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首页> 外文期刊>Acta Agriculturae Scandinavica. Section B, Soil and Plant Science >Phosphorus in Macropore Walls of a Danish Glossudalf
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Phosphorus in Macropore Walls of a Danish Glossudalf

机译：丹麦格洛达夫大孔壁中的磷

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摘要

The distribution of iron, aluminium and phosphorus fractions in a pseudogley soil (Fine-loamy, mixed, mesic Oxyaquic Glossudalf), including transects across albic macro-pores (tongues) in the glossic horizon have been investigated by use of selectiveextraction techniques. In the glossic horizon a distinct redox-front is observed between albic ped faces adjacent to the macropore lumen and brown ped interiors. Samples, each representing a thickness of 2-3 mm in transects orthogonal to the macropore and the redox-front, show up to five times more citrate-bicarbonate-dithionite extractable Fe and Al (Fe_d, Al_d) in brown ped interiors than in albic ped faces. Surprisingly, the content of total (P_(tot)) and inorganic phosphorus (P_i) have a nearly uniform distribution across the transects. In the albic ped faces the contents of citrate-bicarbonate-dithionite extractable (P_d) and oxalate extractable phosphorus (P_(ox)) are both low whereas the amounts of P_i or P extractable by 1 M HC1 (P_(HCl)) are remarkably high. Calculations demonstrate that the low content of P_d is not due to phosphate saturation. The large P_(HCl) -- P_d fraction in ped faces is attributed to occluded P, because the P_(HCl) -- P_d fraction is equivalent to the P_(HCl) -- P_(ox) fraction and oxalate is found able to dissolve apatite. The occluded P is not present within Al and Fe oxides, but probably contained in silicates. In the brown ped interiors most phosphate is bound to crystalline Al and Fe oxides.
机译：利用选择性提取技术研究了假pseudo质土壤（细质壤土，混合的，中性的Oxyaquic Glossudalf）中铁，铝和磷的分布，包括在光滑的地平线上横穿白色大孔（舌头）的样带。在光滑的视野中，在与大孔内腔相邻的白色ped面和棕色ped内部之间观察到明显的氧化还原前沿。样品在正交于大孔和氧化还原前沿的横断面上代表2-3 mm的厚度，其褐铁矿内部的柠檬酸盐-碳酸氢盐-连二亚硫酸盐可萃取的Fe和Al（Fe_d，Al_d）的含量是白铝矿中的五倍。 ped的脸。令人惊讶的是，总磷含量（P_（tot））和无机磷含量（P_i）在整个样条上几乎均匀分布。在白色的ped面孔中，柠檬酸盐-碳酸氢盐-连二亚硫酸盐可萃取物（P_d）和草酸盐可萃取磷（P_（ox））的含量都很低，而1 M HCl（P_（HCl））可萃取的P_i或P的含量却显着高。计算表明，P_d含量低不是由于磷酸盐饱和引起的。 ped面中较大的P_（HCl）-P_d分数归因于闭塞的P，因为P_（HCl）-P_d分数等于P_（HCl）-P_（ox）分数，并且发现草酸盐能够溶解磷灰石。吸留的P在Al和Fe氧化物中不存在，但可能包含在硅酸盐中。在棕褐色的内部，大多数磷酸盐都与结晶的Al和Fe氧化物结合。

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