Organo-metallic complexes in an Andosol: a comparative study with a Cambisol and Podzol
Organo-metallic complexes in an Andosol: a comparative study with a Cambisol and Podzol
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DOI：
10.1016/s0016-7061(00)00064-1
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发表时间：
2001-01-01
期刊：
影响因子：
6.1
通讯作者：
Jeanroy, E
中科院分区：
文献类型：
--
作者：
Aran, D;Gury, M;Jeanroy, E
目前的土壤形成过程是在孚日山脉（法国东部诺亚）的非水铝质安多索土壤中进行的研究。为此，我们对 Andosol 和该地区其他典型土壤（Cambisol 和 Podzol）的选定剖面的有机金属分数动态进行了比较研究。这些土壤源自中等土壤温度和乌迪克土壤湿度条件下的古老火山岩。 Andosol剖面显示出非水铝酸Andosol的特征：腐殖质大量积累，活性铝主要与腐殖质络合，pH值低。我们分别通过分解测试和孵育实验特别关注这些有机金属缔合体的物理和微生物稳定性。结果表明，这些缔合体对水分解和生物降解表现出很强的抵抗力。此外，零张力蒸渗仪收集的土壤溶液中 DOC、Al 和 Fe 的浓度非常低，加上分散测试后获得的水分散粘土含量非常低，表明在该 Andosol 剖面中这些成分没有发生明显的易位。低流动性和对矿化的强大抵抗力可能是安多土壤中碳大量积累的原因。 (C) 2001 Elsevier Science B.V. 保留所有权利。
Current soil-forming processes were studied in a nonallophanic Andosol from the Vosges mountains (noah-eastern France). For this purpose, we conducted comparative studies on the organo-metallic fraction dynamics of selected profiles of an Andosol and other typical soils from this region, Cambisol and Podzol. These soils are derived from old volcanic rocks under mesic soil temperature and udic soil moisture regimes. The Andosol profile displayed the characteristics of nonallophanic Andosols: large accumulation of humus, active Al mostly complexed with humus, and low pH. Special attention was given to physical and microbial stability of these organo-metallic associations, respectively by disaggregation tests and incubation experiments. The results indicated that these associations showed a strong resistance against disaggregation by water and against biodegradation. Moreover, the very low concentration of DOC, Al and Fe in soil solutions collected by zero-tension lysimeters, coupled with very low amounts of water-dispersed clays obtained after dispersion tests, suggested that no significant translocations of these components occurred in this Andosol profile. Low mobility together with a strong resistance against mineralization may account for the large accumulation of carbon in this Andosol. (C) 2001 Elsevier Science B.V. All rights reserved.