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首页> 外文期刊>Estuarine Coastal and Shelf Science >Historical reconstruction of mangrove expansion in the Gulf of Mexico: Linking climate change with carbon sequestration in coastal wetlands
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Historical reconstruction of mangrove expansion in the Gulf of Mexico: Linking climate change with carbon sequestration in coastal wetlands

机译：墨西哥湾红树林扩张的历史重建：将气候变化与沿海湿地的固碳联系起来

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摘要

There has been considerable interest in a recently recognized and important sink in the global carbon pool, commonly referred to as "blue carbon". The major goal of this study was to determine the historical reconstruction of mangrove expansion (Avicennia germinans) into salt marshes (Spartina altemiflora) and its effects on carbon sequestration and soil chemistry in wetland soils of the northwestern Gulf of Mexico. We used bulk stable isotopic, chemical biomarker analyses, and aerial imagery analysis to identify changes in OC wetland sources, and radiotracers (~(137)Cs and ~(210)Pb) for chronology. Soil cores were collected at two sites at Port Aransas, Texas (USA), Harbor Island and Mud Island. Stable isotopic values of δ~(13)C and δ~(15)N of all soil samples ranged from -26.8 to -15.6‰ and 1.8-10.4‰ and showed a significant trend of increasing depletion for each isotope from bottom to surface soils. The most depleted δ~(13)C values were in surface soils at the Mud Island (Mangrove 2) location. Carbon sequestration rates were greater in mangroves and for the Mud Island Mangrove 1 and the Marsh 1 sites ranged from 253 to 270 and 101-125 g C m~(-2) yr~(-1), respectively. Lignin storage rates were also greater for mangrove sites and for the Mud Island Mangrove 1 and the Marsh 1 ranged from 19.5 to 20.1 and 16.5 to 12.8 g lignin m~(-2) yr~(-1), respectively. The ∧_8and ∧_6 values for all cores ranged from 0.5 to 21.5 and 0.4 to 16.5, respectively, and showed a significant increase from bottom to surface sediments. If regional changes in the Gulf of Mexico are to persist and much of the marsh vegetation was to be replaced by mangroves, there could be significant increases on the overall storage and sequestration of carbon in the coastal zone.
机译：人们对全球碳池中最近被认可的重要汇（通常称为“蓝色碳”）存有极大兴趣。这项研究的主要目的是确定红树林扩张（Avicennia Germinans）到盐沼（Spartina altemiflora）的历史重建及其对墨西哥湾西北部湿地土壤中碳固存和土壤化学的影响。我们使用了大量稳定的同位素，化学生物标记分析和航空影像分析来确定OC湿地源的变化以及放射性示踪剂（〜（137）Cs和〜（210）Pb）的年代。在美国德克萨斯州阿兰萨斯港，海港岛和泥岛的两个地点收集了土壤核心。所有土壤样品的δ〜（13）C和δ〜（15）N的稳定同位素值在-26.8至-15.6‰和1.8-10.4‰之间，并且显示出从底部土壤到表层土壤的每种同位素的消耗增加的显着趋势。 δ〜（13）C值最大的是泥岛（红树林2）处的表层土壤。红树林中的碳固存率更高，而泥岛红树林1和沼泽1的碳封存率分别为253至270和101-125 g C m〜（-2）yr〜（-1）。红树林场所的木质素存储率也更高，泥岛红树林1和沼泽1的木质素存储率分别为19.5至20.1 g和16.5至12.8 g木质素m〜（-2）yr〜（-1）。所有岩心的∧_8和∧_6值分别在0.5至21.5和0.4至16.5范围内，并显示从底部到表面的沉积物显着增加。如果要继续在墨西哥湾进行区域变化，并用红树林代替大部分沼泽植被，那么沿海地区碳的总体储存和封存可能会大大增加。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第1期|7-16|共10页
  • 作者

    Thomas S. Bianchi; Mead A. Allison; Jun Zhao; Xinxin Li; Rebecca S. Comeaux; Rusty A. Feagin; R. Wasantha Kulawardhana;

  • 作者单位

    Texas A&M University, Department of Oceanography, College Station, 403AB Eller O&M Building, 3146 TAMU, TX 77843-3146, USA;

    Institute for Geophysics, University of Texas at Austin, Austin, TX 78758-4445, USA;

    Texas A&M University, Department of Oceanography, College Station, 403AB Eller O&M Building, 3146 TAMU, TX 77843-3146, USA;

    Texas A&M University, Department of Oceanography, College Station, 403AB Eller O&M Building, 3146 TAMU, TX 77843-3146, USA;

    Institute for Geophysics, University of Texas at Austin, Austin, TX 78758-4445, USA;

    Department of Ecosystem Science & Management, Texas A&M University, College Station, TX 77845, USA;

    Department of Ecosystem Science & Management, Texas A&M University, College Station, TX 77845, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    coastal wetlands; climate change; carbon sequestration; biomarkers; Gulf of Mexico;

    机译：沿海湿地;气候变化;碳汇;生物标志物墨西哥湾;

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