globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-016-0266-9
Scopus记录号: 2-s2.0-84992365679
论文题名:
Mineralogy and biogeochemistry of potassium in the Skogaby experimental forest, southwest Sweden: pools, fluxes and K/Rb ratios in soil and biomass
作者: Simonsson M.; Court M.; Bergholm J.; Lemarchand D.; Hillier S.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 131, 期:2018-01-02
起始页码: 77
结束页码: 102
语种: 英语
英文关键词: Clay minerals ; Feldspar ; Forest ecosystem ; K/Rb ratio ; Mica ; Potassium cycle
Scopus关键词: biogeochemistry ; clay mineral ; coniferous forest ; feldspar ; flux measurement ; forest ecosystem ; forest floor ; fractionation ; glacial deposit ; mica ; mineralogy ; parent material ; potassium ; rubidium ; Sweden ; Picea abies
英文摘要: Clay minerals and K feldspars were evaluated as sources of K in a Norway spruce stand (Picea abies (L.) Karst.) from the Skogaby experimental forest in southwest Sweden. The soil, developed in a Quaternary glacial till, has only 3–5% clay, and more than 95% of its K resides in feldspars. Ratios of K/Rb were assessed in interlayers of 2:1 clay minerals (extracted with hot (100 °C) 2 M HCl), biomass and the forest floor. These compartments had similarly low K/Rb ratios, whereas K feldspars were significantly poorer in Rb. A fractionation model indicated preferential retention of Rb in the biomass and forest floor, due to stronger adsorption of Rb than K in the humus, as well as preferential uptake of K from the exchange complex in the mineral soil. Preferential uptake of K may result from weaker adsorption of K by the cation exchanger, or preference for dissolved K over Rb by the roots. A quantitative mineralogical analysis revealed that loss from micas may account for half of the Holocene loss of K from the soil, which was approximately 22 Mg ha−1. Exceptionally low K/Rb ratios in HCl extracts of the upper 60 cm of the profile indicated extensive loss of K from mica in the parent material and re-fixation of K and Rb at lower ratios. The results indicate that fixation in and release from clay minerals may be prominent in the cycling of K, even in a soil that is poor in clay minerals. © 2016, The Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83328
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Department of Soil and Environment, Swedish University of Agricultural Sciences (SLU), P.O. Box 7014, Uppsala, Sweden; INRA, Centre de Nancy, Biogéochimie des Écosystèmes Forestiers, Route d’Amance, Champenoux, France; Kantarellvägen 6, Uppsala, Sweden; Department of Ecology, Swedish University of Agricultural Sciences (SLU), P.O. Box 7044, Uppsala, Sweden; Laboratoire d’Hydrologie et de Géochimie de Strasbourg, EOST, Université de Strasbourg and CNRS, 1 rue Blessig, Strasbourg Cedex, France; The James Hutton Institute, Craigiebuckler, Aberdeen, United Kingdom

Recommended Citation:
Simonsson M.,Court M.,Bergholm J.,et al. Mineralogy and biogeochemistry of potassium in the Skogaby experimental forest, southwest Sweden: pools, fluxes and K/Rb ratios in soil and biomass[J]. Biogeochemistry,2016-01-01,131(2018-01-02)
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