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The Effect of Open Marsh Water Management Practices on the Carbon Balance of Tidal Marshes in Barnegat Bay, New Jersey

机译：沼泽水管理实践对新泽西州Barnegat湾潮汐沼泽碳平衡的影响

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摘要

Salt marshes have been modified for mosquito control since the early 1900s. Open marsh water management (OMWM) is a mosquito control technique first applied in New Jersey in the 1950s. It has been extensively used in the mid-Atlantic and also in Massachusetts, New York, Connecticut, Florida, and Louisiana. This practice involves excavation of areas of marsh, constructing shallow ponds to provide habitat for mosquito larvae-eating fish with the goal of reducing mosquito populations. Nearly half of Barnegat Bay, New Jersey's coastal marshes have been subject to OMWM since 1976, and its effects on ecosystem function are not well understood. Here, we assess the impacts of OMWM on the carbon balance of salt marshes associated with the conversion of intact vegetation to open water ponds. Using a precise object-based image analysis classification technique, we found that over 7,000 ponds, approximately 3% of Barnegat Bay's coastal marshes, have been constructed for mosquito control. Using state of the art IR technology to examine in-situ greenhouse gas fluxes in Barnegat Bay, we found evidence to suggest that the conversion from intact plants to open water ponds negatively shifted the carbon balance of the salt marsh, both within the footprint of the constructed pond as well as within the area where deposition of sediment has prevented the recolonization of marsh vegetation. We conclude that this management technique has significantly reduced the carbon sequestration capacity of Barnegat Bay's tidal wetlands.
机译：自1900年代初以来，盐沼已经过改装，可以控制蚊子。开放式沼泽水管理（OMWM）是一种防蚊技术，最早于1950年代在新泽西州应用。它已在大西洋中部以及马萨诸塞州，纽约，康涅狄格州，佛罗里达州和路易斯安那州广泛使用。这种做法包括开挖沼泽地，建造浅塘，为食蚊幼虫提供栖息地，目的是减少蚊虫种群。自1976年以来，新泽西州Barnegat湾近一半的沿海沼泽地都受到了OMWM的管理，其对生态系统功能的影响尚不清楚。在这里，我们评估了OMWM对与完整植被转换为开放水塘相关的盐沼碳平衡的影响。使用精确的基于对象的图像分析分类技术，我们发现已建造了7,000多个池塘，用于控制蚊子，大约占Barnegat湾沿海沼泽地的3％。使用最先进的红外技术检查Barnegat湾的原地温室气体通量，我们发现证据表明，从完整的植物向开放水塘的转化对盐沼的碳平衡产生了负面影响，这两个变化都在盐沼的足迹内。人工池塘以及沉积物沉积阻止了沼泽植被重新定殖的地区。我们得出的结论是，这种管理技术已大大降低了Barnegat湾潮汐湿地的固碳能力。

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  • 作者

    Powell, Elisabeth Brighton.;

  • 作者单位

    Drexel University.;

  • 授予单位 Drexel University.;
  • 学科 Environmental science.;Remote sensing.
  • 学位 M.S.
  • 年度 2018
  • 页码 51 p.
  • 总页数 51
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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