Biogeochemical cycles of soil phosphorus in southern Alpine spodosols
Biogeochemical cycles of soil phosphorus in southern Alpine spodosols
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DOI：
10.1016/s0016-7061(99)00026-9
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发表时间：
1999-09-01
期刊：
影响因子：
6.1
通讯作者：
Elsenbeer, H
中科院分区：
文献类型：
--
作者：
Beck, MA;Elsenbeer, H
我们将 Hedley 分馏应用于来自南阿尔卑斯山的三个 Spodosol，以描述土壤磷的生物或有机结合形式（碳酸氢盐 Po 和 NaOH Po）和地球化学或无机结合形式（树脂 Pi、碳酸氢盐 Pi、NaOH Pi、HCl Pi 和残留 P）的深度分布。这些 Spodosols 在游离铝的结晶度、无定形化合物的存在以及它们各自随深度的分布方面存在很大差异。只有在一种情况下，土壤磷的生物和地球化学形态的深度函数清楚地反映了无定形化合物的深度趋势。在两种情况下，要么没有趋势，要么没有明显的趋势，这表明存在土壤化学以外的控制。土壤磷的有机结合形式分别占表土和底土中总磷的 65% 和 40%，并且在所有三种土壤中，重碳磷在 30 厘米左右的深度最多达到土壤有效磷总量的 80%。我们无法证实以前关于灰土中生物和地球化学循环分层的说法，并且我们警告不要无根据地依赖土壤分类学，而不是相关的土壤化学数据，作为土壤发生背景下土壤磷循环解释的框架。 (C) 1999 Elsevier Science B.V. 保留所有权利。
We applied the Hedley fractionation to three Spodosols from the southern Alps to describe the distribution with depth of biological, or organically-bound forms (bicarb Po and NaOH Po) and of geochemical, or inorganically-bound forms (resin Pi, bicarb Pi, NaOH Pi, HCl Pi, and residual P) of soil phosphorus. These Spodosols differed considerably in regard to the crystallinity of free aluminium, the presence of amorphous compounds, and their respective distributions with depth. In only one case did the depth function of biological and geochemical forms of soil phosphorus clearly reflect the depth trend in amorphous compounds. In two cases, either no trend or no clear trend was obvious which suggests the presence of controls other than soil chemistry. Organically-bound forms of soil phosphorus are as high as 65% and 40% of total P in the topsoil and subsoil, respectively, and in all three soils, bicarb Po reaches a maximum of 80% of total available soil phosphorus at a depth of about 30 cm. We could not confirm previous claims of a stratification of biological and geochemical cycles in Spodosols, and we caution against an unwarranted reliance on soil taxonomy, instead of relevant soil chemical data, as a framework for the interpretation of soil phosphorus cycles in a pedogenetic context. (C) 1999 Elsevier Science B.V. All rights reserved.