florida Everglades by canals and levees has had a profound impact on the natural timing and supply of freshwater and nutrients across the southern Everglades. Nitrogen (N) is an understudied nutrient in the phosphorus-limited Everglades; it plays an important role in many Everglades processes. To gain a better understanding of the overall N-dynamics in southern Everglades' marshes and the role that canals play in the distribution of N across this landscape, we analyzed δ ~(15)N natural abundance data for the primary ecosystem components (the macrophyte Cladium jamaicense, marl soils, peat soils, and periphyton). Three sample transects were established in the three main basins of the southern Everglades: Shark River Slough, Taylor Slough, and the C-lll basin. Each transect included sample sites near canal inflows, in interior marshes, and at the estuarine ecotone. Natural abundance δ ~(15)N signatures provided insights into processes that may be enriching the ~(15)N content of ecosystem components across the marsh landscape. We also conducted a combined analysis of δ ~(15)N data, tissue N concentrations, and water column N data to provide a broad overview of N cycling in the freshwater marshes of the southern Everglades. The primary trend that emerged from each basin was a significant ~(15N enrichment of all ecosystem components at near-canal sites, relative to more downstream sample sites. These data suggest that the phosphorus-limited marshes of the southern Everglades are not inactive conduits for N. Rather, these marshes appear to be actively cycling and processing N as it flows from the canal-marsh interface through downstream freshwater marshes. This finding has important implications to downstream coastal estuaries, including Florida Bay, and to nearshore coastal ocean ecosystems, such as coral reefs, where N is the limiting nutrient.
机译：湿地的水文连通度在确定这些湿地景观的能量，物质和养分通量方面起着至关重要的作用。在上个世纪中，通过运河和堤坝将佛罗里达大沼泽地的水文流量分隔开，对整个大沼泽地南部的自然时间以及淡水和养分的自然供应产生了深远的影响。氮（N）在磷含量有限的大沼泽地中是一种未被充分研究的营养素。它在许多大沼泽地的过程中起着重要的作用。为了更好地了解南部大沼泽地沼泽地的整体N动力学以及运河在该景观中N的分布中所扮演的角色，我们分析了主要生态系统组成部分（大型植物）的δ〜（15）N自然丰度数据。占卜（Cladium jamaicense），泥土，泥炭土和附生植物）。在南部大沼泽地的三个主要盆地中建立了三个样带：鲨鱼河泥沼，泰勒泥沼和C-III盆地。每个样带都包括靠近运河入口，内部沼泽和河口过渡带的采样点。自然丰度δ〜（15）N签名提供了对可能丰富整个沼泽地生态系统组件〜（15）N含量的过程的见解。我们还对δ〜（15）N数据，组织N浓度和水柱N数据进行了组合分析，以全面概述大沼泽地南部淡水沼泽中N的循环。每个流域出现的主要趋势是，相对于更多下游采样点，近运河站点的所有生态系统成分均显着〜15N富集。这些数据表明，南部大沼泽地的限磷沼泽地不是非活动的导管。相反，这些沼泽似乎是在积极地循环和处理N，因为它从运河-沼泽界面流经下游淡水沼泽，这一发现对包括佛罗里达湾在内的下游沿海河口以及近岸沿海海洋生态系统都具有重要意义。作为珊瑚礁，其中N是限制性营养素。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2012年第1期|p.60-68|共9页
  • 作者

    Jeffrey R. Wozniak; William T. Anderson; Daniel L Childers; Evelyn E. Gaiser; Christopher J. Madden; David T. Rudnick;

  • 作者单位

    Texas Research Institute for Environmental Studies, Sam Houston State University, 2424 Sam Houston Ave, Huntsville, TX 77340, USA;

    Southeast Environmental Research Center, Florida International University, Miami, FL 33199, USA,Earth and Environment Department, Florida International University, Miami, FL 33199, USA;

    School of Sustainability, Arizona State University, Tempe, AZ 85287, USA;

    Southeast Environmental Research Center, Florida International University, Miami, FL 33199, USA,Department of Biological Sciences, Florida International University, Miami, FL 33199, USA;

    Everglades Division, South Florida Water Management District, 3301 Gun Club Road, West Palm Beach, FL 33416, USA;

    Everglades Division, South Florida Water Management District, 3301 Gun Club Road, West Palm Beach, FL 33416, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    ~(15)N freshwater flow; hydrological restoratior; marl soils; nitrogen cycle; oligotrophic; peat soils; periphyton;

    机译：〜（15）N淡水流量;水文修复泥土氮循环贫营养的泥炭土浮游生物;

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