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首页> 外文期刊>Ocean & coastal management >Increased sediment loads over coral reefs in Saint Lucia in relation to land use change in contributing watersheds
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Increased sediment loads over coral reefs in Saint Lucia in relation to land use change in contributing watersheds

机译：与主要流域的土地利用变化相关的圣卢西亚珊瑚礁上的沉积物负荷增加

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Increased sedimentation is widely acknowledged to be an important stressor for Caribbean coral reefs. However, for most locations we currently lack both accurate records of changes in sediment accumulation rates over reefs as well as a quantitative link between land-based sources of sediment and sediment delivery to coastal waters. This paper aims to address this gap in our quantitative understanding of these processes for two watersheds in the island of Saint Lucia in the West Indies. We used sediment cores collected near downstream coral reefs to examine changes in sediment composition and accumulation rate over the past several decades and relied upon a GIS-based sediment budget model to estimate recent sediment yields in the two focal watersheds. Analysis of sediment cores indicated that accumulation rates of terrigenous sediment, originating from the upstream watersheds, and calcareous sediment, likely arising from dead corals, have increased 2-3 fold over the last 3-4 decades. Model-estimated changes in sediment yields between 1995 and 2010 were associated with the expansion of the unpaved road network and were congruent with measured changes in terrigenous sediment accumulation rates near the reefs over the same period. The majority (83-95%) of sediment yield in the two watersheds was attributable to unpaved and degraded roads; in fact, just four or five road segments, representing ＜20% of the road network in each watershed, accounted for nearly half of the estimated sediment yield in 2010. Our results suggest that unpaved roads are major sediment sources in the two study watersheds and therefore merit closer attention when implementing erosion control measures intended to reduce sediment loading into reef-bearing coastal waters.
机译：人们普遍认为，增加的沉积物是加勒比珊瑚礁的重要压力源。然而，对于大多数地区，我们目前既缺乏关于礁石上沉积物沉积速率变化的准确记录，也缺乏基于陆地的沉积物来源与沉积物向沿海水域输送之间的定量联系。本文旨在解决我们在对西印度群岛圣卢西亚岛的两个流域的这些过程的定量理解上的差距。我们使用了在下游珊瑚礁附近收集的沉积物核芯来检查过去几十年来沉积物成分和积累速率的变化，并基于基于GIS的沉积物预算模型来估算两个重点流域的近期沉积物产量。对沉积物核心的分析表明，来自上游流域的陆源沉积物和钙质沉积物（可能来自死珊瑚）的积累速率在过去3-4年中增加了2-3倍。在1995年至2010年间，模型估算的沉积物产量变化与未铺砌的路网的扩张有关，并且与同期珊瑚礁附近陆源性沉积物积累速率的变化变化一致。两个流域的大部分泥沙产量（83-95％）归因于未铺砌和退化的道路。实际上，在2010年，每个分水岭的路网中，只有四个或五个路段占道路网的＜20％，占估计泥沙产量的近一半。我们的结果表明，未铺砌的道路是两个研究流域的主要泥沙源因此，在实施旨在减少沉积物进入含礁沿海水域的侵蚀控制措施时，应格外注意。

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  • 来源
    《Ocean & coastal management》 |2014年第7期|35-45|共11页
  • 作者

    Chantale Begin; Gregg Brooks; Rebekka A. Larson; Suzana Dragicevic; Carlos E. Ramos Scharron; Isabelle M. Cote;

  • 作者单位

    Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada,Department of Integrative Biology,University of South Florida, 4202 E. Fowler Ave, Tampa, FL 33620, USA;

    Department of Marine Science, Eckerd College, 4200 54th Avenue S., St. Petersburg, FL 33711, USA;

    Department of Marine Science, Eckerd College, 4200 54th Avenue S., St. Petersburg, FL 33711, USA;

    Department of Geography, Simon Fraser University, Burnaby, BC V5A 1S6, Canada;

    Department of Geography and the Environment & Lozano Long Institute of Latin American Studies, The University of Texas at Austin, 305 E. 23rd Street,CLA 3.306, Austin, TX 78712, USA;

    Department of Biological Sciences, Simon Fraser University, Burnaby, BC V5A 1S6, Canada;

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