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首页> 外文期刊>Journal of soil & sediments >The influence of particle size and mineralogy on both phosphorus retention and release by streambed sediments
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The influence of particle size and mineralogy on both phosphorus retention and release by streambed sediments

机译：颗粒大小和矿物学对流沉积物磷保持和释放的影响

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摘要

Purpose In many streams worldwide including those on the south coast of Western Australia (WA), sediments of the 2-mm fraction often contribute up to 50% of the streambed. However, most analysis and interpretation of sediment chemistry, including phosphorus (P), is conducted on the 2-mm fraction as this fraction is considered the most chemically reactive. This paper aims to identify the contribution of the 2-mm fraction to P retention and release in sandy-gravely streams.Material and methods Sediment samples were collected from streams in agricultural catchments, and P retention and release by the 2-mm and 2-mm (typically lateritic; iron rich) sediment fractions were examined using fluvarium and batch experiments. Phosphorus sorbed by sediment was estimated on a mass (mg P kg(-1)) and area basis (mg P m(-2)).Results and discussion Phosphorus sorption measurements suggested that mineralogy as well as particle size were important factors influencing P retention by stream sediments. Stream sediments retained approximately 30% of added P. In a desorption phase, approximately 8% of the retained P was released into stream water.Conclusions Stream sediments in south western WA appear to be net immobilisers of P, retaining more P than they release, dependent on the stream P concentration. Exclusion of the 2-mm fraction when determining stream sediment P dynamics may therefore underestimate whole stream sediment P retention and release.
机译：目的在世界范围内的许多溪流中，包括西澳大利亚州（WA）南海岸的溪流中，大于2毫米的沉积物通常占溪流的50％。但是，大多数沉积物化学成分（包括磷（P））的分析和解释都是在<2-mm的馏分上进行的，因为该馏分被认为具有最高的化学活性。本文旨在鉴定> 2 mm的组分对砂质重力流中P保留和释放的贡献。材料和方法从农业流域的河流中收集沉积物样品，并通过<2-mm和使用氟和分批实验检查了大于2毫米（通常为红土；富含铁）的沉积物部分。沉积物吸附的磷以质量（mg P kg（-1）和面积（mg P m（-2））为基础进行估算。结果与讨论磷的吸附测量表明，矿物学和粒径是影响磷含量的重要因素。被河流沉积物截留。河流沉积物保留了大约30％的添加的P。在解吸阶段，大约8％的保留P被释放到河流水中。结论西南部的河流沉积物似乎是P的净固定剂，保留的P比释放的P多，取决于流P的浓度。因此，在确定河流沉积物P动态时，排除> 2 mm的分数可能会低估整个河流沉积物P的保留和释放。

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  • 来源
    《Journal of soil & sediments》 |2019年第5期|2624-2633|共10页
  • 作者

    Clarendon Simon D. V; Weaver David M.; Davies Peter M.; Coles Neil A.;

  • 作者单位

    Univ Western Australia, Ctr Excellence Nat Resource Management, Albany, WA 6330, Australia|Dept Primary Ind New South Wales, 4 Marsden Pk Rd, Calala, NSW 2340, Australia;

    Dept Primary Ind & Reg Dev, 444 Albany Hwy, Albany, WA 6330, Australia;

    Univ Western Australia, Sch Biol Sci, M460,35 Stirling Highway, Crawley, WA 6009, Australia|Murdoch Univ, 90 South St, Murdoch, WA 6150, Australia;

    Univ Leeds, Fac Earth & Environm, Sch Geog, Leeds LS2 9JT, W Yorkshire, England|Univ Western Australia, Inst Agr, M460,35 Stirling Highway, Crawley, WA 6009, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lateritic; Particle size; Phosphorus; Sediment; Surface area;

    机译：红土;颗粒大小;磷;沉积物;表面面积;

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