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首页> 外文期刊>土壤圈（英文版） >Spatial and Seasonal Variations of Heavy Metals in Wetland Soils of the Tidal Flats in the Yangtze Estuary, China:Environmental Implications
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Spatial and Seasonal Variations of Heavy Metals in Wetland Soils of the Tidal Flats in the Yangtze Estuary, China:Environmental Implications

机译：长江口滩涂湿地土壤重金属的时空变化：对环境的影响

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摘要

The environment of estuarine wetlands has been attracting worldwide attention.To study the spatial distribution of pollutants in the tidal flats of the Yangtze Estuary,Southeast China,the Eastern Tidal Flat of Chongming Island (EC) and the Jiuduansha Shoal (JS) of the estuary were selected as the study sites.At each of the two sites,a cross-transect from land to sea was established and topsoil and soil core samples in the cross-transect were collected spatially and seasonally to determine their contents of heavy metals (Cu,Zn,Pb,Cd,Cr,Ni,Mn,and Fe) and grain-size characteristics.The results showed that the heavy metal loads were commonly higher in the soils of nearshore high tidal fiats and had a tendency of decreasing from land to sea at both of the study sites.The contents of heavy metals in the soils of the high and medial tidal fiats were mostly higher in April and November but lower in July.Corresponding spatial and seasonal variations in grain size of the intertidal soils were also observed at the two study sites.The soils in the nearshore high tidal fiats were finer and gradually got coarser seawards; they were relatively finer in April and November but coarser in July.Furthermore,the contents of heavy metals in the intertidal soils of both the sites EC and JS were significantly positively correlated with the clay (＜ 2 μm) and 2-20 μm fractions,but negatively with the sand (＞ 63 μm) and 20-63 μm fractions,which suggested that the heavy metals in the intertidal soils were primarily combined with the fine particulate fraction (＜ 20 μm),especially clay,and hence the spatial and seasonal variations in heavy metals were actually caused by the change of the grain-size characteristics of the intertidal soils due to the different sedimentary environments in the estuary.The results of this study may also contribute to a better understanding of the soil formation and classification in the tidal fiats of the Yangtze Estuary.
机译：河口湿地的环境一直吸引着全世界的目光。研究长江口，中国东南部，崇明岛东部的滩涂和九段沙滩的污染物的空间分布在这两个地点中的每个地点，建立了一个从陆地到海洋的横断面，并在空间和季节上收集了该横断面的表土和土壤核心样品，以确定它们的重金属含量（ Zn，Pb，Cd，Cr，Ni，Mn和Fe）和晶粒尺寸特征。结果表明，近岸高潮性平壤土壤中的重金属负载通常较高，并且有从陆到海减少的趋势在两个研究地点，潮汐和中间潮汐平原土壤中的重金属含量在4月和11月大多较高，但在7月较低。潮间带土壤粒度的相应空间和季节变化也较大在这两个研究地点都可以观察到。近岸高潮平原的土壤较细，向海逐渐变粗。它们在4月和11月相对较好，而在7月则较粗糙。此外，EC和JS站点潮间带土壤中重金属的含量与黏土（＜2μm）和2-20μm级分显着正相关，但与砂（> 63μm）和20-63μm的分数呈负相关，这表明潮间带土壤中的重金属主要与细颗粒物（<20μm）尤其是粘土结合，因此在空间和季节上由于河口沉积环境的不同，潮间带土壤粒度特征的变化实际上导致了重金属的变化。本研究的结果也可能有助于更好地了解河口土壤的形成和分类。长江口的潮汐。

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  • 来源
    《土壤圈（英文版）》 |2013年第4期|511-522|共12页
  • 作者

    HU Xue-Feng; DU Yan; FENG Jian-Wei; FANG Sheng-Qiong; GAO Xiao-Jiang; XU Shi-Yuan;

  • 作者单位

    Department of Environmental Science and Engineering, School of Environmental and Chemical Engineering, Shanghai University,Shanghai 200444 China;

    Department of Environmental Science and Engineering, School of Environmental and Chemical Engineering, Shanghai University,Shanghai 200444 China;

    Department of Environmental Science and Engineering, School of Environmental and Chemical Engineering, Shanghai University,Shanghai 200444 China;

    Department of Environmental Science and Engineering, Fuzhou University, Fuzhou 350002 China;

    Department of Environmental Science and Engineering, Fudan University, Shanghai 200433 China;

    Department of Geography, East China Normal University, Shanghai 200062 China;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 eng
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