Seasonal dynamics of Al- and Fe-bearing secondary minerals in an acid forest soil: influence of Norway spruce roots (Picea abies (L.) Karst.)
Seasonal dynamics of Al- and Fe-bearing secondary minerals in an acid forest soil: influence of Norway spruce roots (Picea abies (L.) Karst.)
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DOI：
10.1111/j.1365-2389.2012.01470.x
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发表时间：
2012-10-01
影响因子：
4.2
通讯作者：
Turpault, M. P.
中科院分区：
文献类型：
--
作者：
Collignon, C.;Ranger, J.;Turpault, M. P.
铝（Al）和铁（Fe）在成土过程中起着关键作用，然而，短期的变化，铝和铁的次生矿物很少记录。在这项研究中，铝和铁的动态在固相中已被评估在三个土壤室（散装，根际外，对应于从新鲜的根分离的土壤体积，根际内，对应于从干根分离的土壤体积），并在4个月（11月，2月，5月和8月）在酸性土壤与灰化土的功能在其表面。土壤样品采自挪威云杉（Picea abies（L.）喀斯特。）在三个深度（03、310和1023 cm）下进行，并在200 μ m下筛分。铝和铁的形式，用不同的溶液提取：氯化钾（AlKCl和FeKCl），草酸盐（Alo和FeO），三柠檬酸盐（Alc）和连二亚硫酸盐-柠檬酸盐-碳酸氢盐（美联储）。观察了云杉根系和季节对Al和Fe动态（沉淀和溶解反应）的影响。根际效应随取样日期的不同而不同。因此，仅根际内土壤中的Fed-Feo在冬季和春季之间减少（减少40%）。相比之下，Alc是更大的散装土壤比在两个根际土壤的所有季节。铝的变化最强的深度，特别是在散装和根际外土壤，其中Alc-Alo冬季和春季之间急剧下降（从50%到60%）。灰化过程的季节动态进行了讨论。这项研究表明，铝和铁的次生矿物可以快速反应的环境变化，这表明这些矿物可能是目前活跃的功能土壤的标志。
Aluminium (Al) and iron (Fe) play a key role in pedogenetic processes; however, short-term changes in Al- and Fe-bearing secondary minerals are little documented. In this study, Al and Fe dynamics in the solid phase have been evaluated in three soil compartments (bulk, rhizosphere outer, corresponding to soil volume detached from fresh roots, and rhizosphere inner, corresponding to soil volume detached from dried roots) and during 4 months (November, February, May and August) in an acid soil with podzolic features at its surface. Soil samples were collected from under Norway spruce (Picea abies (L.) Karst.) at three depths (03, 310 and 1023 cm) and were sieved at 200 mu m. The Al and Fe forms were extracted with different solutions: potassium chloride (AlKCl and FeKCl), oxalate (Alo and Feo), tri-citrate (Alc) and dithionite-citrate-bicarbonate (Fed). The influence of spruce roots and seasons on the dynamics of Al and Fe (precipitation and dissolution reactions) was observed. The rhizosphere effect on Fed varied with sampling dates. Thus, Fed-Feo decreased between winter and spring in the rhizosphere inner soil only (decrease of 40%). In contrast, Alc was greater in the bulk soil than in both rhizosphere soils for all seasons. The strongest variations in Al were observed at depth, especially in the bulk and the rhizosphere outer soil, where Alc-Alo decreased drastically between winter and spring (from 50 to 60%). The seasonal dynamics of the podzolization process are discussed. This study shows that Al- and Fe-bearing secondary minerals can quickly react to environmental changes, suggesting that these minerals could be markers of currently active functioning of soils.