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首页> 外文期刊>Estuarine Coastal and Shelf Science >Temporal changes in physical, chemical and biological sediment parameters in a tropical estuary after mangrove deforestation
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Temporal changes in physical, chemical and biological sediment parameters in a tropical estuary after mangrove deforestation

机译：红树林砍伐后热带河口物理，化学和生物沉积物参数的时间变化

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摘要

Dated sediment cores taken near the head and mouth of a tropical estuary, Nha-Phu/Binh Cang, in south central Viet Nam were analyzed for changes over time in physical, chemical and biological proxies potentially influenced by removal of the mangrove forest lining the estuary. A time-series of satellite images was obtained, which showed that the depletion of the mangrove forest at the head of the estuary was relatively recent. Most of the area was converted into aquaculture ponds, mainly in the late 1990's. The sediment record showed a clear increase in sedimentation rate at the head of the estuary at the time of mangrove deforestation and a change in diatom assemblages in the core from the mouth of the estuary indicating an increase in the water column turbidity of the entire estuary at the time of the mangrove deforestation. The proportion of fine-grained sediment and the δ~(13)C signal both increased with distance from the head of the estuary while the carbon content decreased. The nitrogen content and the δ~(15)N signal were more or less constant throughout the estuary. The proportion of fine-grained material and the chemical proxies were more or less stable over time in the core from the mouth while they varied synchronously over time in the core from the head of the estuary. The sediment proxies combined show that mangrove deforestation had large effects on the estuary with regard to both the physical and chemical environment with implications for the biological functioning.
机译：分析了越南中南部热带河口Nha-Phu / Binh Cang头和嘴附近带日期的沉积物核心的随时间变化的物理，化学和生物代理的变化，这些变化可能受到河口内红树林的去除的影响。获得了按时间序列排列的卫星图像，这表明河口顶部的红树林的枯竭是相对较新的。主要在1990年代后期，该地区的大部分地区被改建成了水产养殖池塘。沉积物记录显示，在红树林砍伐时，河口顶部的沉积速率明显增加，并且河口核心处的硅藻组合发生了变化，表明整个河口的水柱浊度增加了。红树林砍伐的时间。细粒沉积物的比例和δ〜（13）C信号均随着距河口顶部距离的增加而增加，而碳含量降低。整个河口的氮含量和δ〜（15）N信号基本保持恒定。细粒物料和化学代用品的比例随时间从嘴开始在岩心中或多或少稳定，而它们从河口顶部随时间随岩心同步变化。沉积物代理的结合表明，红树林的砍伐对河口的物理和化学环境都有很大影响，对生物学功能产生影响。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2014年第1期|32-40|共9页
  • 作者

    Marianne Ellegaard; Ngoc Tuong Giang Nguyen; Thorbjorn Joest Andersen; Anders Michelsen; Ngoc Lam Nguyen; Nhu Hai Doan; Erik Kristensen; Kaarina Weckstroem; Tong Phuoc Hoang Son; Lars Chresten Lund-Hansen;

  • 作者单位

    Department of Plant and Environmental Sciences (PLEN), University of Copenhagen, Thorvaldsensvej 40, 1st Floor, DK-1871 Frederiksberg C, Denmark,Department of Biology, University of Copenhagen, Denmark;

    Institute of Oceanography, Vietnam Academy of Science and Technology, Nha Trang, Viet Nam,Department of Biology, University of Copenhagen, Denmark;

    Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark;

    Department of Biology, University of Copenhagen, Denmark;

    Institute of Oceanography, Vietnam Academy of Science and Technology, Nha Trang, Viet Nam;

    Institute of Oceanography, Vietnam Academy of Science and Technology, Nha Trang, Viet Nam;

    Department of Biology, University of Southern Denmark, Denmark;

    Department of Marine Geology and Glaciology, Geological Survey of Denmark and Greenland, Denmark;

    Institute of Oceanography, Vietnam Academy of Science and Technology, Nha Trang, Viet Nam;

    Aquatic Biology, Department of Bioscience, Aarhus University, Denmark;

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  • 正文语种 eng
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  • 关键词

    diatoms; paleoecology; stable isotopes; grain size; sedimentation; Viet Nam;

    机译：硅藻古生态学稳定同位素晶粒大小;沉降;越南;

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