Nitric-acid soluble fractions of 21 elements in Norwegian podzols: Factors affecting regional differences in vertical distribution
Nitric-acid soluble fractions of 21 elements in Norwegian podzols: Factors affecting regional differences in vertical distribution
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DOI：
10.1016/j.apgeochem.2005.03.006
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发表时间：
2005-07-01
影响因子：
3.4
通讯作者：
Sjobakk, TE
中科院分区：
文献类型：
--
作者：
Donisa, C;Steinnes, E;Sjobakk, TE
采用电感耦合等离子体质谱技术，研究了挪威不同地区北方森林13个灰土剖面中不同层位硝酸提取物中21种常量元素和微量元素的分布。根据不同层位HNO3可提取组分之间的比值，阐明了一些总体趋势。在腐殖质层和矿物层中发现了两组不同的元素，一组主要与大气污染有关(As、Cd、Sb、Pb)，另一组主要与植物养分循环有关(K、Ca、Mn，其次是Mg、Co、Ni、Rb)，还有一些元素同时与大气污染有关(Cu、Zn、Tl)。B层中与Fe一起富集最明显的元素依次为V、Pb、Al和Cr，部分原因是受污染的有机表层土壤淋溶。最南端的四种土壤表现出与其他土壤截然不同的行为，并被作为一个单独的组对待。相对于更偏北的地点，这些土壤的表层强烈亏损致岩元素(Mg、Al、K、Ca、Sc、V、Cr、Mn、Fe、Co、La)，而富含具有污染物远距离迁移特征的元素(As、Cd、Sb、Tl、Pb)。南部土壤中的B层强烈亏损致岩群元素，包括Fe和伴生金属。造成这种差异的主要原因被认为是越境空气污染和相关金属的影响更大，以及该国最南端的土壤酸化更严重。(C)2005爱思唯尔有限公司。保留所有权利。
Distributions of 21 major and trace elements in HNO3 extracts of different horizons were studied in 13 podzol profiles from the boreal forest in different parts of Norway using ICP-MS. On the basis of ratios between the HNO3-extractable fractions in the various horizons some general trends were elucidated. Two different groups of elements concentrated in the humus layer relative to the mineral horizons were identified, one mainly associated with contributions from air pollution (As, Cd, Sb, Pb), another one with plant nutrient circulation (K, Ca, Mn and to a lesser extent Mg, Co, Ni, Rb) and some with both mechanisms (Cu, Zn, Tl). The elements most clearly enriched along with Fe in the B horizon were V, Pb, Al, and Cr in that order, Pb partly because of leaching from the polluted organic surface soil. Four soils in the far south showed a behaviour distinctly different from the rest and were treated as a separate group. Relative to the more northerly sites the surface horizons of these soils were strongly depleted in lithogenic elements (Mg, Al, K, Ca, Sc, V, Cr, Mn, Fe, Co, La) and enriched in elements typical of long-range transport of pollutants (As, Cd, Sb, Tl, Pb). Also the B horizon in the southern soils was strongly depleted in the lithogenic group elements, including Fe and the associated metals. The main reason for this difference is assumed to be the greater influence of transboundary air pollution and associated metals and stronger soil acidification in the far south of the country. (c) 2005 Elsevier Ltd. All rights reserved.