Estimation of soil weathering stage and acid neutralizing capacity in a toposequence Luvisol–Cambisol on loess under deciduous forest in Belgium
Estimation of soil weathering stage and acid neutralizing capacity in a toposequence Luvisol–Cambisol on loess under deciduous forest in Belgium
复制标题
比利时落叶林黄土上 Luvisol-Cambisol 拓扑序列土壤风化阶段和酸中和能力的估算
DOI：
10.1046/j.1365-2389.2000.00285.x
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发表时间：
2000
影响因子：
4.2
通讯作者：
Bruno Delvaux
中科院分区：
文献类型：
--
作者：
V. Brahy;J. Deckers;Bruno Delvaux
从黄土中提取的土壤在欧洲分布广泛，非常适合林业。然而，它们被怀疑是糟糕的酸缓冲。我们在比利时粉土带黄土上的地形序列中估算了林下酸性土壤的风化阶段和酸中和能力。土壤的形态和理化性质因其地形位置的不同而有明显差异。Dystric风化土发育在干燥谷底的堆积沉积物中，而Dystric Luvisol则形成在斜坡上的一种再生物质中。与路维索尔相比，冻土的酸性更强，碱的饱和度更低。它们严重缺乏粘土，含有较少的耐风化矿物。易风化矿物主要集中在两种土壤的粘粒中。因此，大小为<； 2 μm的粘土矿物是这些土壤中质子的主要汇。用一个简化的公式来估计酸中和能力，该公式考虑了碱的总储量、硅酸盐中的铝和铁的总量。我们的估计证实，这些酸性黄绵土确实是很差的酸性缓冲剂。它们表明，粘粒枯竭的Dystric风化土对潜在的酸化很敏感，无论是自然的还是人为的。
Soils derived from loess are extensive in Europe and are well suited for forestry. They are suspected to be poor acid buffers, however. We have estimated the weathering stage and acid neutralizing capacity of acid soils under forest in a toposequence on loess in the Belgian silt belt. The soils vary distinctly in morphology and physico‐chemical properties according to their topographic position. Dystric Cambisols have developed in colluvial deposits in the dry valley floors, whereas Dystric Luvisols have formed on the slopes in a rejuvenated material. The Cambisols are more acid and less saturated in bases than are Luvisols. They are strongly depleted of clay and contain less weatherable minerals. Easily weatherable minerals are concentrated mainly in the clay fraction of both soil types. Clay minerals of size < 2 μm therefore act as major sinks for protons in these soils. A simplified expression taking into account the total reserve in bases, total aluminium and iron occluded in silicates is used to estimate acid neutralizing capacity. Our estimates confirm that these acid loessic soils are indeed poor acid buffers. They show that the Dystric Cambisols depleted of clay are sensitive to potential acidification, whether natural or man‐made.