Contaminated sediment dynamics in peatland headwater catchments
Contaminated sediment dynamics in peatland headwater catchments
复制标题
泥炭地源头流域污染沉积物动态
DOI：
10.1007/s11368-017-1674-8
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发表时间：
2017
影响因子：
3.6
通讯作者：
J. Rothwell
中科院分区：
文献类型：
--
作者：
E. Shuttleworth;G. Clay;M. Evans;S. Hutchinson;J. Rothwell
目的尽管对泥炭地铅储存进行了大量研究，但对受污染沉积物动员机制的正式描述仍然有限。本研究探讨了英国峰区国家公园侵蚀泥炭地受污染沉积物动态的控制因素。材料和方法本研究使用存储在泥炭表面附近的铅污染作为指纹，追踪三个严重退化的水源集水区的受污染沉积物动态。在一系列流域表面使用现场便携式 XRF 分析仪来检查污染物储存和释放的模式。结果和讨论铅浓度在小空间范围内变化很大。侵蚀使河间表面暴露出高浓度的铅（高达 1660 µg g−1），并且大量返工污染材料（高达 1010 µg g−1）储存在其他集水表面（沟渠壁和地面）上。多种因素已被证明可以显着控制该环境中的铅释放和储存，包括风作用、坡向和沟壑深度。植被在保留受污染泥炭流域内与沉积物结合的重金属方面也发挥着重要作用。结论本研究首次全面概述了控制退化泥炭地中铅释放和储存的机制。先前对铅通量的评估可能低估了严重退化系统的污染物排放量。风也被认为是泥炭地环境中重金属运输的一种尚未确定的载体。
PurposeDespite substantial research into Pb storage in peatlands, formal description of the mechanisms of contaminated sediment mobilisation is limited. This study explores the controlling factors of contaminated sediment dynamics in an eroding peatland in the Peak District National Park, UK.Materials and methodsThis study uses the Pb contamination stored near the peat’s surface as a fingerprint to trace contaminated sediment dynamics in three severely degraded headwater catchments. A field portable XRF analyser was used across a range of catchment surfaces to examine patterns of contaminant storage and release.Results and discussionLead concentrations varied greatly over a small spatial scale. Erosion is exposing high concentrations of Pb on interfluve surfaces (up to 1660 μg g−1), and substantial amounts of reworked contaminated material (up to 1010 μg g−1) are stored on other catchment surfaces (gully walls and floors). A variety of factors have been shown to significantly control Pb release and storage in this environment, including wind action, aspect, and gully depth. Vegetation also plays an important role in retaining sediment-bound heavy metals within contaminated peat catchments.ConclusionsThis study provides the first comprehensive overview of the mechanisms controlling Pb release and storage in degraded peatlands. Previous assessments of Pb fluxes may have underestimated contaminant export from severely degraded systems. Wind has also been identified as an as yet unaccounted for vector for heavy metal transport in peatland environments.
影响因子：
5
作者：
Cole, Beth;McMorrow, Julia;Evans, Martin
通讯作者：
Evans, Martin
高地环境变化的驱动因素
DOI：
10.4324/9780203886724
发表时间：
2009
期刊：
--
影响因子：
--
作者：
Bonn A
通讯作者：
Bonn A