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首页> 外文期刊>Journal of soil & sediments >Comparison of sampling designs for sediment source fingerprinting in an agricultural watershed in Atlantic Canada
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Comparison of sampling designs for sediment source fingerprinting in an agricultural watershed in Atlantic Canada

机译：加拿大大西洋一个农业流域泥沙源指纹图谱采样设计的比较

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摘要

Purpose Sediment fingerprinting is increasingly being used to improve the understanding of sediment dynamics within the critical zone and provide information that can help guide management decisions at the watershed scale. The objectives of this study were to investigate both the implications of different sediment fingerprinting sampling designs and spatial scales on the characterization of sediment dynamics in a predominantly agricultural watershed in northwestern New Brunswick, Canada. Materials and methods Color and radionuclide fingerprints were used to discriminate between three potential sediment sources: agricultural topsoil, agricultural streambanks, and forested areas (topsoil and streambanks). Suspended sediment was collected seasonally, between 2008 and 2014, at five sites with drainage areas ranging from 3.0 to 13.4 km(2). Using the same source and sediment data set, multiple-, nested-, and local-location fingerprinting sampling designs were employed to investigate the influence of scale of observation, geomorphic connectivity, land use, and the heterogeneity of source fingerprints on apportionment results. Results and discussion Sediment collected in the headwaters was primarily derived from forested areas while the sediment collected at the outlet of the watershed was primarily from agricultural topsoil. When comparing the multiple- and nested-location designs, it was found that accounting for the spatial variability in the fingerprint properties of each source had a small difference in the sediment apportionment results. Furthermore, the local-location design demonstrated that the sediment collected at each location was composed of predominately local sources as opposed to upstream sediment entering the local catchment. Conclusions Assessment of the sources of sediment at a range of spatial scales better accounts for both geomorphic connectivity and differences in land use throughout the watershed. Overall, each of the three fingerprinting sampling designs provided different information that can be used to guide soil and water conservation management.
机译：目的越来越多地使用沉积物指纹识别来提高对关键区域内沉积物动力学的理解，并提供有助于指导分水岭规模管理决策的信息。这项研究的目的是调查在加拿大新不伦瑞克省西北部一个主要农业流域中不同沉积物指纹采样设计和空间尺度对沉积物动力学特征的影响。材料和方法使用颜色和放射性核素指纹来区分三种潜在的沉积物来源：农业表土，农业河床和林区（表土和河床）。在2008年至2014年之间，季节性收集了五个地点的悬浮沉积物，排水面积在3.0至13.4 km（2）之间。使用相同的源和沉积物数据集，采用多重，嵌套和本地定位指纹采样设计来研究观测规模，地貌连通性，土地利用以及源指纹的异质性对分配结果的影响。结果与讨论源头收集的沉积物主要来自森林地区，而集水区出口处收集的沉积物主要来自农业表土。当比较多位置设计和嵌套位置设计时，发现考虑到每种来源的指纹特性的空间变异性对沉积物分配结果的影响很小。此外，本地设计表明，每个位置收集的沉积物主要由本地来源组成，而不是上游沉积物进入本地集水区。结论在一系列空间尺度上评估沉积物来源可以更好地说明地貌连通性和整个流域土地利用的差异。总体而言，三种指纹采样设计均提供了不同的信息，可用于指导水土保持管理。

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  • 来源
    《Journal of soil & sediments》 |2019年第9期|3302-3318|共17页
  • 作者

    Boudreault Monica; Koiter Alexander J.; Lobb David A.; Liu Kui; Benoy Glenn; Owens Philip N.; Li Sheng;

  • 作者单位

    Agr & Agri Food Canada Fredericton Res & Dev Ctr 850 Lincoln Rd Fredericton NB E3B 4Z7 Canada|Univ Manitoba Dept Soil Sci 13 Freedman Crescent Winnipeg MB R3T 2N2 Canada;

    Agr & Agri Food Canada Fredericton Res & Dev Ctr 850 Lincoln Rd Fredericton NB E3B 4Z7 Canada|Brandon Univ Dept Geog 270 18th St Brandon MB R7A 6A9 Canada;

    Univ Manitoba Dept Soil Sci 13 Freedman Crescent Winnipeg MB R3T 2N2 Canada;

    Agr & Agri Food Canada Swift Current Res & Dev Ctr 1 Airport Rd Swift Current SK S9H 3X2 Canada;

    Univ New Brunswick Fac Forestry & Environm Management 3 Bailey Dr Fredericton NB E3B 5A3 Canada|Univ New Brunswick Canadian Rivers Inst 3 Bailey Dr Fredericton NB E3B 5A3 Canada;

    Univ Northern British Columbia Environm Sci Program 3333 Univ Way Prince George BC V2N 4Z9 Canada|Univ Northern British Columbia Quesnel River Res Ctr 3333 Univ Way Prince George BC V2N 4Z9 Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Agriculture; Sampling design; Sediment fingerprinting; Water quality;

    机译：农业;抽样设计;沉积物指纹图谱;水质;

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