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Remobilization of trace elements by forest fire in Patagonia, Chile

机译：智利巴塔哥尼亚的森林大火使微量元素迁移

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摘要

Temporal changes in the amounts of trace elements (As, Co, Cu, Mn, Ni, Pb, and Zn) and their correlations with temporal changes in charcoal abundance in age-dated sediments collected from Lake Thompson in Patagonia, Chile, attest to the substantial pyrogenic remobilization of contaminants that occurred in Patagonia during the mid-1900s. This remobilization was concurrent with the extensive slash and burn period in the region during that period. The changes in concentrations of Co, Cu, and Ni in relation to charcoal abundance in the lacustrine sediments over time were small compared to those of As, Mn, Pb, and Zn. However, the relatively low enrichment factors of all those trace elements, normalized to Fe, indicate that they were predominantly derived from local, natural sources impacted by fires rather than industrial sources. The primarily local source of Pb in the sediments was corroborated by the temporal consistency of its isotopic ratios (Pb-206/Pb-207:Pb-208/Pb-206), which were similar to previously reported values for natural lead in Central and Southern Chile. However, the pyrogenic remobilization of both natural and industrial trace elements by forest fires in Chile and elsewhere is expected to rise as a consequence of climate change, which is projected to increase both the frequency and intensity of forest fires on a global scale.
机译：从智利巴塔哥尼亚汤普森湖收集的陈年沉积物中痕量元素（As，Co，Cu，Mn，Ni，Pb和Zn）含量的时间变化及其与木炭丰度的时间变化相关，证明了1900年代中期在巴塔哥尼亚发生的污染物的大量热解运动。在该期间，该复员活动与该地区广泛的刀耕火种时期同时进行。与As，Mn，Pb和Zn的变化相比，湖沉积物中Co，Cu和Ni的浓度随木炭丰度的变化较小。但是，所有这些微量元素的富集因数相对较低（已标准化为Fe），表明它们主要来自受火灾影响的本地自然资源，而不是工业资源。沉积物中铅的主要本地来源是同位素比值（Pb-206 / Pb-207：Pb-208 / Pb-206）的时间一致性所证实的，这与先前报道的中部和北部天然铅的值相似智利南部。但是，由于气候变化，预计智利和其他地方的森林大火对自然和工业微量元素的热解活动会增加，预计这将在全球范围内增加森林大火的发生频率和强度。

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  • 来源
    《Regional Environmental Change》 |2016年第4期|1089-1096|共8页
  • 作者

    Odigie Kingsley O.; Khanis Ethel; Hibdon Sharon A.; Jana Patricia; Araneda Alberto; Urrutia Roberto; Flegal A. Russell;

  • 作者单位

    Univ Calif Santa Cruz, WIGS Lab, Environm Toxicol, 1156 High St, Santa Cruz, CA 95064 USA;

    Univ Calif Santa Cruz, WIGS Lab, Environm Toxicol, 1156 High St, Santa Cruz, CA 95064 USA;

    Univ Calif Santa Cruz, WIGS Lab, Environm Toxicol, 1156 High St, Santa Cruz, CA 95064 USA;

    Univ Concepcion, Environm Sci Ctr EULA Chile, Aquat Syst Res Unit, Grp Paleolimnol Studies GEP, Concepcion, Chile;

    Univ Concepcion, Environm Sci Ctr EULA Chile, Aquat Syst Res Unit, Grp Paleolimnol Studies GEP, Concepcion, Chile;

    Univ Concepcion, Environm Sci Ctr EULA Chile, Aquat Syst Res Unit, Grp Paleolimnol Studies GEP, Concepcion, Chile;

    Univ Calif Santa Cruz, WIGS Lab, Environm Toxicol, 1156 High St, Santa Cruz, CA 95064 USA|Univ Concepcion, Environm Sci Ctr EULA Chile, Aquat Syst Res Unit, Grp Paleolimnol Studies GEP, Concepcion, Chile;

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  • 正文语种 eng
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  • 关键词

    Pyrogenic remobilization; Trace elements; Lead isotopic composition; Wildfire;

    机译：热解动员微量元素铅同位素组成野火;

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